The discussion continues on
https://bugzilla.kernel.org/show_bug.cgi?id=66501
** Bug watch added: Linux Kernel Bug Tracker #66501
http://bugzilla.kernel.org/show_bug.cgi?id=66501
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issue reported upstream on linux-acpi mailing list:
http://marc.info/?t=13860036283r=1w=2
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https://bugs.launchpad.net/bugs/1178796
Title:
8086:2a42 [Asus UL80VT]
Here is a workaround from Aaron Lu on linux-acpi: specify the backlight
option in xorg.conf.
Section Device
Identifier Default Device
Option Backlightintel_backlight
Driver intel
BusID PCI:0:2:0
EndSection
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v3.12.1 tested, as well as v3.13-rc2; bug still present.
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https://bugs.launchpad.net/bugs/1178796
Title:
8086:2a42 [Asus UL80VT] Backlight control does not work with Intel
Tested with 3.12-saucy, same as in my last message.
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https://bugs.launchpad.net/bugs/1178796
Title:
8086:2a42 [Asus UL80VT] Backlight control does not work with Intel
Tested Live Lucid
http://old-releases.ubuntu.com/releases/lucid/ubuntu-10.04.4-desktop-amd64.iso.
Result: same as in Precise, that is, the screen brightness applet reacts to the
hotkeys but the screen brigthness does not change.
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It is the same with nouveau: hotkeys works with kernel v3.11 but not kernel
v3.8 (both tested on Raring distribution).
So the title may be modified as With Nvidia or nouveau drivers...
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In my case, the purpose of this bug report was for public notification. I
don't need a backport.
It can be closed, but it don't see why as Status Invalid, I would rather close
it as Won't Fix (before Raring) or Fix commited (in Saucy).
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** Description changed:
It used to work with the workaround suggested at
http://wiki.daviddarts.com/Ubuntu_Maverick_on_the_Asus_UL30VT#Screen_Brightness
which modifies asus-brn-down.sh to use the setpci method.
But I had forgotten that workaround and I suspect that upgrading to
** Changed in: linux (Ubuntu)
Status: Invalid = Fix Released
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https://bugs.launchpad.net/bugs/1225067
Title:
10de:0a74 [Asus UL80VT] With Nvidia drivers or nouveau
Christopher, I am not sure to understand your question. Did you mean,
did the problem appear before Raring if the setpci method was not used?
yes, for example, in 12.04 (comment #46).
I didn't try to disable the Intel card in a release prior to Raring, I
suppose that situation would be similar as
The bug existed on Maverick, as noticied on
http://wiki.daviddarts.com/Ubuntu_Maverick_on_the_Asus_UL30VT#Screen_Brightness.
However, today, Precise is the last release still supported on Desktop. I have
not tested any other release.
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With Live Saucy, I could not success in switching from nouveau to the
nvidia driver without rebooting. By default, nouveau driver in Saucy
works with the nvidia G210M in this setup and the hotkeys for screen
brightness control work too (as well as the control itself).
I could not try the nvidia
Filed as Bug #1225067.
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https://bugs.launchpad.net/bugs/1178796
Title:
[Asus UL80VT] Backlight control does not work, but there are entries
in /sys/class/backlight
** Attachment added: lsinput.log
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1225067/+attachment/3819591/+files/lsinput.log
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** Attachment added: xkbcomp.txt
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1225067/+attachment/3819592/+files/xkbcomp.txt
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** Attachment added: xkbmap.txt
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1225067/+attachment/3819593/+files/xkbmap.txt
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Public bug reported:
With the particular setup where only the nvidia graphics card is used
(the BIOS parameter SATA is switched from Enhanced to Compatible,
http://wiki.daviddarts.com/Ubuntu_Maverick_on_the_Asus_UL30VT#Nvidia_Accelerated_Graphics_Driver),
the hotkeys Fn+F5 and Fn+F6 do not
I had to install nvidia-319-updates instead of 313 to get the module compiled
for the v3.11 kernel. On v3.8 and nvidia-319-updates, the bug still exists.
With v3.11, the hotkeys trigger the KDE brightness popup and change the screen
brightness, so the bug is fixed upstream.
** Tags added:
Just to correct my comment #54:
-nouveau
+i915
The goal is to fix i915 not adjusting brightness correctly.
