https://bugzilla.kernel.org/show_bug.cgi?id=77091
Anton Gubarkov <anton.gubar...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|DUPLICATE |---
--- Comment #12 from Anton Gubarkov <anton.gubar...@gmail.com> ---
Indeed these 2 bugs have something in common. Probably even the root cause
might turn out to be common. I did study bug 76491 before opening mine and I
did try to apply some troubleshooting suggested there. However there are
several considerations that make think I observe a different bug:
1. 76491 is a regression bug. there is a kernel version known to work as
expected. Mine never worked as expected.
2. a reporter of 76491 can achieve the desired behaviour using acpi_video as
the backlight control interface. I cannot. Brightness is always brought to the
value of 3/255.
3. the worst of my troubles: sometimes the brightness is dropped to 3/255 in
the mid-air. I don't do any AC plugs/unplugs, however I see the same messages
in the log that appear when I plug/unplug AC and the brightness is dropped. The
power led flashes 3 times at the same moment like it does when I plug/unplug
AC. I never observed this when I run on battery though. This brightness drop
can haunt me 5-10 times a minute sometimes and then it can be stable for
another 30 minutes.
Based on these considerations I kindly ask you to consider re-opening this bug
as separate.
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