Re: i915 PSR test results and cursor lag

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Feb 1, 2018 at 9:40 AM, Andy Lutomirski <luto@xxxxxxxxxx> wrote:
> Hi-
>
> As requested in your blog post, I tested PSR.  I see something like
> 2.69W with PSR off and 2.17W with PSR on.  Screen blanking,
> suspend/resume, and the contents of the screen all seem okay.  This is
> a Dell XPS 13 9350, i.e.:
>
> System Information
>         Manufacturer: Dell Inc.
>         Product Name: XPS 13 9350
>
> EDID is attached.
>
> *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 minor 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.
>

I'm also getting occasional messages like:

[ 2675.574486] [drm:intel_pipe_update_start [i915]] *ERROR* Potential
atomic update failure on pipe A

with PSR on.  But there is nowhere near one of these messages per tiny
lag incident.
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel




[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux