I have the same problem. One thing I've noticed is that opening the GUI in Settings > Brightness and setting Brightness to 100% changes the files /sys/class/backlight/acpi_video0/brightness and /sys/class/backlight/acpi_video0/actual_brightness, adding the value "15" (in my system).
This does nothing with brigthness. But in my directory /sys/class/backlight/ there is another directory, called "intell_backlight", with the same files. I've changed the "brightness" file inside this directory and it changes the brightness of the screen. My Solution is: cat /sys/class/backlight/intel_backlight/max_brightness > /sys/class/backlight/intel_backlight/brightness This restores the brightness to 100%. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1298578 Title: Brightness is low after resume from suspend, can't be increased To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1298578/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
