Comment 88 for bug 1727662

(In reply to Johan Thorén from comment #27)
> Hi Anshuman,
>
> 1. Is this issue is seen when u connect a external display directly to
> laptop without dock?
>
> It happens more frequently (it seems) when connected through a dock, but it
> also happens when using a cable directly to the laptop.
>
> 2. Have u screen the display tear issue on embedder panel of laptop.
>
> It never happens on the embedded panel, only on external displays.
>
> 3. As i see from dmesg logs your external display resolution is 1920x1080,
> have u observed the issue with other monitors or with other resolution modes.
>
> Actually, the resolution of the screen is 1920x1200. I have, however,
> observed the same behavior on a screen that has 1920x1080 resolution, as
> well as an older VGA screen with a lower resolution that I don't know as we
> speak.
>
> 4. could you please let me know if you see this issue after running below
> command
>
> echo "2 0 0 0 0 0 0 0" > /sys/kernel/debug/dri/0/i915_pri_wm_latency
>
> After running this command I did not notice the problem. Was this command
> supposed to fix the problem or provoke it? If it's meant to fix it, I will
> need to test more extensively since I only had the opportunity to test for
> maybe 20 minutes.
>
> Let me know if anything is needed. Thanks for taking the time!

@Anshuman, any further suggestions?