You have been subscribed to a public bug:
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.
** Affects: xorg (Ubuntu)
Importance: Low
Status: Incomplete
** Tags: no-screens
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X server fails to start on MacBookPro9,1 with hybrid Intel/Nvidia graphics: no
screens found
https://bugs.launchpad.net/bugs/1190806
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