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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [Lenovo ThinkPad T450s] System hang with MST dock"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103643#c27">Comment # 27</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [Lenovo ThinkPad T450s] System hang with MST dock"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103643">bug 103643</a>
from <span class="vcard"><a class="email" href="mailto:johan.freedesktop@thoren.xyz" title="Johan Thorén <johan.freedesktop@thoren.xyz>"> <span class="fn">Johan Thorén</span></a>
</span></b>
<pre>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!</pre>
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