On Thu, Feb 01, 2018 at 08:33:29PM +0000, Chris Wilson wrote: > Quoting Kristian Høgsberg (2018-02-01 20:22:40) > > On Thu, Feb 1, 2018 at 9:53 AM Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > wrote: > > > > > Quoting Andy Lutomirski (2018-02-01 17:40:22) > > > > *However*, I do see one unfortunate side effect of turning on PSR. It > > > > seems that, when I move my cursor a little bit after a few seconds of > > > > doing nothing, there seems to be a little bit of lag, as if either a > > > > few frames are dropped at the beginning of the motion or maybe the > > > > entire motion is delayed a bit. I don't notice a similar delay when > > > > typing, so I'm wondering if maybe there's a min > > > or driver bug in which > > > > the driver doesn't kick the panel out of PSR quite as quickly when the > > > > cursor is updated as it does when the framebuffer is updated. > > > > > One thing that's important know regarding the cursor is whether the > > > display server is using a HW cursor or SW cursor. Could you please attach > > > the log from the display server (or if you are using a stock > > > distribution that's probably enough to work out what it is using)? > > > -Chris > > > > We had a similar problem for Rockchip in ChromeOS and ended up using an > > input handler to let us start the PSR exit as early as possible: > > Reminds me of mutter devs suggesting that we may like to kick the gpu to > max clocks high frequency on any input activity as well. (I'm still not > convinced that's a good idea, for mundane typing we barely need to wake > up the gpu. :) I guess it all depends on expected wakeup latencies, but > I didn't think PSR had multi-frame lag? yeap. This shouldn't be needed for PSR. The wakeup latency is definitely not a problem here. All the current PSR related corner cases and limitations are probably still related to *what* cases to exit PSR rather than *when*. So I'd say the governor there is probably covering few of missing cases. > -Chris _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
