aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/video_detect.c
blob: 442396f6ed1f9c1ec3d6c920877788c014b88492 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
/*
 *  Copyright (C) 2015       Red Hat Inc.
 *                           Hans de Goede <hdegoede@redhat.com>
 *  Copyright (C) 2008       SuSE Linux Products GmbH
 *                           Thomas Renninger <trenn@suse.de>
 *
 *  May be copied or modified under the terms of the GNU General Public License
 *
 * video_detect.c:
 * After PCI devices are glued with ACPI devices
 * acpi_get_pci_dev() can be called to identify ACPI graphics
 * devices for which a real graphics card is plugged in
 *
 * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
 * are available, video.ko should be used to handle the device.
 *
 * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
 * sony_acpi,... can take care about backlight brightness.
 *
 * Backlight drivers can use acpi_video_get_backlight_type() to determine which
 * driver should handle the backlight. RAW/GPU-driver backlight drivers must
 * use the acpi_video_backlight_use_native() helper for this.
 *
 * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
 * this file will not be compiled and acpi_video_get_backlight_type() will
 * always return acpi_backlight_vendor.
 */

#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/apple-gmux.h>
#include <linux/backlight.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_data/x86/nvidia-wmi-ec-backlight.h>
#include <linux/pnp.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <acpi/video.h>

static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;

static void acpi_video_parse_cmdline(void)
{
	if (!strcmp("vendor", acpi_video_backlight_string))
		acpi_backlight_cmdline = acpi_backlight_vendor;
	if (!strcmp("video", acpi_video_backlight_string))
		acpi_backlight_cmdline = acpi_backlight_video;
	if (!strcmp("native", acpi_video_backlight_string))
		acpi_backlight_cmdline = acpi_backlight_native;
	if (!strcmp("nvidia_wmi_ec", acpi_video_backlight_string))
		acpi_backlight_cmdline = acpi_backlight_nvidia_wmi_ec;
	if (!strcmp("apple_gmux", acpi_video_backlight_string))
		acpi_backlight_cmdline = acpi_backlight_apple_gmux;
	if (!strcmp("none", acpi_video_backlight_string))
		acpi_backlight_cmdline = acpi_backlight_none;
}

static acpi_status
find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
	long *cap = context;
	struct pci_dev *dev;

	static const struct acpi_device_id video_ids[] = {
		{ACPI_VIDEO_HID, 0},
		{"", 0},
	};

	if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
		dev = acpi_get_pci_dev(handle);
		if (!dev)
			return AE_OK;
		pci_dev_put(dev);
		*cap |= acpi_is_video_device(handle);
	}
	return AE_OK;
}

/* This depends on ACPI_WMI which is X86 only */
#ifdef CONFIG_X86
static bool nvidia_wmi_ec_supported(void)
{
	struct wmi_brightness_args args = {
		.mode = WMI_BRIGHTNESS_MODE_GET,
		.val = 0,
		.ret = 0,
	};
	struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
	acpi_status status;

	status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
				     WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
	if (ACPI_FAILURE(status))
		return false;

	/*
	 * If brightness is handled by the EC then nvidia-wmi-ec-backlight
	 * should be used, else the GPU driver(s) should be used.
	 */
	return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
}
#else
static bool nvidia_wmi_ec_supported(void)
{
	return false;
}
#endif

/* Force to use vendor driver when the ACPI device is known to be
 * buggy */
static int video_detect_force_vendor(const struct dmi_system_id *d)
{
	acpi_backlight_dmi = acpi_backlight_vendor;
	return 0;
}

static int video_detect_force_video(const struct dmi_system_id *d)
{
	acpi_backlight_dmi = acpi_backlight_video;
	return 0;
}

static int video_detect_force_native(const struct dmi_system_id *d)
{
	acpi_backlight_dmi = acpi_backlight_native;
	return 0;
}

