(In reply to comment #5)

Hi Ilia, Ben,

I gave a shot at drm-next as of the following commit:

> commit bc1dfff04a5d4064ba0db1fab13f84ab4f333d2b
> Merge: c1a6e9f 1ae5a62
> Author: Dave Airlie <airlied@redhat.com>
> Date:   Wed Jun 11 16:28:10 2014 +1000
> 
>     Merge branch 'drm-nouveau-next' of git://anongit.freedesktop.org/git/nouveau
>     
>     display rework fixes lots of displayport issues.

I have been running that kernel for a large part of a work day, and, so
far, it has worked pretty well.

Many thanks!

Below are a couple remaining issues, none of which are blocking in my
case (GeForce 9400/DP/Dell U2711), but which may be worth investigating
if they also happen with other hardware combinations:

 1. The display does not wake up from (timed-out or forced) sleep on
    keypress or mouse move as it used to.  Activating the OSD menu wakes
    up the panel; Nouveau seems to pick that up as a hint to get going;

 2. The panel's backlight flickers very noticeably after a soft power
    cycle.  It also flickers, but less noticeably, after a hard unplug/
    re-plug.  Force-switching to an unconnected input source and back
    makes it stable again.

Let me know if there's any way I can assist you further.  In the
meantime, thanks again—it seems I'm not stuck with 3.8 anymore!

Cheers, -D