It's hard to tell much from your ACPI tables, essentially they just seem to be handing everything off to the embedded controller. We'll have to experiment a little.
If you look in /sys/class/backlight you'll have a directory for each of the backlight interfaces available on your system. You should see at minimum one named acpi_video0, and probably another one named toshiba. In each directory there will be files named brightness and max_brightness, among others. The allowed range of brightness values are 0 to max_brightness, and you can change the brightness by writing one of these values to the brightness file (as root). Can you tell me what interfaces you see in /sys/class/backlight, and try writing values to the brightness file to see which of them work after a fresh boot (i.e. without any suspend/resume)? Then do a suspend resume and test them again. Let me know which of them work before the suspend and whether or not any of them work after the suspend. Thanks! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/935778 Title: Toshiba R840 - brightness controls work on first boot, but do nothing after suspend/resume To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/935778/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
