Hello all,
After going a bit grey, I found that /sys/class/backlight/toshiba breaks
after suspend, but /sys/class/backlight/intel_backlight continues to
function ('echo $number > backlight' after resume from suspend). Some
great folks over at Arch have figured this one out. I have a Toshiba
Portege R705, and this does the trick:
Source:
https://wiki.archlinux.org/index.php/Intel_Graphics#Backlight_not_fully_adjusting.2C_or_adjusting_at_all_after_resume.
Adapting this for Ubuntu 13.04:
1) sudo vi /etc/default/grub
2) change the line GRUB_CMDLINE_LINUX_DEFAULT as follows:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
3) sudo update-grub
4) Configure X11 to use the intel_backlight. Create a file called
20-intel.conf here:
sudo vi /usr/share/X11/xorg.conf.d/20-intel.conf
5) Paste in the following:
Section "Device"
Identifier "card0"
Driver "intel"
Option "Backlight" "intel_backlight"
BusID "PCI:0:2:0"
EndSection
6) Reboot and bask in glorious brightness control. Suspend/resume and
it continues to function normally from the Fn-F6/F7 keys.
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https://bugs.launchpad.net/bugs/934095
Title:
Backlight control does not work correctly on Toshiba Satellite
L750-17P.
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