On Wed, Oct 12, 2022 at 05:24:56PM +0300, Ville Syrjälä wrote: > On Wed, Oct 12, 2022 at 01:49:36PM +0300, Ville Syrjala wrote: > > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > > > On HSW/BDW the hardware ELD buffer does not work if the controller > > is suspended. I'm not 100% which thing in there is needed to make it > > work (at least just forcing the controller into D0 with setpci is > > not enough). But a full runtime resume seems to do the trick here > > at least, and so far it looks like this doesn't even deadlock or > > anything. > > So this apparently works for evrything else except module reload, > where the ELD buffer isn't ready by the time we do the first modeset. > Strangely the same thing works fine at boot time when we first load > the drivers. Not sure what the difference is here. I think the difference was that during boot I had an enabled displays so we never turned off the power well. But during reload the power well gets disabled briefly and some state gets lost. -- Ville Syrjälä Intel
