This is a simple patch to fix this issue for sna / uxa mode and tested on UMA / discrete card.
** Patch added: "fix-no-backlight.patch" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1373776/+attachment/4245974/+files/fix-no-backlight.patch -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1373776 Title: internal panel brightness set to 0 when switching back to internal- only mode Status in HWE Next Project: New Status in “xserver-xorg-video-intel” package in Ubuntu: Fix Released Status in “xserver-xorg-video-intel” source package in Trusty: In Progress Bug description: [Impact] the brightness of the internal panel can get set to the lowest value when going through the display modes and back to internal-only mode this is fixed in a later upstream release, but that can't be backported so a distro patch is needed [Test case] use the laptop hotkey to switch between modes until you get a blank internal panel [Regression potential] slim, the patch is simple enough To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1373776/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp