Attachment 140795 Details for Bug 106228 – Patch that should fix the problem

[patch] Patch that should fix the problem

0001-drm-amdgpu-Read-back-max-backlight-value-at-boot.patch (text/plain), 1.26 KB, created by David Francis on 2018-07-23 18:32:30 UTC

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Creator: David Francis

Created: 2018-07-23 18:32:30 UTC

Size: 1.26 KB

patch

obsolete

>From 8ccb541c4c241be1b32e16decf79c7d7780f326c Mon Sep 17 00:00:00 2001
>From: David Francis <David.Francis@amd.com>
>Date: Mon, 23 Jul 2018 14:29:44 -0400
>Subject: [PATCH] drm/amdgpu: Read back max backlight value at boot
>
>[Why]
>If there is no program explicitly setting the backlight
>brightness (for example, during a minimal install of linux), the
>hardware defaults to maximum brightness but the backlight_device
>defaults to 0 value.  Thus, settings displays the wrong brightness
>value.
>
>[How]
>When creating the backlight device, set brightness to max
>
>Signed-off-by: David Francis <David.Francis@amd.com>
>---
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 +
> 1 file changed, 1 insertion(+)
>
>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 952691c6f81e..5572d374a76d 100644
>--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>@@ -1331,6 +1331,7 @@ amdgpu_dm_register_backlight_device(struct amdgpu_display_manager *dm)
> 	struct backlight_properties props = { 0 };
> 
> 	props.max_brightness = AMDGPU_MAX_BL_LEVEL;
>+	props.brightness = AMDGPU_MAX_BL_LEVEL;
> 	props.type = BACKLIGHT_RAW;
> 
> 	snprintf(bl_name, sizeof(bl_name), "amdgpu_bl%d",
>-- 
>2.17.1
>

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Attachments on bug 106228: 139091 | 140795 | 140809

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