[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 #57 from Stefan <st.lendl at gmail.com> ---
(In reply to comment #56)
> (In reply to comment #54)
> > (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?
> 
> I don't know. Sadly i didn't have a device to try it out. I will try, when I
> get back to work after the holidays.
> And just for reference, i used Attachment #91164 [details] against the
> 3.13-rc4 vanilla kernel.

(In reply to comment #56)
> (In reply to comment #54)
> > (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?
> 
> I don't know. Sadly i didn't have a device to try it out. I will try, when I
> get back to work after the holidays.
> And just for reference, i used Attachment #91164 [details] against the
> 3.13-rc4 vanilla kernel.


Ok thx, I didn't have the part below @@ -1164,6 +1164,15 @@ in my kernel, so
I'll recompile with it and try again. Just changing to 500us i just know found
out that when only connecting HDMI it doesn't hang for some seconds and then
hangs as always.

Besides that I only tested with VGA which hangs instantly for me.

Any ideas why DP works but VGA/DVI don't? (I have no DP-device here to verify
if it works for me.)

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