| 2012-10-21 11:46:45 |
Rafał Ochmański |
bug |
|
|
added bug |
| 2012-10-21 11:47:49 |
Rafał Ochmański |
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, backlight 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 |
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 |
|
| 2012-10-21 11:49:18 |
papukaija |
tags |
regression-release |
quantal regression-release |
|
| 2012-10-21 11:51:18 |
papukaija |
affects |
xorg (Ubuntu) |
linux (Ubuntu) |
|
| 2012-10-21 11:51:18 |
papukaija |
linux (Ubuntu): status |
New |
Incomplete |
|
| 2012-10-21 11:55:40 |
Rafał Ochmański |
tags |
quantal regression-release |
apport-collected quantal regression-release running-unity |
|
| 2012-10-21 11:55:41 |
Rafał Ochmański |
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 |
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. |
|
| 2012-10-21 11:55:42 |
Rafał Ochmański |
attachment added |
|
AlsaInfo.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407347/+files/AlsaInfo.txt |
|
| 2012-10-21 11:55:43 |
Rafał Ochmański |
attachment added |
|
BootDmesg.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407348/+files/BootDmesg.txt |
|
| 2012-10-21 11:55:46 |
Rafał Ochmański |
attachment added |
|
CRDA.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407349/+files/CRDA.txt |
|
| 2012-10-21 11:55:47 |
Rafał Ochmański |
attachment added |
|
CurrentDmesg.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407350/+files/CurrentDmesg.txt |
|
| 2012-10-21 11:55:49 |
Rafał Ochmański |
attachment added |
|
IwConfig.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407351/+files/IwConfig.txt |
|
| 2012-10-21 11:55:50 |
Rafał Ochmański |
attachment added |
|
Lspci.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407352/+files/Lspci.txt |
|
| 2012-10-21 11:55:51 |
Rafał Ochmański |
attachment added |
|
Lsusb.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407353/+files/Lsusb.txt |
|
| 2012-10-21 11:55:52 |
Rafał Ochmański |
attachment added |
|
ProcCpuinfo.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407354/+files/ProcCpuinfo.txt |
|
| 2012-10-21 11:55:53 |
Rafał Ochmański |
attachment added |
|
ProcInterrupts.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407355/+files/ProcInterrupts.txt |
|
| 2012-10-21 11:55:55 |
Rafał Ochmański |
attachment added |
|
ProcModules.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407356/+files/ProcModules.txt |
|
| 2012-10-21 11:55:56 |
Rafał Ochmański |
attachment added |
|
PulseList.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407357/+files/PulseList.txt |
|
| 2012-10-21 11:55:57 |
Rafał Ochmański |
attachment added |
|
RfKill.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407358/+files/RfKill.txt |
|
| 2012-10-21 11:55:59 |
Rafał Ochmański |
attachment added |
|
UdevDb.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407359/+files/UdevDb.txt |
|
| 2012-10-21 11:56:01 |
Rafał Ochmański |
attachment added |
|
UdevLog.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407360/+files/UdevLog.txt |
|
| 2012-10-21 11:56:02 |
Rafał Ochmański |
attachment added |
|
WifiSyslog.txt https://bugs.launchpad.net/bugs/1069357/+attachment/3407361/+files/WifiSyslog.txt |
|
| 2012-10-22 17:57:59 |
Joseph Salisbury |
linux (Ubuntu): importance |
Undecided |
Medium |
|
| 2012-11-04 00:52:33 |
Rafał Ochmański |
linux (Ubuntu): status |
Incomplete |
Confirmed |
|
| 2013-04-27 13:38:27 |
Rafał Ochmański |
tags |
apport-collected quantal regression-release running-unity |
apport-collected quantal raring regression-release running-unity |
|
| 2013-06-18 20:26:45 |
Joonas Saarinen |
bug |
|
|
added subscriber Joonas Saarinen |
| 2013-08-10 23:45:57 |
penalvch |
tags |
apport-collected quantal raring regression-release running-unity |
apport-collected latest-bios-a03 needs-upstream-testing quantal raring regression-release running-unity |
|
| 2013-08-10 23:48:05 |
penalvch |
summary |
Hardware keys change backlight brightness in much larger increments/steps than expected |
[Dell Vostro V131] Hardware keys change backlight brightness in much larger increments/steps than expected |
|
| 2013-08-10 23:48:40 |
penalvch |
linux (Ubuntu): status |
Confirmed |
Incomplete |
|
| 2013-10-10 04:19:02 |
Launchpad Janitor |
linux (Ubuntu): status |
Incomplete |
Expired |
|
| 2013-11-12 13:58:40 |
Rafał Ochmański |
linux (Ubuntu): status |
Expired |
Confirmed |
|
| 2013-11-12 13:59:15 |
Rafał Ochmański |
tags |
apport-collected latest-bios-a03 needs-upstream-testing quantal raring regression-release running-unity |
apport-collected latest-bios-a03 needs-upstream-testing quantal raring regression-release running-unity saucy |
|
| 2013-11-13 13:24:21 |
penalvch |
linux (Ubuntu): importance |
Medium |
Low |
|
| 2013-11-13 13:24:21 |
penalvch |
linux (Ubuntu): status |
Confirmed |
Incomplete |
|
| 2013-12-07 11:12:26 |
jalon |
attachment added |
|
brightness_problem https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1069357/+attachment/3924735/+files/brightness_problem |
|
| 2013-12-07 11:27:36 |
jalon |
attachment added |
|
brightness_3step https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1069357/+attachment/3924736/+files/brightness_3step |
|
| 2013-12-07 12:23:23 |
penalvch |
attachment removed |
brightness_problem https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1069357/+attachment/3924735/+files/brightness_problem |
|
|
| 2013-12-07 12:23:24 |
penalvch |
attachment removed |
brightness_3step https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1069357/+attachment/3924736/+files/brightness_3step |
|
|
| 2014-02-06 04:17:31 |
Launchpad Janitor |
linux (Ubuntu): status |
Incomplete |
Expired |
|
| 2014-02-06 17:13:07 |
Rafał Ochmański |
linux (Ubuntu): status |
Expired |
Confirmed |
|
| 2014-02-14 05:57:46 |
penalvch |
linux (Ubuntu): status |
Confirmed |
Incomplete |
|
| 2014-04-16 04:17:19 |
Launchpad Janitor |
linux (Ubuntu): status |
Incomplete |
Expired |
|
