http://bugzilla.kernel.org/show_bug.cgi?id=14432
Summary: backlight controls gone mad
Product: ACPI
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: acpi_power-vi...@kernel-bugs.osdl.org
ReportedBy: vudu.cu...@gmail.com
Regression: Yes
Hello,
I'm using ArchLinux (here's the "downstream" bug report:
http://bugs.archlinux.org/task/16698) and with the last update to
kernel 2.6.31.4 my backlight/brightness controls have gone mad.
My laptop's screen keeps blinking, slowly increasing or decreasing its
luminosity randomly. Sometimes it stays still for a couple of minutes
at any random brightness level, but it's very uncomfortable for the
eyes when it's blinking.
Here's a video of what's happening:
http://www.mediafire.com/download.php?z4mi4uzidjn
I've tried to use /proc/acpi/video/VGA/LCDD/brightness and
/sys/class/backlight/acpi_video0/brightness but with no luck, because
they make no changes and when I cat them I get wrong values.
I tried using xbacklight but it gives me "No outputs have backlight property".
With the previous (2.6.30.6) version I had no problems and after
getting this problem I installed Arch's "kernel26-lts" package
(2.6.27.37) and I'm having no issues with that kernel.
My laptop is an ASUS M51VA with an Intel C2D and an ATI HD 3650. I
tried fglrx, radeon and radeonhd and it made no difference.
Another smaller issue, I dunno if its distro-specific but starting some months
ago, the backlight gets pretty dim during the boot (maybe around udev loading,
before the daemons start) and I had to add a couple of commands to my rc.local
to put it back to the max brightness levels. That happens both with AC and DC.
If you need more details, please say so.
Best Regards.
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