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Message #35504
[Bug 1178796] Re: 8086:2a42 [Asus UL80VT] Backlight control does not work with Intel integrated card, but there are entries in /sys/class/backlight
** Also affects: linux via
http://bugzilla.kernel.org/show_bug.cgi?id=66501
Importance: Unknown
Status: Unknown
** 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
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.
+
+ WORKAROUND: specify the backlight option in xorg.conf.
+
+ Section "Device"
+ Identifier "Default Device"
+ Option "Backlight" "intel_backlight"
+ Driver "intel"
+ BusID "PCI:0:2:0"
+ EndSection
WORKAROUND: On KDE Raring Ubuntu 3.8.0-30.44-generic, bumblebee removed, BIOS SATA mode set to Compatible (this disables the Intel graphics card which does not appear anymore in lspci, http://wiki.daviddarts.com/Ubuntu_Maverick_on_the_Asus_UL30VT#Nvidia_Accelerated_Graphics_Driver), only default kernel parameters, and using either nouveau or nvidia drivers:
The plasma widget for screen brightness (inside battery monitor widget) is able to change the brightness. And automatic brightness change from KDE system (when the power adaptor is unplugged) works also. In Raring, the hotkeys do not trigger any change (see bug #1225067) but this is fixed in Saucy.
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.
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1178796
Title:
8086:2a42 [Asus UL80VT] Backlight control does not work with Intel
integrated card, but there are entries in /sys/class/backlight
Status in The Linux Kernel:
Unknown
Status in “linux” package in Ubuntu:
Triaged
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.
WORKAROUND: specify the backlight option in xorg.conf.
Section "Device"
Identifier "Default Device"
Option "Backlight" "intel_backlight"
Driver "intel"
BusID "PCI:0:2:0"
EndSection
WORKAROUND: On KDE Raring Ubuntu 3.8.0-30.44-generic, bumblebee removed, BIOS SATA mode set to Compatible (this disables the Intel graphics card which does not appear anymore in lspci, http://wiki.daviddarts.com/Ubuntu_Maverick_on_the_Asus_UL30VT#Nvidia_Accelerated_Graphics_Driver), only default kernel parameters, and using either nouveau or nvidia drivers:
The plasma widget for screen brightness (inside battery monitor widget) is able to change the brightness. And automatic brightness change from KDE system (when the power adaptor is unplugged) works also. In Raring, the hotkeys do not trigger any change (see bug #1225067) but this is fixed in Saucy.
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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