Re: i915 PSR test results and cursor lag

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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:


https://chromium.googlesource.com/chromiumos/third_party/kernel/+/chromeos-4.4/drivers/gpu/drm/rockchip/rockchip_drm_psr.c#345

It's similar in spirit to the interactive cpufreq governor:

   https://lwn.net/Articles/662209/

Kristian
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