Public bug reported:
I upgraded to Kubuntu 13.04, and my brightness keys will not select the
correct interface. This worked fine in Kubuntu 12.10, if I put
"acpi_backlight=vendor" in the grub options.
Now, when /etc/default/grub contains
GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor"
/sys/class/backlight/ contains dell_backlight and intel_backlight. Pressing the
brightness keys does nothing to the display, but modifies the value in
dell_backlight/brightness . However, if I manually modify the values in
intel_backlight/brightness , the backlight changes as expected.
If I modify /etc/default/grub to contain
GRUB_CMDLINE_LINUX_DEFAULT=""
/sys/class/backlight/ now contains acpi_video0 , acpi_video1 and
intel_backlight . Now, the brightness keys do work (somewhat), and the value of
acpi_video1/brightness is modified.
However, "acpi_backlight=vendor" gives me more control over the
backlight. For example, I can reduce the backlight down to 0% and have
the screen turn off. Without this grub option, when I reduce
acpi_video1/brightness to 0 with the brightness keys, the backlight is
still on. Hence, it seems that the brightness keys should really modify
intel_backlight instead of acpi_video1.
As per [1], I'll file a bug against the kernel.
[1] http://community.kde.org/Solid/PowerDevil/Brightness
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-21-generic 3.8.0-21.32
ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8
Uname: Linux 3.8.0-21-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: lee 2407 F.... pulseaudio
CRDA:
country AU:
(2402 - 2482 @ 40), (N/A, 20)
(5170 - 5250 @ 40), (3, 23)
(5250 - 5330 @ 40), (3, 23), DFS
(5735 - 5835 @ 40), (3, 30)
Date: Sun May 19 13:59:39 2013
HibernationDevice: RESUME=UUID=a1f7da64-6043-4164-b1c4-739393bca744
InstallationDate: Installed on 2012-12-16 (153 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MachineType: Dell Inc. Dell System XPS L702X
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-21-generic
root=UUID=db0afad2-4157-4cef-adb5-4da2aa4243f0 ro
RelatedPackageVersions:
linux-restricted-modules-3.8.0-21-generic N/A
linux-backports-modules-3.8.0-21-generic N/A
linux-firmware 1.106
SourcePackage: linux
UpgradeStatus: Upgraded to raring on 2013-04-26 (22 days ago)
dmi.bios.date: 09/07/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A19
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 0XN71K
dmi.board.vendor: Dell Inc.
dmi.board.version: FAB1
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias:
dmi:bvnDellInc.:bvrA19:bd09/07/2012:svnDellInc.:pnDellSystemXPSL702X:pvr:rvnDellInc.:rn0XN71K:rvrFAB1:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System XPS L702X
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug raring
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https://bugs.launchpad.net/bugs/1181660
Title:
PowerDevil selects the incorrect brightness interface
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