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Message #26944
[Bug 1185927] Re: 8086:0046 [Dell XPS 15 L501x] Unable to change backlight by default
Updating my BIOS did not change anything.
I have upgraded to 13.10, and now I no longer get the error message.
Instead, dell_laptop.backlight=0 does not change anything, and I am left
having to repeatedly fiddle with the keys or use "echo [brightness
value] | sudo tee /sys/class/backlight/intel_backlight/brightness" to
change the brightness.
Output of sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date:
A08
07/26/2011
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https://bugs.launchpad.net/bugs/1185927
Title:
8086:0046 [Dell XPS 15 L501x] Unable to change backlight by default
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
While I disabled my nvidia card in BIOS, I am unable to change the
backlight by default.
WORKAROUND: Use both kernel parameters:
acpi_backlight=vendor dell_laptop.backlight=0
Having just 'acpi_backlight=vendor' means that if I quickly and
repeatedly press the key to change brightness, it eventually lowers,
but sometimes the down key makes it higher and visa versa, making it
difficult to change. Adding 'dell_laptop.backlight=0' makes the
controls work perfectly normally. But when I boot, I get the message:
dell_laptop: '0' invalid parameter for 'backlight', at which my
computer then continues to boot and works normally, with the
brightness control working.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-22-generic 3.8.0-22.33
ProcVersionSignature: Ubuntu 3.8.0-22.33-generic 3.8.11
Uname: Linux 3.8.0-22-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: benjamin 4172 F.... pulseaudio
/dev/snd/controlC0: benjamin 4172 F.... pulseaudio
Date: Thu May 30 19:07:26 2013
HibernationDevice: RESUME=UUID=74004122-cb29-4972-92c0-8bd036223958
InstallationDate: Installed on 2013-04-26 (34 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Dell Inc. XPS L501X
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-22-generic root=UUID=df9e5312-fd68-4a0f-99fb-8b6667021bea ro quiet splash acpi_backlight=vendor dell_laptop.backlight=0
RelatedPackageVersions:
linux-restricted-modules-3.8.0-22-generic N/A
linux-backports-modules-3.8.0-22-generic N/A
linux-firmware 1.106
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/15/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A03
dmi.board.name: 00CKNG
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A03
dmi.modalias: dmi:bvnDellInc.:bvrA03:bd10/15/2010:svnDellInc.:pnXPSL501X:pvrA03:rvnDellInc.:rn00CKNG:rvrA03:cvnDellInc.:ct8:cvrA03:
dmi.product.name: XPS L501X
dmi.product.version: A03
dmi.sys.vendor: Dell Inc.
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