On Tue, Apr 21, 2015 at 11:58:20AM +0200, Lukas Wunner wrote: > On MBPs, the panel is not connected to one of the gpus, but to the > gmux chip (the "handler" in vga_switcheroo speak). Initially the gmux > is switched to the discrete gpu. The integrated i915 gpu is therefore > unable to detect the LVDS (or eDP) connector on bootup and switching > to the integrated gpu will lead to a black screen. The solution is > to temporarily switch the DDC lines to the integrated gpu when reading > the EDID, which the gmux is capable of. Lack of support for this in > vga_switcheroo is pretty much the only obstacle to get gpu switching > to work on MBPs. My testing suggested that changing the DDC lines didn't change auxch, so this approach doesn't work for eDP. Have you found otherwise? -- Matthew Garrett | mjg59@xxxxxxxxxxxxx _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
