Public bug reported:
The brightness is locked to the brightest setting (eye-melting-bright).
I upgraded to the latest BIOS to this date : 6.70
Below are my different attempts at setting the brightness using the command
line (GUI don't work either).
GRUB_CMDLINE_LINUX=""
/sys/class/backlight/ is populated
/sys/class/backlight/acpi_video0/max_brightness:100
changing /sys/class/backlight/acpi_video0/brightness has no effect
GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
/sys/class/backlight/ is empty
GRUB_CMDLINE_LINUX="acpi_osi="
/sys/class/backlight/ is populated
/sys/class/backlight/acpi_video0/max_brightness:7
changing /sys/class/backlight/acpi_video0/brightness has no effect
GRUB_CMDLINE_LINUX="acpi_osi=\"!Windows 2012\""
/sys/class/backlight/ is populated
/sys/class/backlight/acpi_video0/max_brightness:7
changing /sys/class/backlight/acpi_video0/brightness has no effect
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-23-generic 3.8.0-23.34
ProcVersionSignature: Ubuntu 3.8.0-23.34-generic 3.8.11
Uname: Linux 3.8.0-23-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: julien 2020 F.... pulseaudio
/dev/snd/controlC0: julien 2020 F.... pulseaudio
Date: Mon Jul 8 19:12:15 2013
HibernationDevice: RESUME=UUID=26161152-fbf6-4974-b0cd-1986c7a4c449
InstallationDate: Installed on 2013-05-18 (51 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: TOSHIBA SATELLITE P855
MarkForUpload: True
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-23-generic
root=UUID=dccd4184-97e2-47cd-a183-884c6e410dec ro "acpi_osi=!Windows 2012"
quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.8.0-23-generic N/A
linux-backports-modules-3.8.0-23-generic N/A
linux-firmware 1.106
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/20/2013
dmi.bios.vendor: TOSHIBA
dmi.bios.version: 6.70
dmi.board.asset.tag: *
dmi.board.name: QFKAA
dmi.board.vendor: TOSHIBA
dmi.board.version: 1.00
dmi.chassis.asset.tag: *
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: *
dmi.modalias:
dmi:bvnTOSHIBA:bvr6.70:bd02/20/2013:svnTOSHIBA:pnSATELLITEP855:pvrPSPKBE-04C00CFR:rvnTOSHIBA:rnQFKAA:rvr1.00:cvnTOSHIBA:ct10:cvr*:
dmi.product.name: SATELLITE P855
dmi.product.version: PSPKBE-04C00CFR
dmi.sys.vendor: TOSHIBA
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug raring
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https://bugs.launchpad.net/bugs/1199062
Title:
Can't change screen brightness on Toshiba P855-30D
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