static const struct dmi_system_id video_detect_dmi_table[] = {
	/*
	 * Models which should use the vendor backlight interface,
	 * because of broken ACPI video backlight control.
	 */
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
	 .callback = video_detect_force_vendor,
	 /* Acer KAV80 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
		},
	},
	{
	 .callback = video_detect_force_vendor,
	 /* Asus UL30VT */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
		},
	},
	{
	 .callback = video_detect_force_vendor,
	 /* Asus UL30A */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
		},
	},
	{
	 .callback = video_detect_force_vendor,
	 /* Asus X55U */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
		DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
		},
	},
	{
	 /* https://bugs.launchpad.net/bugs/1000146 */
	 .callback = video_detect_force_vendor,
	 /* Asus X101CH */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
		DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
		},
	},
	{
	 .callback = video_detect_force_vendor,
	 /* Asus X401U */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
		DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
		},
	},
	{
	 .callback = video_detect_force_vendor,
	 /* Asus X501U */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
		DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
		},
	},
	{
	 /* https://bugs.launchpad.net/bugs/1000146 */
	 .callback = video_detect_force_vendor,
	 /* Asus 1015CX */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
		DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
		},
	},
	{
	 .callback = video_detect_force_vendor,
	 /* Samsung N150/N210/N220 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
		DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
		},
	},
	{
	 .callback = video_detect_force_vendor,
	 /* Samsung NF110/NF210/NF310 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
		DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
		},
	},
	{
	 .callback = video_detect_force_vendor,
	 /* Samsung NC210 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
		DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
		},
	},
	{
	 .callback = video_detect_force_vendor,
	 /* Xiaomi Mi Pad 2 */
	 .matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
		},
	},

	/*
	 * Models which should use the vendor backlight interface,
	 * because of broken native backlight control.
	 */
	{
	 .callback = video_detect_force_vendor,
	 /* Sony Vaio PCG-FRV35 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
		DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
		},
	},

	/*
	 * Toshiba models with Transflective display, these need to use
	 * the toshiba_acpi vendor driver for proper Transflective handling.
	 */
	{
	 .callback = video_detect_force_vendor,
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
		},
	},
	{
	 .callback = video_detect_force_vendor,
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
		},
	},

	/*
	 * Models which need acpi_video backlight control where the GPU drivers
	 * do not call acpi_video_register_backlight() because no internal panel
	 * is detected. Typically these are all-in-ones (monitors with builtin
	 * PC) where the panel connection shows up as regular DP instead of eDP.
	 */
	{
	 .callback = video_detect_force_video,
	 /* Apple iMac14,1 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
		},
	},
	{
	 .callback = video_detect_force_video,
	 /* Apple iMac14,2 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
		},
	},

	/*
	 * These models have a working acpi_video backlight control, and using
	 * native backlight causes a regression where backlight does not work
	 * when userspace is not handling brightness key events. Disable
	 * native_backlight on these to fix this:
	 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
	 */
	{
	 .callback = video_detect_force_video,
	 /* ThinkPad T420 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
		},
	},
	{
	 .callback = video_detect_force_video,
	 /* ThinkPad T520 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
		},
	},
	{
	 .callback = video_detect_force_video,
	 /* ThinkPad X201s */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
		},
	},
	{
	 .callback = video_detect_force_video,
	 /* ThinkPad X201T */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
		},
	},

	/* The native backlight controls do not work on some older machines */
	{
	 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
	 .callback = video_detect_force_video,
	 /* HP ENVY 15 Notebook */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
		DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
		},
	},
	{
	 .callback = video_detect_force_video,
	 /* SAMSUNG 870Z5E/880Z5E/680Z5E */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
		},
	},
	{
	 .callback = video_detect_force_video,
	 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME,
			  "370R4E/370R4V/370R5E/3570RE/370R5V"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
	 .callback = video_detect_force_video,
	 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME,
			  "3570R/370R/470R/450R/510R/4450RV"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
	 .callback = video_detect_force_video,
	 /* SAMSUNG 670Z5E */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
	 .callback = video_detect_force_video,
	 /* SAMSUNG 730U3E/740U3E */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
		},
	},
	{
	 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
	 .callback = video_detect_force_video,
	 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME,
			  "900X3C/900X3D/900X3E/900X4C/900X4D"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
	 .callback = video_detect_force_video,
	 /* Dell XPS14 L421X */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
	 .callback = video_detect_force_video,
	 /* Dell XPS15 L521X */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
		},
	},
	{
	 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
	 .callback = video_detect_force_video,
	 /* SAMSUNG 530U4E/540U4E */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
		},
	},
	{
	 /* https://bugs.launchpad.net/bugs/1894667 */
	 .callback = video_detect_force_video,
	 /* HP 635 Notebook */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
		DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
		},
	},

