Workround provided from upstream dialogue - Thank you Aaron. See http://marc.info/?l=linux-acpi&m=140686098023199&w=2
In summary: Switching to use the "intel-backlight" interface rather than the "acpi_video0" interface makes the controls for brightness work after suspend. This can be done by creating, or adding to, the file /etc/X11/xorg.conf with the section below: Section "Device" Identifier "Intel Graphics" Driver "intel" Option "AccelMethod" "sna" Option "Backlight" "intel_backlight" Driver "intel" BusID "PCI:0:2:0" EndSection -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1338063 Title: [Toshiba Portege Z835-ST6N03] Brightness control lost after suspend screen dimmed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1338063/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
