** Tags removed: regression
** Tags added: latest-bios-210 regression-release
** Description changed:
- Laptop: ASUS A54C-NB91 with BIOS version 210
+ Laptop: ASUS A54C-NB91 with BIOS version 210 After the 3.6 kernel
+ controlling the backlight via software (like xbacklight and the
+ brightness
I don't think the kernel is related, because I tested with kernel
3.5(it worked well with Ubuntu 12.10, with acpi_backlight=vendor) and
had the same problem. I'm using 13.04 and Acer Aspire 4332. If I do
sudo su and echo (brightness value)
/sys/class/backlight/intel_backlight/brightness in the
This is related to the kernel interracting with the bios that caters to
windows 8
this issued shows up after a bios update i was able to get software to control
the backlight properly on the 3.6.11 kernel, but not on anything newer than that
see the upstream bug report for more info
i never
confirmed in 3.9.0-030900rc5-generic
confirmed in 3.9.0-030900rc6-generic
The kernel boot parameter acpi_osi=!Windows 2012 eliminates the regression
example usage in /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT='quiet splash acpi_osi=!Windows 2012'
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** Changed in: linux
Status: Confirmed = Incomplete
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https://bugs.launchpad.net/bugs/1138168
Title:
Backlight control regression
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** Also affects: linux via
http://bugzilla.kernel.org/show_bug.cgi?id=55161
Importance: Unknown
Status: Unknown
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https://bugs.launchpad.net/bugs/1138168
Title:
Backlight
** Changed in: linux
Status: Unknown = Confirmed
** Changed in: linux
Importance: Unknown = Medium
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Title:
Backlight control
confirmed in 3.9.0-030900rc4-generic
confirmed in 3.8.4-030804-generic
confirmed in 3.8.0-14-generic
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Title:
Backlight control regression
To
Confirmed in 3.9.0-030900rc3-generic
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Title:
Backlight control regression
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Confirmed in 3.8.3-030803-generic
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Title:
Backlight control regression
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I made a recording of the issue, sorry my webcam sucks, i was not able
to get vlc to flip the video playback from the webcam to compensate for
the mirror, but its only purpose was showing the backlight response
** Attachment added: Recording of bug
reported upstream (hopefully i did it right)
https://bugzilla.kernel.org/show_bug.cgi?id=55161
** Bug watch added: Linux Kernel Bug Tracker #55161
http://bugzilla.kernel.org/show_bug.cgi?id=55161
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Confirmed in 3.9.0-030900rc2-generic
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Title:
Backlight control regression
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Confirmed in 3.8.0-12-generic
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Title:
Backlight control regression
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This issue appears to be an upstream bug, since you tested the latest
upstream kernel. Would it be possible for you to open an upstream bug
report[0]? That will allow the upstream Developers to examine the
issue, and may provide a quicker resolution to the bug.
Please follow the instructions on
ok i am confused where do i send the email to?
should i attached the output of the command as files?
can i use thunderbird to send it with it set to send in html and plain text?
** Attachment added: thunderbird send option
Confirmed in 3.8.0-11-generic
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Title:
Backlight control regression
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confirmed in 3.9.0-030900rc1-generic
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Title:
Backlight control regression
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This test was done on 3.9.0-030900rc1-generic
if it matters any value from 0 (completely off) to 4882 (100%) works for this,
increments of 2 have a effect
echo 100 | sudo tee /sys/class/backlight/intel_backlight/brightness
it is like god mode for the back light level
the lowest the fn+brightness
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.8 kernel[0] (Not a kernel in the daily directory) and install both
the linux-image and linux-image-extra .deb packages.
If this bug is fixed in the
for the record it is not fixed in 3.8.2, probably should have mentioned that
instead of filling your in boxes with emails
for reference:
http://ubuntuforums.org/showthread.php?t=2122160
sorry about the 2 for 1 email
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RC1 is still missing 3 of the 4 debs, i don't think it would be possible till
the other 3 are there
i have tested this one, if that matters
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.8.2-raring/
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** Tags added: kernel-bug-exists-upstream
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Title:
Backlight control regression
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also effects 3.8.0.10 if that matters
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Title:
Backlight control regression
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