[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 #125 from Sree Harsha Totakura <freedesktop at h.totakura.in> ---
(In reply to comment #115)
> I tried applying the two patches which you posted on intel-gfx[1], ported to
> 3.13.
> 
> [1] http://article.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/33737
> 
> Using a T540p and an Ultradock, connected to a Dell U2410 via a DisplayPort
> cable --- and it worked!  Not only were there no hangs, but in fact I could
> enable and disable the external display.  The "too many retries" did indeed
> trigger:

These patches did not work for me with my T440s.  During bootup it hangs upon
switch to FB.  Once booted undocked, it hangs when docked and external monitor
is enabled through xrandr.

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