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Message #14399
[Bug 1178796] Re: [Asus UL80VT] Backlight control does not work, but there are entries in /sys/class/backlight
Guillaume Millet, it looks like you disabled the discrete nvidia card in
BIOS in both Raring and Saucy?
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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
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
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
Raring removed my modified scripts. So, in the original description of
the bug, I thought it was a regression. But it's probably not a
regression as the brightness control has apparently never worked off-
the-shelf.
Not working neither with linux-
image-3.9.1-030901-generic_3.9.1-030901.201305080210 from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9.1-saucy/
Hotkeys are detected, showkey -s:
Fn+F5:
0xe0 0x4c 0xe0 0xcc
Fn+F6:
0xe0 0x54 0xe0 0xd4
I also attach the results from tests described on
https://wiki.ubuntu.com/Kernel/Debugging/Backlight.
Test with acpi_backlight=vendor:
- on 3.8.0-20.31-generic, no change. But echo 8 > /sys/class/backlight/intel_backlight/brightness makes the screen dark, moreover /sys/class/backlight/intel_backlight/max_brightness = 2583660
- on 3.9.1, no brightness change but the KDE notification pops up with only 3 levels (0, 53, 100%)
Test with video.use_bios_initial_backlight=0:
- on 3.8.0-20.31-generic, no change.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-20-generic 3.8.0-20.31
ProcVersionSignature: Ubuntu 3.8.0-20.31-generic 3.8.11
Uname: Linux 3.8.0-20-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: guillaume 2490 F.... pulseaudio
/dev/snd/controlC0: guillaume 2490 F.... pulseaudio
Date: Fri May 10 12:14:58 2013
HibernationDevice: RESUME=/dev/sda6
InstallationDate: Installed on 2010-01-19 (1207 days ago)
InstallationMedia: Kubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
MachineType: ASUSTeK Computer Inc. UL80VT
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-20-generic root=UUID=d92f3a31-9e9c-4c19-98be-6fbc82629a36 ro video.use_bios_initial_backlight=0 quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.8.0-20-generic N/A
linux-backports-modules-3.8.0-20-generic N/A
linux-firmware 1.106
SourcePackage: linux
UpgradeStatus: Upgraded to raring on 2013-04-27 (12 days ago)
dmi.bios.date: 01/17/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 214
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UL80VT
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr214:bd01/17/2011:svnASUSTeKComputerInc.:pnUL80VT:pvr1.0:rvnASUSTeKComputerInc.:rnUL80VT:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: UL80VT
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.
---
ApportVersion: 2.12-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ubuntu 2788 F.... pulseaudio
/dev/snd/controlC0: ubuntu 2788 F.... pulseaudio
CasperVersion: 1.336
DistroRelease: Ubuntu 13.10
LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130813)
MachineType: ASUSTeK Computer Inc. UL80VT
MarkForUpload: True
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash acpi_backlight=vendor --
ProcVersionSignature: Ubuntu 3.11.0-1.4-generic 3.11.0-rc4
RelatedPackageVersions:
linux-restricted-modules-3.11.0-1-generic N/A
linux-backports-modules-3.11.0-1-generic N/A
linux-firmware 1.113
Tags: saucy
Uname: Linux 3.11.0-1-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 01/17/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 214
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UL80VT
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr214:bd01/17/2011:svnASUSTeKComputerInc.:pnUL80VT:pvr1.0:rvnASUSTeKComputerInc.:rnUL80VT:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: UL80VT
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.
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