Symptom sometimes occurs on a R700 Toshiba when returning from sleep mode. Restarting the system restores this functionality.
I am running Ubuntu 14.04 64 bit. ~$ uname -psrv Linux 3.13.0-29-generic #53-Ubuntu SMP Wed Jun 4 21:00:20 UTC 2014 x86_64 I could also adjust the brightness from the terminal: ~$ cat /sys/class/backlight/intel_backlight/brightness 1030 ~$ grep . /sys/class/backlight/intel_backlight/* /sys/class/backlight/intel_backlight/actual_brightness:1030 /sys/class/backlight/intel_backlight/bl_power:0 /sys/class/backlight/intel_backlight/brightness:1030 /sys/class/backlight/intel_backlight/max_brightness:4539 So, to temporarily increase the screen brightness: ~$ echo 3030 | sudo tee /sys/class/backlight/intel_backlight/brightness 3030 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1214148 Title: [Toshiba Portege Z935-ST4N03] Intel video: Display backlight cannot be changed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1214148/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
