[Nouveau] [Bug 77529] [NVE7] NVS 510 DP-3 output doesn't work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77529

--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to comment #2)
> (In reply to comment #1)
> > Is it some enormous monitor (resolution-wise)?
> No.
> 
> > Is this a laptop + dock? If so, which ones?
> No. It is multimonitor, 4xminiDP videocard:
> http://www.nvidia.com/object/nvs-510-graphics-card.html
> 
> > Can you check if there's a kworker taking up 100% of cpu time (of 1 cpu)?
> Checked, no.
> 
> > Is the monitor actually connected via DP, or is it a DP -> HDMI (or DVI)
> > situation?
> All four monitors are connected via Apple miniDP to VGA adapters:
> http://store.apple.com/us/product/MB572Z/B/mini-displayport-to-vga-adapter

Very interesting. So you have 4 identical DP->VGA adapters, each plugged into
similar (identical?) monitors, and DP-3 is always the one that fails?

Can you attach a dmesg when booting with

nouveau.debug=VBIOS=trace,PDISP=trace drm.debug=0xe

That should provide a bunch of debug info, perhaps even enough to tell what's
going on.

Additionally, please attach your vbios (/sys/kernel/debug/dri/0/vbios.rom).

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