[Nouveau] [Bug 76319] [NVE6] MMIO FAULT, black screen on QHD+ K2100M

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76319

--- Comment #2 from D. Moens <d-bugzilla at moens.cc> ---
Ilia, thank you for your instantaneous reply.

(In reply to comment #1)
> I think you may be the proud owner of multiple issues, as evidenced by the
> gpu lockup you get down the line.

Thanks, I feel honoured.

> First off, there's no way that load had those nouveau.debug settings. You
> would have seen a LOT more messages. I'm guessing you looked at some log
> file, and that log file ignores debug-level messages. Try checking in dmesg
> directly.

Full dmesg (with patch applied) attached.


> 
> Secondly, I'm pretty sure there's no way to achieve those resolutions
> without the 540MHz clock frequency provided for by DP1.2 (at least not with
> 24bit color). In core/engine/disp/dport.c:nouveau_dp_train, prepend a 540000
> value in the first position of the bw_list array.

Patched :

$ diff nouveau/nvkm/engine/disp/dport.c.orig nouveau/nvkm/engine/disp/dport.c
276c276
<     const u32 bw_list[] = { 270000, 162000, 0 };
---
> 	const u32 bw_list[] = { 540000, 270000, 162000, 0 };


> 
> Try to get a full debug log (which should include the various DP debug
> messages, as well as others), with that change, and the nouveau.debug
> settings you were already using (but apparently were either not being picked
> up, or something else).

Oh joy, I now do get a graphical screen (and high-res VT).

Appearantly, I am also bitten by bug #70354 (witness errors.out) ?

Please find all logs in attachment (with external monitor detached, for sake of
simplicity).


Again, thank you for your involvement.
Didier

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