From 63088da9472854408ae5d7c47bd011daf9e1a81b Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Tue, 6 Nov 2018 16:06:32 -0500 Subject: [PATCH] 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 --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 7 ------- 1 file changed, 7 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 b0df6dc9a775..e224f23e2215 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -1524,13 +1524,6 @@ static int amdgpu_dm_backlight_update_status(struct backlight_device *bd) { struct amdgpu_display_manager *dm = bl_get_data(bd); - /* - * 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) - return 1; if (dc_link_set_backlight_level(dm->backlight_link, bd->props.brightness, 0, 0)) return 0; -- 2.11.0