Dear Chris Wilson, > 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. I tried this, but the i915 didn't detect any panels connected to outputs. I think the panel is somehow "disconnected" from the eDP, maybe it's the apple GMUX thing interfering. > 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). Ok, I think I understand it a little. I will try to fiddle with the kernel a bit and see where it gets me. > -Chris Thanks a lot! Best regards, Marek Vasut
