On Tue, 18 May 2021 at 12:17, Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> wrote: > > On Tue, May 18, 2021 at 12:09:56PM +0100, Emil Velikov wrote: > > Hi Ville, > > > > On Mon, 17 May 2021 at 18:24, Ville Syrjälä > > <ville.syrjala@xxxxxxxxxxxxxxx> wrote: > > > > > > On Sun, May 16, 2021 at 06:14:32PM +0100, Emil Velikov wrote: > > > > From: Vivek Das Mohapatra <vivek@xxxxxxxxxxxxx> > > > > > > > > This patch is to do with seamless handover, eg when the sequence is > > > > bootloader → plymouth → desktop. > > > > > > > > It switches the vga arbiter from the "other" GPU to the default one > > > > (intel in this case), so the driver can issue some io(). > > > > > > I don't understand what this commit message is trying to say. > > > > > Bunch of context is lost due to the patch age, so I'm not 100% sure of > > the actual hardware setup where this occurs. > > Does the following make sense? > > > > Currently on dual GPU systems, we do not get seamless handover as the > > output flickers during the transition bootloader -> plymouth -> > > desktop. > > This happens as a result of switching (via the VGA arbiter) from the > > "other" GPU back to the default i915 one and issuing io() commands. > > Hmm. Does this work? > Thanks I'll it give it a try. Might need a few days to find the right hardware/software combination. -Emil
