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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - drm/amd/display: set backlight level limit to 1: breaks userspace programs assuming 0 is the minimum brightness"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108668#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - drm/amd/display: set backlight level limit to 1: breaks userspace programs assuming 0 is the minimum brightness"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108668">bug 108668</a>
from <span class="vcard"><a class="email" href="mailto:samantham@posteo.net" title="Samantha McVey <samantham@posteo.net>"> <span class="fn">Samantha McVey</span></a>
</span></b>
<pre>In addition, even though there is a write error, when you read back the
brightness value, it shows that the backlight is at level 0, while its
brightness has actually been unchanged from before:
echo 0 >
/sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/backlight/amdgpu_bl0/brightness
bash: echo: write error: Invalid argument
cat
/sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/backlight/amdgpu_bl0/brightness
0</pre>
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