Public bug reported:
The problem appears in console mode only and it is that the backlight
cannot be controlled with the Fn keys. It can neither be adjusted nor
turned off.
The machine runs Ubuntu Server 12.04.1 LTS and is Samsung N220 netbook
with a sun readable PixelQi display.
uname -a :
Linux clterm 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:22 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
ls /sys/class/backlight :
intel_backlight
samsung
I have put acpi_backlight=vendor kernel parameter as setting acpi video
backlight does not have any effect.
This works ok:
echo 200 |sudo dd of=/sys/class/backlight/intel_backlight/brightness
This also works ok:
echo 4 |sudo dd of=/sys/class/backlight/samsung/brightness
The above commands work differently though. The first one allows
controlling in great ranges, while the second controls the backlight
within some bounds.
Your help is appreciated!
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: kernel-bug
** Package changed: alsa-driver (Ubuntu) => ubuntu
** Description changed:
The problem appears in console mode only and it is that the backlight
cannot be controlled with the Fn keys. It can neither be adjusted nor
turned off.
The machine runs Ubuntu Server 12.04.1 LTS and is Samsung N220 netbook
with a sun readable PixelQi display.
uname -a :
Linux clterm 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:22 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
ls /sys/class/backlight :
- intel_backlight
+ intel_backlight
samsung
I have put acpi_backlight=vendor kernel parameter as setting acpi video
backlight does not any effect.
This works ok:
echo 200 |sudo dd=of=/sys/class/backlight/intel_backlight/brightness
This also works ok:
echo 4 |sudo dd=of=/sys/class/backlight/samsung/brightness
The above commands work differently though. The first one allows
controlling in great ranges, while the second controls the backlight
within some bounds.
Your help is appreciated!
-
- Please report problems to LP: #568611. Provide your machine make/model,
- the output from "uname -a" and "ls /sys/class/backlight" along with your
- report.
** Description changed:
The problem appears in console mode only and it is that the backlight
cannot be controlled with the Fn keys. It can neither be adjusted nor
turned off.
The machine runs Ubuntu Server 12.04.1 LTS and is Samsung N220 netbook
with a sun readable PixelQi display.
uname -a :
Linux clterm 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:22 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
ls /sys/class/backlight :
intel_backlight
samsung
I have put acpi_backlight=vendor kernel parameter as setting acpi video
- backlight does not any effect.
+ backlight does not have any effect.
This works ok:
echo 200 |sudo dd=of=/sys/class/backlight/intel_backlight/brightness
This also works ok:
echo 4 |sudo dd=of=/sys/class/backlight/samsung/brightness
The above commands work differently though. The first one allows
controlling in great ranges, while the second controls the backlight
within some bounds.
Your help is appreciated!
** Description changed:
The problem appears in console mode only and it is that the backlight
cannot be controlled with the Fn keys. It can neither be adjusted nor
turned off.
The machine runs Ubuntu Server 12.04.1 LTS and is Samsung N220 netbook
with a sun readable PixelQi display.
uname -a :
Linux clterm 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:22 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
ls /sys/class/backlight :
intel_backlight
samsung
I have put acpi_backlight=vendor kernel parameter as setting acpi video
backlight does not have any effect.
This works ok:
- echo 200 |sudo dd=of=/sys/class/backlight/intel_backlight/brightness
+ echo 200 |sudo dd of=/sys/class/backlight/intel_backlight/brightness
This also works ok:
- echo 4 |sudo dd=of=/sys/class/backlight/samsung/brightness
+ echo 4 |sudo dd of=/sys/class/backlight/samsung/brightness
The above commands work differently though. The first one allows
controlling in great ranges, while the second controls the backlight
within some bounds.
Your help is appreciated!
--
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Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1092517
Title:
Cannot control backlight using the keyboard keys on Ubuntu Server
Status in Ubuntu:
New
Bug description:
The problem appears in console mode only and it is that the backlight
cannot be controlled with the Fn keys. It can neither be adjusted nor
turned off.
The machine runs Ubuntu Server 12.04.1 LTS and is Samsung N220 netbook
with a sun readable PixelQi display.
uname -a :
Linux clterm 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:22 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
ls /sys/class/backlight :
intel_backlight
samsung
I have put acpi_backlight=vendor kernel parameter as setting acpi
video backlight does not have any effect.
This works ok:
echo 200 |sudo dd of=/sys/class/backlight/intel_backlight/brightness
This also works ok:
echo 4 |sudo dd of=/sys/class/backlight/samsung/brightness
The above commands work differently though. The first one allows
controlling in great ranges, while the second controls the backlight
within some bounds.
Your help is appreciated!
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+bug/1092517/+subscriptions
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