On Wed, Jul 03, 2013 at 01:35:35PM +0200, Marek Vasut wrote: > Hi Chris, > > > On Mon, Jul 01, 2013 at 10:39:14PM +0200, Marek Vasut wrote: > > > Hi guys, > > > > > > I recently got the rMBP 10,1 model, it has two graphic cards: > > > > > > 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core > > > processor Graphics Controller (rev 09) > > > 01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT > > > 650M Mac Edition] (rev a1) > > > > > > I'm running linux 3.10-rc7 . The nvidia works with nouveau, but I'd > > > prefer to switch the nvidia off altogether and use the intel GPU. > > > > > > So far I arrived at the point where I disabled X11, mounted debugfs and > > > tried the vgaswitcheroo. With the nvidia still in operation, I see the > > > console. Unfortunatelly, I end up with a black screen after I run the > > > following command to switch to the intel GPU: > > > > > > echo IGD > /sys/kernel/debug/vgaswitcheroo/switch > > > > > > If I try to switch back to the nvidia card (using echo DIS > ...), the > > > screen remains black. This state persists until reboot. I suspect [1] is > > > the same bug, none of the hints there helped. > > > > It is not that bug. This bug I believe is that no one has figured out > > how to reprobe the eDP and initialise it after a vgaswitch. > > Do we have any kind of hints into what direction I should dig ? I mean, I went > through the i915 source, went through David Airlies' patches [1] , but no > success so far. > > (User-unfriendly howto below, I hope this might help someone) > > The interesting part is that if I do the following, the intel card operates > correctly: > 1) power down the mac > 2) boot into OSX > 3) install gfxcardstatus 2.2.1 > 4) select Discrete first ; then select Integrated card (a popup must be > displayed in both cases in the top right corner indicating the operation > succeeded) > 5) reboot, start Linux > > Now in Linux, I do have nouveau blacklisted and the nvidia blob is NOT installed > at all. I > - modprobe nouveau > - mount -t debugfs debug /sys/kernel/debug > - echo OFF > /sys/kernel/debug/vgaswitcheroo/switch > > And I have 16W power consumption, therefore the intel card is in operation and > nvidia is probably off. The laptop is still a little hot in linux, but that's > OK. > > Yet I'd prefer to avoid the above booting into macos and do all this in Linux. > If you could give me any pointers, that'd be really appreciated. I think you should also be able to accomplish the same if you were to reload the i915 module after doing the vgaswitch. A starting point for patches would be for a notifier to run after vgaswitch, and for i915 to hook into that notification and reprobe panels (LVDS/eDP). -Chris -- Chris Wilson, Intel Open Source Technology Centre
