On Fri, May 17, 2019 at 09:44:46AM -0700, Rodrigo Vivi wrote: > On Fri, May 17, 2019 at 07:34:23PM +0300, Ville Syrjälä wrote: > > On Fri, May 17, 2019 at 09:17:39AM -0700, Rodrigo Vivi wrote: > > > On Thu, May 16, 2019 at 03:49:19PM +0000, Summers, Stuart wrote: > > > > On Thu, 2019-05-16 at 18:42 +0300, Jani Nikula wrote: > > > > > On Thu, 16 May 2019, "Summers, Stuart" <stuart.summers@xxxxxxxxx> > > > > > wrote: > > > > > > On Thu, 2019-05-16 at 12:59 +0300, Jani Nikula wrote: > > > > > > > On Tue, 14 May 2019, Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> wrote: > > > > > > > > One possibility that just came to my mind now is, what if we > > > > > > > > make > > > > > > > > this only for platforms that are still protected by > > > > > > > > is_alpha_support=1 > > > > > > > > (soon becoming require_force_probe=1) > > > > > > > > > > > > > > Please don't conflate alpha_support or force_probe with > > > > > > > *anything* > > > > > > > else. > > > > > > > > > > > > > > > But this is just one side of the coin... when product is out > > > > > > > > there > > > > > > > > and we want the user to debug the issue to see if it is a RC6 > > > > > > > > bug > > > > > > > > we have no way to verify that. :/ > > > > > > > > > > > > > > The problem is, if it works with rc6 disabled, it doesn't prove > > > > > > > it's > > > > > > > an > > > > > > > rc6 bug either. > > > > > > Well, RC6 is the main GT power gating. The issue could be on may other > > > individual power gating, but if by disabling RC6 the issue is gone > > > it is a very good indication that it is a GT-PM bug somewhere. > > > > I disagree. In the recent past enable_rc6 was often used by > > people to workaround display underruns and whatnot. > > o.O > do you mean this was being used as a placebo? or real issue? > or something like by keeping rc6 gpu was keeping the power request > to punit high so display was receiving enough power to not strugle > with wm? or something like that or what? Disabling rc6 disables most package C-states, which makes life a lot easier for the display engine due to reduced memory access latencies. -- Ville Syrjälä Intel _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
