From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.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 Jul 2018 10:05:36 +0000 [thread overview]
Message-ID: <bug-106228-502-8Lvce3fHMQ@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-106228-502@http.bugs.freedesktop.org/>
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https://bugs.freedesktop.org/show_bug.cgi?id=106228
--- Comment #6 from jian-hong@endlessm.com ---
Apply "[PATCH] drm/amdgpu: Read back max backlight value at boot" to Linux
4.18.0-rc6 kernel.
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 manually
again and it reads back 255 (the maximum brightness).
If I unmask systemd-backlight service and than reboot for test, "cat
/sys/class/backlight/amdgpu_bl0/brightness" before set brightness manually
again and it reads back the brightness which is saved before last reboot.
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next prev parent reply other threads:[~2018-07-25 10:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-25 3:43 [Bug 106228] amdgpu reads back brightness 0 (which is not true) if checked before a brightness has been explicitly set bugzilla-daemon
2018-05-08 19:45 ` bugzilla-daemon
2018-05-08 21:06 ` bugzilla-daemon
2018-06-05 15:38 ` bugzilla-daemon
2018-07-23 18:32 ` bugzilla-daemon
2018-07-24 20:06 ` bugzilla-daemon
2018-07-25 10:05 ` bugzilla-daemon [this message]
2018-07-25 10:07 ` bugzilla-daemon
2018-07-25 19:26 ` bugzilla-daemon
2018-07-26 7:41 ` bugzilla-daemon
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