Ideally, the nvidia card is enabled only when necessary, using either
nouveau or nvidia driver, thanks to Bumblebee (which, for Saucy and
newer, is provided by a supported Ubuntu
On my Raring, KDE, Ubuntu 3.8.0-30.44-generic, bumblebee removed, BIOS SATA
Compatible (to allow nvidia drivers to work,
http://wiki.daviddarts.com/Ubuntu_Maverick_on_the_Asus_UL30VT#Nvidia_Accelerated_Graphics_Driver,
note that that also disables the intel card which does not appear anymore in
Hi Christopher, I have tried ubuntu-12.04.2-desktop-amd64.iso and
ubuntu-12.04-desktop-amd64.iso: the brightness applet reacts to the
hotkeys but the brigthness of the screen does not change.
I thought it was working before 13.04 but I don't remember whether I
tweaked something. Maybe I added
I probably had tweaked my acpi script according to the information given
at
http://wiki.daviddarts.com/Ubuntu_Maverick_on_the_Asus_UL30VT#Screen_Brightness
which suggests to use setpci. And probably, the modified scripts
/etc/acpi/asus-brn-down.sh (and -up) were deleted during the upgrade to
I have updated the description according to my last message. I think the
bug is not a regression and it has never worked directly. It would be
nice to fix it after 3 years of existence.
** Description changed:
- Not working since the upgrade to Raring. Used to work on 12.10.
+ It used to work
** Tags removed: precise
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Title:
[Asus UL80VT] Backlight control does not work, but there are entries
in /sys/class/backlight
The discrete nvidia card is not disabled in BIOS. In the first lspci.txt
attached (Raring), the discrete card was disabled by the module bbswitch
(https://github.com/Bumblebee-Project/Bumblebee/wiki/Power-Management).
In the second lspci.txt attached (Live Saucy), the discrete card was not
Was the report useful? or are other specific tests required?
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Title:
[Asus UL80VT] Backlight control does not work, but there are
apport information
** Tags added: apport-collected saucy
** Description changed:
Not working since the upgrade to Raring. Used to work on 12.10.
Not working neither with linux-
image-3.9.1-030901-generic_3.9.1-030901.201305080210 from
apport information
** Attachment added: ProcInterrupts.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772776/+files/ProcInterrupts.txt
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apport information
** Attachment added: CurrentDmesg.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772770/+files/CurrentDmesg.txt
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apport information
** Attachment added: Lspci.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772772/+files/Lspci.txt
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apport information
** Attachment added: BootDmesg.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772768/+files/BootDmesg.txt
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apport information
** Attachment added: ProcModules.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772777/+files/ProcModules.txt
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apport information
** Attachment added: Lsusb.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772773/+files/Lsusb.txt
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apport information
** Attachment added: CRDA.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772769/+files/CRDA.txt
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apport information
** Attachment added: WifiSyslog.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772782/+files/WifiSyslog.txt
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apport information
** Attachment added: ProcCpuinfo.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772774/+files/ProcCpuinfo.txt
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apport information
** Attachment added: ProcEnviron.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772775/+files/ProcEnviron.txt
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apport information
** Attachment added: RfKill.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772779/+files/RfKill.txt
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apport information
** Attachment added: PulseList.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772778/+files/PulseList.txt
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apport information
** Attachment added: UdevDb.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772780/+files/UdevDb.txt
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apport information
** Attachment added: UdevLog.txt
https://bugs.launchpad.net/bugs/1178796/+attachment/3772781/+files/UdevLog.txt
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I also tried the daily release without acpi_backlight=vendor, but backlight
control did not work.
The brightness applet reacts to the hotkeys, but the brigthness of the screen
does not change.
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Well, I'm lost. It seems not related to linux-image, as the kernel image
3.5.0-17.28 (quantal release) does not work either. So it may come from
another package update, acpi-support?
other notes:
- sudo setpci -s 00:02.0 F4.B=HH with HH between 0 and ff works.
- echo 258366
v3.11-rc2 tested, no change.
dmesg files without (dmesg.0) and with acpi_backlight=vendor
(dmesg_acpi_backlight_vendor.1) are attached.
** Attachment added: dmesg.0.tar.gz
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1178796/+attachment/3757383/+files/dmesg.0.tar.gz
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v3.11-rc1 tested, no change.
my BIOS is already ver. 214. On v3.11-rc1, key events are detected (KDE
popup) but the brightness does not change.
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