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

[bugzilla-daemon at freedesktop.org]

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

Lakshmi <lakshminarayana.vudum at intel.com> changed:

           What    |Removed                     |Added
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                 CC|                            |anshuman.gupta at intel.com

--- Comment #30 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(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?

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