*** This bug is a duplicate of bug 1055771 ***
https://bugs.launchpad.net/bugs/1055771
Public bug reported:
After upgrading to 3.5.0-15 on Quantal my Samsung 900X4C boots with it's
display backlight off.
The backlight is turned off immediately after grub and before the kernel
messages start. The display remains off and the keyboard keys assigned
to adjust the brightness do not change the display.
The previous kernel (3.5.0-14) does not display these symptoms.
Workarounds:
1) Create a script which runs at boot time to turn the display on. I do
this by running a reboot cronjob to set the display brightness.
/etc/cron.d/fix-backlight:
@reboot root echo 2040 > /sys/class/backlight/intel_backlight/brightness
A initscript would be able to do the job as well, or better.
2) Use an earlier kernel (3.5.0-14)
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** This bug has been marked a duplicate of bug 1055771
Samsung 900X4C laptop boots with display backlight off
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https://bugs.launchpad.net/bugs/1055770
Title:
Samsung 900X4C laptop boots with display backlight off
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