[Bug 73694] [hsw DP] Ubuntu 12.04 unable to use external monitor through edock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73694

--- Comment #4 from Marcus Bergner <marcusbergner at gmail.com> ---
This patch is gold!

I can confirm that the suggested patch solves the problem with the external
screen not starting correctly on boot or resume from sleep on a Dell Latitude
E7440 + E-Dock. Currently running a drm-intel 3.13.0-rc8 kernel on Fedora 20
with the proposed patch and the external screen now starts as it should. I no
longer have a problem where a kworker process eats CPU for about 5 minutes
until the screen is detected making the computer more or less unusable during
that time, and repeatedly writes out "failed to train dp aborting" in dmesg, so
a massive improvement.

Only remaining problem is to sort out issues with washed out colors on the
external monitor in Gnome (which existed before I applied this patch as well).

Thanks for this one.

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