[Bug 71267] sna: (Haswell) X-server freezes when enabling DP at docking station

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71267

--- Comment #145 from Sree Harsha Totakura <freedesktop at h.totakura.in> ---
(In reply to comment #131)
> From the kernel perspective it's fixed when we don't freeze the machine even
> when a dock with buggy firmware is connected, which is what my patches fix.
> 
> Plus we need to follow-up on comment #125.

Jani, my earlier comment was a false alarm.  My apologies.  I confirm that your
patches work very well for my T440s with an Ultra Dock (firmware not updated). 
I tested with following two scenarios:
1. Booting while docked and then using xrandr to split the display.
2. Booting undocked and then dock and use xrandr to split the display.
The changes worked well for both scenarios, albeit some minor delay which is
very much acceptable.

As mentioned by Tso earlier, there were some "*ERROR* too many retries, giving
up" messages.  Here are the dmesg outputs for the above two scenarios.
https://bugs.freedesktop.org/attachment.cgi?id=93971
https://bugs.freedesktop.org/attachment.cgi?id=93972

This bug may now be closed.

Thanks!

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