	/* Non win8 machines which need native backlight nevertheless */
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
	 .callback = video_detect_force_native,
	 /* Lenovo Ideapad S405 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
		},
	},
	{
	 /* https://bugzilla.suse.com/show_bug.cgi?id=1208724 */
	 .callback = video_detect_force_native,
	 /* Lenovo Ideapad Z470 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_VERSION, "IdeaPad Z470"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
	 .callback = video_detect_force_native,
	 /* Lenovo Ideapad Z570 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Lenovo E41-25 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Lenovo E41-45 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Lenovo ThinkPad X131e (3371 AMD version) */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_NAME, "3371"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Apple iMac11,3 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "iMac11,3"),
		},
	},
	{
	 /* https://gitlab.freedesktop.org/drm/amd/-/issues/1838 */
	 .callback = video_detect_force_native,
	 /* Apple iMac12,1 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,1"),
		},
	},
	{
	 /* https://gitlab.freedesktop.org/drm/amd/-/issues/2753 */
	 .callback = video_detect_force_native,
	 /* Apple iMac12,2 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,2"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
	 .callback = video_detect_force_native,
	 /* Apple MacBook Pro 12,1 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Dell Inspiron N4010 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Dell Vostro V131 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
	 .callback = video_detect_force_native,
	 /* Dell XPS 17 L702X */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Dell Precision 7510 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Dell Studio 1569 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1569"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Acer Aspire 3830TG */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Acer Aspire 4810T */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Acer Aspire 5738z */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
		DMI_MATCH(DMI_BOARD_NAME, "JV50"),
		},
	},
	{
	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
	 .callback = video_detect_force_native,
	 /* Acer Aspire 5741 */
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
		},
	},
	{
	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
	 .callback = video_detect_force_native,
	 /* Acer Aspire 5750 */
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
		},
	},
	{
	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
	 .callback = video_detect_force_native,
	 /* Acer Extensa 5235 */
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Acer TravelMate 4750 */
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
		},
	},
	{
	 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
	 .callback = video_detect_force_native,
	 /* Acer TravelMate 5735Z */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
		DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
		},
	},
	{
	 /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
	 .callback = video_detect_force_native,
	 /* Acer TravelMate 5760 */
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* ASUSTeK COMPUTER INC. GA401 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
		DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* ASUSTeK COMPUTER INC. GA502 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
		DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* ASUSTeK COMPUTER INC. GA503 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
		DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Asus U46E */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Asus UX303UB */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
		DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* HP EliteBook 8460p */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
		DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* HP Pavilion g6-1d80nr / B4U19UA */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
		DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
		DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Samsung N150P */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
		DMI_MATCH(DMI_BOARD_NAME, "N150P"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Samsung N145P/N250P/N260P */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
		DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Samsung N250P */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
		DMI_MATCH(DMI_BOARD_NAME, "N250P"),
		},
	},
	{
	 /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
	 .callback = video_detect_force_native,
	 /* Sony Vaio VPCEH3U1E */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Sony Vaio VPCY11S1E */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
		DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
		},
	},

	/*
	 * These Toshibas have a broken acpi-video interface for brightness
	 * control. They also have an issue where the panel is off after
	 * suspend until a special firmware call is made to turn it back
	 * on. This is handled by the toshiba_acpi kernel module, so that
	 * module must be enabled for these models to work correctly.
	 */
	{
	 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
	 .callback = video_detect_force_native,
	 /* Toshiba Portégé R700 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
		},
	},
	{
	 /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
	 /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
	 .callback = video_detect_force_native,
	 /* Toshiba Satellite/Portégé R830 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
		DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 /* Toshiba Satellite/Portégé Z830 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
		},
	},

