The fix has landed in 3.5, if you want it in 3.4 you can submit it to the stable team, reference the commit and this bug report here.
commit b03543857fd75876b96e10d4320b775e95041bb7 Author: Takashi Iwai <ti...@suse.de> Date: Tue Mar 20 13:07:05 2012 +0100 drm/i915: Check VBIOS value for determining LVDS dual channel mode, too -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/814895 Title: [snb-m-gt2] Booting with external monitor fails with *ERROR* Couldn't find PLL settings for mode! To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/814895/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs