[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 #126 from Philip Könighofer <philip at koenighofer.net> ---
(In reply to comment #125)
> (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.

Try to update your dock to the new firmware. It should resolve this issue, at
least if you are using only a single external display!

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