1 files changed, 40 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.19.8/0767-Revert-drm-amd-display-set-backlight-level-limit-to-.patch b/common/recipes-kernel/linux/linux-yocto-4.19.8/0767-Revert-drm-amd-display-set-backlight-level-limit-to-.patch
new file mode 100644
index 00000000..8097f887
--- /dev/null
+++ b/common/recipes-kernel/linux/linux-yocto-4.19.8/0767-Revert-drm-amd-display-set-backlight-level-limit-to-.patch
@@ -0,0 +1,40 @@
+From 3cbabbaf7928478a00d200fbbd8c4bfa36c1efcd Mon Sep 17 00:00:00 2001
+From: Alex Deucher <alexander.deucher@amd.com>
+Date: Tue, 6 Nov 2018 16:06:32 -0500
+Subject: [PATCH 0767/2940] Revert "drm/amd/display: set backlight level limit
+ to 1"
+
+This reverts commit 0cafc82fae41531b0162150f9a97f2c74f97118f.
+
+This breaks some apps that assume 0 is minimum brightness.
+
+Revert for 4.20.  This is fixed properly for drm-next/4.21 in:
+"drm/amd: Don't fail on backlight = 0"
+However, that patch depends on more extensive changes to the
+backlight interface which are too invasive for -fixes.
+
+Fixes: Bugzilla: https://bugs.freedesktop.org/108668
+Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
+---
+ drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 -----
+ 1 file changed, 5 deletions(-)
+
+diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+index 4372ea9e5aaf..492793722654 100644
+--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
++++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+@@ -1579,11 +1579,6 @@ static int amdgpu_dm_backlight_update_status(struct backlight_device *bd)
+ 	 */
+ 	uint32_t brightness = bd->props.brightness * 0x101;
+ 
+-	/*
+-	 * PWM interperts 0 as 100% rather than 0% because of HW
+-	 * limitation for level 0.  So limiting minimum brightness level
+-	 * to 1.
+-	 */
+ 	if (bd->props.brightness < 1)
+ 		brightness = 0x101;
+ 
+-- 
+2.17.1
+