linux-kernel - [amdgpu] backlight mismatch

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Date:   Mon, 23 Sep 2019 22:34:46 +0200
From:   Gabriel C <nix.or.die@...il.com>
To:     amd-gfx@...ts.freedesktop.org
Cc:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [amdgpu] backlight mismatch

Hello,

on my new Acer Nitro 5 (AN515-43-R8BF) backlight and actual_backlight value
in sysfs mismatch. When backlight is 0 actual_backlight is still 5140.

root@...ro5:/sys/class/backlight/amdgpu_bl1# cat brightness
255
root@...ro5:/sys/class/backlight/amdgpu_bl1# cat actual_brightness
65535
root@...ro5:/sys/class/backlight/amdgpu_bl1# echo 0 >brightness
root@...ro5:/sys/class/backlight/amdgpu_bl1# cat actual_brightness
5140

The laptop has a hybrid setup Picasso+Polaris11.

01:00.0 Display controller [0380]: Advanced Micro Devices, Inc.
[AMD/ATI] Baffin [Radeon RX 460/560D / Pro
450/455/460/555/555X/560/560X] [1002:67ef] (rev c0)
05:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Picasso [1002:15d8] (rev c1)

[    4.594694] [drm] initializing kernel modesetting (POLARIS11
0x1002:0x67EF 0x1025:0x1367 0xC0).
[    4.866696] [drm] initializing kernel modesetting (RAVEN
0x1002:0x15D8 0x1025:0x1366 0xC1).

Please let me know what other informations you may need.

Best Regards,

Gabriel C.