Public bug reported:
Following bug reporting process:
https://wiki.ubuntu.com/Kernel/Debugging/Backlight#Reporting_Backlight_Bugs
Running Ubuntu 14.04 with Unity.
Testing for a work around:
* With kernel parameter acpi_backlight=vendor
-> Brightness control is working with both applet and hotkeys.
- # echo 8 > /sys/class/backlight/intel_backlight/brightness
-> The command sets the screens brightness very low (almost turns
it off).
* With kernel parameter video.use_bios_initial_backlight=0
-> Brightness control is neither working with applet nor hotkeys.
* With kernel parameter video.use_native_backlight=1
-> Brightness control is working with both applet and hotkeys.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-30-generic 3.13.0-30.54
ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
Uname: Linux 3.13.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: florent 2107 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Jun 28 18:17:42 2014
EcryptfsInUse: Yes
HibernationDevice: RESUME=/dev/mapper/toshnux--vg-swap_1
MachineType: TOSHIBA SATELLITE Z930
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic
root=/dev/mapper/hostname--vg-root ro splash quiet acpi_backlight=vendor
vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-30-generic N/A
linux-backports-modules-3.13.0-30-generic N/A
linux-firmware 1.127.4
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/04/2013
dmi.bios.vendor: TOSHIBA
dmi.bios.version: Version 6.70
dmi.board.asset.tag: 0000000000
dmi.board.name: SATELLITE Z930
dmi.board.vendor: TOSHIBA
dmi.board.version: Version A0
dmi.chassis.asset.tag: 0000000000
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: Version 1.0
dmi.modalias:
dmi:bvnTOSHIBA:bvrVersion6.70:bd04/04/2013:svnTOSHIBA:pnSATELLITEZ930:pvrPT23LE-01900EFR:rvnTOSHIBA:rnSATELLITEZ930:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
dmi.product.name: SATELLITE Z930
dmi.product.version: PT23LE-01900EFR
dmi.sys.vendor: TOSHIBA
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug trusty
** Attachment added: "acpi"
https://bugs.launchpad.net/bugs/1335458/+attachment/4141406/+files/acpi
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https://bugs.launchpad.net/bugs/1335458
Title:
Backlight control does not work, but there are entries in
/sys/class/backlight - Toshiba Satellite Z930-164
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