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Message #26110
[Bug 1185927] Re: invalid parameter for 'backlight' message on boot
Benjamin Hilton, as per
http://www.dell.com/support/drivers/us/en/19/Product/xps-15 an update is
available for your BIOS (A08). If you update to this following
https://help.ubuntu.com/community/BiosUpdate , does it change anything?
If not, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
Please note your current BIOS is already in the Bug Description, so
posting this on the old BIOS would not be helpful.
For more on BIOS updates and linux, please see
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette
.
Thank you for your understanding.
** Description changed:
- I'm using a Dell XPS 15, 13.04, kernel version 3.8.0.22.38. In order to get my backlight brightness control to work I have to use "acpi_backlight=vendor dell_laptop.backlight=0". The brightness controls don't work properly without 'dell_laptop.backlight=0'. '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.
- It seems that I can change the '0' to anything, get the same message with the '0' changed to whatever I changed it to, and the brightness control still works (e.g. I tried changing the '0' to 'hiimbarhilton': the brightness controls still worked properly, and I still got the error message, just with 'hiimbarhilton' instead of '0'). The parameter makes the brightness work even though it seems to be invalid.
+ My backlight does not work 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.
** Tags added: bios-outdated-a08
** Tags removed: kernel-bug-exists-upstream
** Tags added: kernel-bug-exists-upstream-v3.10-rc4 needs-upstream-testing
** Changed in: linux (Ubuntu)
Status: Triaged => Incomplete
** Summary changed:
- invalid parameter for 'backlight' message on boot
+ 8086:0046 [Dell XPS 15 L501x] Unable to change backlight by default
** Description changed:
- My backlight does not work by default.
+ 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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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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