Public bug reported:
Hi,
After upgrading to raring, gsd-backlight-helper seems to make a wrong
decision on which backlight to modify/the correct node is missing. The
hotkeys for changing the screen brightness don't work on Asus UX32VD.
The brightness is stuck between two values with the hotkeys (about
95% and 90%)
gsd-backlight-helper sets
/sys/devices/virtual/backlight/apple_backlight/brightness which doesn't
change anything :
# strace -e write,open /usr/lib/gnome-settings-daemon/gsd-backlight-helper
--set-brightness 10 2>&1|tail -n 2
open("/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0/brightness",
O_WRONLY) = 3
write(3, "10", 2) = 2
manually setting the brightness like this doesn't work :
# echo 5 >
/sys/devices/pci0000\:00/0000\:00\:01.0/0000\:01\:00.0/backlight/acpi_video0/brightness
setting the brightness using intel_backlight works well :
# strace -e write,open /usr/bin/intel_backlight 100 2>&1|tail -n 4
open("/sys/bus/pci/devices/0000:00:02.0/resource0", O_RDWR|O_CLOEXEC) = 4
write(1, "current backlight value: 100%\nse"..., 52current backlight value: 100%
set backlight to 100%
) = 52
manually setting the brightness like this works :
# echo 50 >
/sys/bus/pci/devices/0000\:00\:02.0/backlight/acpi_video1/brightness
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: gnome-settings-daemon 3.6.4-0ubuntu8
ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
Uname: Linux 3.8.0-16-generic x86_64
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
Date: Sun Apr 7 07:41:38 2013
InstallationDate: Installed on 2012-09-17 (201 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64+mac (20120917)
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: gnome-settings-daemon
UpgradeStatus: Upgraded to raring on 2013-04-06 (0 days ago)
** Affects: gnome-settings-daemon (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug raring
** Attachment added: "minimum brightness with hotkey"
https://bugs.launchpad.net/bugs/1165590/+attachment/3627291/+files/min_brightness_with_hotkey.png
** Description changed:
Hi,
- gsd-backlight-helper seems to make a wrong decision on which backlight
- to modify/the correct node is missing. The hotkeys for changing the
- screen brightness don't work on Asus UX32VD. The brightness is stuck
- between two values with the hotkeys (about 95% and 90%)
+ After upgrading to raring, gsd-backlight-helper seems to make a wrong
+ decision on which backlight to modify/the correct node is missing. The
+ hotkeys for changing the screen brightness don't work on Asus UX32VD.
+ The brightness is stuck between two values with the hotkeys (about
+ 95% and 90%)
gsd-backlight-helper sets
/sys/devices/virtual/backlight/apple_backlight/brightness which doesn't
change anything :
# strace -e write,open /usr/lib/gnome-settings-daemon/gsd-backlight-helper
--set-brightness 10 2>&1|tail -n 2
open("/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0/brightness",
O_WRONLY) = 3
write(3, "10", 2) = 2
manually setting the brightness like this doesn't work :
# echo 5 >
/sys/devices/pci0000\:00/0000\:00\:01.0/0000\:01\:00.0/backlight/acpi_video0/brightness
setting the brightness using intel_backlight works well :
-
+
# strace -e write,open /usr/bin/intel_backlight 100 2>&1|tail -n 4
open("/sys/bus/pci/devices/0000:00:02.0/resource0", O_RDWR|O_CLOEXEC) = 4
write(1, "current backlight value: 100%\nse"..., 52current backlight value:
100%
set backlight to 100%
) = 52
-
+
manually setting the brightness like this works :
# echo 50 >
/sys/bus/pci/devices/0000\:00\:02.0/backlight/acpi_video1/brightness
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: gnome-settings-daemon 3.6.4-0ubuntu8
ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
Uname: Linux 3.8.0-16-generic x86_64
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
Date: Sun Apr 7 07:41:38 2013
InstallationDate: Installed on 2012-09-17 (201 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64+mac (20120917)
MarkForUpload: True
ProcEnviron:
- TERM=xterm
- PATH=(custom, no user)
- XDG_RUNTIME_DIR=<set>
- LANG=en_US.UTF-8
- SHELL=/bin/bash
+ TERM=xterm
+ PATH=(custom, no user)
+ XDG_RUNTIME_DIR=<set>
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
SourcePackage: gnome-settings-daemon
UpgradeStatus: Upgraded to raring on 2013-04-06 (0 days ago)
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https://bugs.launchpad.net/bugs/1165590
Title:
Unable to adjust backlight brightness after upgrade to raring - Asus
UX32VD
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https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1165590/+subscriptions
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