Looks like there is still a mux involved - a hardware switch between the GPUs and the screen. That is preventing the igfx from detecting any connectors, and from there it looks like things go south. (But as far as I am aware, that should not actually prevent the driver from being loaded - since there are configurations where we support no connectors.)
-- 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/1190806 Title: X server fails to start on MacBookPro9,1 with hybrid Intel/Nvidia graphics: no screens found Status in “xserver-xorg-video-intel” package in Ubuntu: New Bug description: I have a MacBookPro9,1, which has both an integrated Intel HD Graphics 4000 controller and a discrete Nvidia GeForce GT 650M. I want to disable the Nvidia graphics and boot using Intel only, since I don't need the Nvidia chip's capabilities and it shortens battery life (and makes suspend/resume not work; see bug #1084960). But when I blacklist the Nouveau driver and reboot using the Intel driver only, the X server fails to start: it reports "no screens found" and crashes. I'm booting using EFI rather than BIOS; not sure whether that's relevant. I'll attach the X server log and the dmesg log. Just let me know if there's any other information I can provide. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1190806/+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
