[Bug 103643] [Lenovo ThinkPad T450s] System hang with MST dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103643

--- Comment #27 from Johan Thorén <johan.freedesktop at thoren.xyz> ---
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!

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