	/*
	 * Models which have nvidia-ec-wmi support, but should not use it.
	 * Note this indicates a likely firmware bug on these models and should
	 * be revisited if/when Linux gets support for dynamic mux mode.
	 */
	{
	 .callback = video_detect_force_native,
	 /* Dell G15 5515 */
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
		},
	},
	{
	 .callback = video_detect_force_native,
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
		},
	},
	{ },
};

static bool google_cros_ec_present(void)
{
	return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
}

/*
 * Windows 8 and newer no longer use the ACPI video interface, so it often
 * does not work. So on win8+ systems prefer native brightness control.
 * Chromebooks should always prefer native backlight control.
 */
static bool prefer_native_over_acpi_video(void)
{
	return acpi_osi_is_win8() || google_cros_ec_present();
}

/*
 * Determine which type of backlight interface to use on this system,
 * First check cmdline, then dmi quirks, then do autodetect.
 */
enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
{
	static DEFINE_MUTEX(init_mutex);
	static bool nvidia_wmi_ec_present;
	static bool apple_gmux_present;
	static bool native_available;
	static bool init_done;
	static long video_caps;

	/* Parse cmdline, dmi and acpi only once */
	mutex_lock(&init_mutex);
	if (!init_done) {
		acpi_video_parse_cmdline();
		dmi_check_system(video_detect_dmi_table);
		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
				    ACPI_UINT32_MAX, find_video, NULL,
				    &video_caps, NULL);
		nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
		apple_gmux_present = apple_gmux_detect(NULL, NULL);
		init_done = true;
	}
	if (native)
		native_available = true;
	mutex_unlock(&init_mutex);

	if (auto_detect)
		*auto_detect = false;

	/*
	 * The below heuristics / detection steps are in order of descending
	 * presedence. The commandline takes presedence over anything else.
	 */
	if (acpi_backlight_cmdline != acpi_backlight_undef)
		return acpi_backlight_cmdline;

	/* DMI quirks override any autodetection. */
	if (acpi_backlight_dmi != acpi_backlight_undef)
		return acpi_backlight_dmi;

	if (auto_detect)
		*auto_detect = true;

	/* Special cases such as nvidia_wmi_ec and apple gmux. */
	if (nvidia_wmi_ec_present)
		return acpi_backlight_nvidia_wmi_ec;

	if (apple_gmux_present)
		return acpi_backlight_apple_gmux;

	/* Use ACPI video if available, except when native should be preferred. */
	if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
	     !(native_available && prefer_native_over_acpi_video()))
		return acpi_backlight_video;

	/* Use native if available */
	if (native_available)
		return acpi_backlight_native;

	/*
	 * The vendor specific BIOS interfaces are only necessary for
	 * laptops from before ~2008.
	 *
	 * For laptops from ~2008 till ~2023 this point is never reached
	 * because on those (video_caps & ACPI_VIDEO_BACKLIGHT) above is true.
	 *
	 * Laptops from after ~2023 no longer support ACPI_VIDEO_BACKLIGHT,
	 * if this point is reached on those, this likely means that
	 * the GPU kms driver which sets native_available has not loaded yet.
	 *
	 * Returning acpi_backlight_vendor in this case is known to sometimes
	 * cause a non working vendor specific /sys/class/backlight device to
	 * get registered.
	 *
	 * Return acpi_backlight_none on laptops with ACPI tables written
	 * for Windows 8 (laptops from after ~2012) to avoid this problem.
	 */
	if (acpi_osi_is_win8())
		return acpi_backlight_none;

	/* No ACPI video/native (old hw), use vendor specific fw methods. */
	return acpi_backlight_vendor;
}
EXPORT_SYMBOL(__acpi_video_get_backlight_type);