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Message #43814
[Bug 1069357] Re: [Dell Vostro V131] Hardware keys change backlight brightness in much larger increments/steps than expected
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1069357
Title:
[Dell Vostro V131] Hardware keys change backlight brightness in much
larger increments/steps than expected
Status in “linux” package in Ubuntu:
Expired
Bug description:
SInce the upgrade to Ubuntu 12.10, hardware keys for regulating
backlight brightness (fn+f4, fn+f5) change brightness in large
increments, even though much finer control is available both through
the Brightness and Lock dialog in Settings and by just setting the
value in /sys/class/backlight/acpi_video0/brightness, for example:
# echo 1 > /sys/class/backlight/acpi_video0/brightness
/sys/class/backlight/acpi_video0/brightness accepts values 0-15, the
default step seems to be 3 instead of 1 as expected, and as it was in
Ubuntu 12.04.
Partial workaround is to disable brightness switch
# echo -n 0 > /sys/module/video/parameters/brightness_switch_enabled
which cuts the step to 2. Moreover, adding kernel parameters
"acpi_osi=Linux acpi_backlight=legacy" allows for even finer control
in the Brightness and Lock dialog in Settings (finer than those 16
settings, including completely turning the backlight via the
brightness slider) but breaks the hardware keys functionality
completely.
# lsb_release -rd
Description: Ubuntu 12.10
Release: 12.10
---
ApportVersion: 2.6.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: rmo 1897 F.... pulseaudio
DistroRelease: Ubuntu 12.10
HibernationDevice: RESUME=UUID=7c82e11d-4211-4789-90b6-7a20abd8aa82
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: Dell Inc. Vostro V131
Package: linux (not installed)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-17-generic root=/dev/mapper/ubuntu-root ro
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
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
Tags: quantal running-unity
Uname: Linux 3.5.0-17-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 10/24/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A03
dmi.board.name: 0X3GJK
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvrA03:bd10/24/2011:svnDellInc.:pnVostroV131:pvrNotSpecified:rvnDellInc.:rn0X3GJK:rvrA03:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Vostro V131
dmi.product.version: Not Specified
dmi.sys.vendor: Dell Inc.
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