Public bug reported:
Neither the function keys nor the system settings adjust or modify the
value of the screen brightness. The applet does appear to change, but
the actual brightness does not change. Directly writing to
/sys/class/backlight/acpi_video0/brightness does not do anything.
Model: Toshiba Satellite C855D
Video Card: AMD Radeon HD 7520G (X.Org X server display driver)
Processor: AMD A6-4400M APU (64-bit)
OS: Ubuntu 12.10
Kernel parameter acpi_backlight=vendor does not fix issue
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-17-generic 3.5.0-17.28
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: corey 1924 F.... pulseaudio
/dev/snd/pcmC1D0p: corey 1924 F...m pulseaudio
/dev/snd/controlC0: corey 1924 F.... pulseaudio
CRDA:
country EC:
(2402 - 2482 @ 40), (N/A, 20)
(5170 - 5250 @ 20), (3, 17)
(5250 - 5330 @ 20), (3, 23), DFS
(5735 - 5835 @ 20), (3, 30)
Date: Fri Feb 8 20:33:37 2013
HibernationDevice: RESUME=UUID=c3ab1a20-57ce-4d15-990c-db0be50ccfc1
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: TOSHIBA Satellite C855D
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-17-generic
root=UUID=8182a94c-bc60-427c-8515-8f4cfce63040 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.5.0-17-generic N/A
linux-backports-modules-3.5.0-17-generic N/A
linux-firmware 1.95
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/14/2012
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: 6.10
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: MP
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: OEM Chassis Manufacturer
dmi.chassis.version: OEM Chassis Version
dmi.modalias:
dmi:bvnInsydeCorp.:bvr6.10:bd09/14/2012:svnTOSHIBA:pnSatelliteC855D:pvrPSCBUU-002008:rvnTOSHIBA:rnPortablePC:rvrMP:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
dmi.product.name: Satellite C855D
dmi.product.version: PSCBUU-002008
dmi.sys.vendor: TOSHIBA
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal running-unity staging
** Attachment added: "debug report.zip"
https://bugs.launchpad.net/bugs/1119957/+attachment/3521589/+files/debug%20report.zip
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https://bugs.launchpad.net/bugs/1119957
Title:
Backlight control does not work, but there are entries in
/sys/class/backlight
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