From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 106228] amdgpu reads back brightness 0 (which is not true) if checked before a brightness has been explicitly set Date: Wed, 25 Apr 2018 03:43:32 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0708541439==" Return-path: Received: from culpepper.freedesktop.org (culpepper.freedesktop.org [IPv6:2610:10:20:722:a800:ff:fe98:4b55]) by gabe.freedesktop.org (Postfix) with ESMTP id 9DBFF6E0F2 for ; Wed, 25 Apr 2018 03:43:32 +0000 (UTC) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============0708541439== Content-Type: multipart/alternative; boundary="15246278120.E7Ce.10510" Content-Transfer-Encoding: 7bit --15246278120.E7Ce.10510 Date: Wed, 25 Apr 2018 03:43:32 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated https://bugs.freedesktop.org/show_bug.cgi?id=3D106228 Bug ID: 106228 Summary: amdgpu reads back brightness 0 (which is not true) if checked before a brightness has been explicitly set Product: DRI Version: unspecified Hardware: Other OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: jian-hong@endlessm.com Created attachment 139091 --> https://bugs.freedesktop.org/attachment.cgi?id=3D139091&action=3Dedit The full dmesg I have tried to install Linux OS on ASUS laptop which is equipped with AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx. When the Linux installation completed and entered to the OS, the brightness= of display looks normal but the brightness bar is shown as the lowest level wi= thin the display's brightness GUI setting. Also check "cat /sys/class/backlight/amdgpu_bl0/brightness" and it is 0. After a system reboot, Brightness is dimmed to the lowest level. Check "cat /sys/class/backlight/amdgpu_bl0/brightness" again and it is 12. To make sure it is the problem that "system always reads back brightness 0 = if checked before a brightness has been explicitly set". I disable all of the brightness setting applications, including masking systemd-backlight service and than reboot. "cat /sys/class/backlight/amdgpu_bl0/brightness" before set brightness manu= ally again and it reads back 0, but the brightness of display looks normal actua= lly. Then, if I drag the brightness bar in GUI, the actual brightness changes and the "/sys/class/backlight/amdgpu_bl0/brightness" goes to the right value. And, I reboot again, then the same things happen again. I also tried this with kernel v4.17.0-rc2. It still has the same problem. --=20 You are receiving this mail because: You are the assignee for the bug.= --15246278120.E7Ce.10510 Date: Wed, 25 Apr 2018 03:43:32 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated
Bug ID 106228
Summary amdgpu reads back brightness 0 (which is not true) if checked= before a brightness has been explicitly set
Product DRI
Version unspecified
Hardware Other
OS Linux (All)
Status NEW
Severity normal
Priority medium
Component DRM/AMDgpu
Assignee dri-devel@lists.freedesktop.org
Reporter jian-hong@endlessm.com 

Created attachment 139091 [details]
The full dmesg

I have tried to install Linux OS on ASUS laptop which is equipped with AMD
Ryzen 5 2500U with Radeon Vega Mobile Gfx.

When the Linux installation completed and entered to the OS, the brightness=
 of
display looks normal but the brightness bar is shown as the lowest level wi=
thin
the display's brightness GUI setting.

Also check "cat /sys/class/backlight/amdgpu_bl0/brightness" and i=
t is 0.

After a system reboot, Brightness is dimmed to the lowest level.
Check "cat /sys/class/backlight/amdgpu_bl0/brightness" again and =
it is 12.

To make sure it is the problem that "system always reads back brightne=
ss 0 if
checked before a brightness has been explicitly set".
I disable all of the brightness setting applications, including masking
systemd-backlight service and than reboot.
"cat /sys/class/backlight/amdgpu_bl0/brightness" before set brigh=
tness manually
again and it reads back 0, but the brightness of display looks normal actua=
lly.
Then, if I drag the brightness bar in GUI, the actual brightness changes and
the "/sys/class/backlight/amdgpu_bl0/brightness" goes to the righ=
t value.
And, I reboot again, then the same things happen again.

I also tried this with kernel v4.17.0-rc2.  It still has the same problem.<=
/pre>

You are receiving this mail because:
  • You are the assignee for the bug.
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