Comment 75 for bug 1275794

(In reply to comment #53)
> (In reply to comment #50)
> > I also ran into this with a Thinkpad T440 and an Ultra Dock.
> >
> > I tried the patch in Comment 11 as well as changing the udelay(100) to
> > udelay(500), that Comment 29 mentioned. Didn't change anything: As soon as I
> > plug a monitor via VGA or DVI in the dock, the screen freezes and returns to
> > normal on undocking.
> >
> > I would be happy to supply further information, if you tell me what you need.
>
> My bad. I tried it today with the DiplayPort connectors: Works like a charm
> with the patched kernel. But, the DVI and VGA ports on the dock don't work.

Does the HDMI port work for you?