[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 #148 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #147)
> Created attachment 94007 [details]
> dmesg with patch applied, old firmware
> 
> I applied the patch on the FC20 3.12 kernel and although there was no
> freeze, I got some scary error messages in my kernel logs. See attached
> output. This is a Lenovo W540 laptop running Fedora 20 with the latest
> laptop BIOS, but the old dock firmware.

That is to be expected if the display port sink replies with repeated aux defer
messages. Error for the retry limit first, then error for the modeset failing
due to this. Don't worry about it.

(The modeset failure message comes from the post-modeset state checker. We
could handle this more gracefully, but there are scenarios where the failures
we detect during modeset do not result in a non-working display... while
bailing out early would definitely result in a non-working display.)

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