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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - amdgpu reads back brightness 0 (which is not true) if checked before a brightness has been explicitly set"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106228#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - amdgpu reads back brightness 0 (which is not true) if checked before a brightness has been explicitly set"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106228">bug 106228</a>
from <span class="vcard"><a class="email" href="mailto:jian-hong@endlessm.com" title="jian-hong@endlessm.com">jian-hong@endlessm.com</a>
</span></b>
<pre>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.</pre>
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