https://bugzilla.kernel.org/show_bug.cgi?id=55941
laurent.debian@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |laurent.debian@gmail.com
--- Comment #4 from laurent.debian@gmail.com 2013-04-06 01:55:28 --- I have been very puzzled when reading your last message Alex, since I got (on debian) the exact same problem with a Mux system intel Ironlake/radeon Hd5650. The same issue occurs with kernel 3.7.6 (compiled by me) while the switch works correctly one the "distrib" kernel 3.2.0-4-ppae. Another issue appears with kernel 3.8.5 (with the NEW default modesetting bla for radeon..) but in that case X seems to crash (well i don't really now what's happening only got the little "-" on the top left of my screen) I would be glad to give any addiotionnal infos relevant or to file a bug myself.
(In reply to comment #3)
You have a muxless powerxpress system so there are no displays physically connected to the radeon card. The only way to utilize the radeon card is for offscreen rendering (radeon renders application frame and the frame is copied to the intel card for display). You need the new gpu hotplug features in xserver 1.13.x or 1.14 to utilize the card in that manner.