[Nouveau] [Bug 54587] [NV1F] Flickering screen on Geforce 4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54587

--- Comment #35 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Patrick McMunn from comment #34)
> I wonder if this bug may either be related to, or may actually be the same
> as, bug 61537. I also have this same issue with a PC using an nVidia GeForce
> 4 MX IGP, and I know that the monitor attached to it has a bad EDID. I
> suspect Vesa may also have a monitor with a bad EDID; that would explain why
> his monitor's resolution was not correctly detected by Xorg (see comment
> #12).
> 
> I applied the above patch to Linux 4.4.11 sources, recompiled my kernel, and
> rebooted. The problem is not completely fixed, but it is noticeably
> improved. Whereas before the whole screen would intermittently jump, now
> there are simply random flashes of horizontal lines on random places on the
> screen. I generally run this box as a light-duty server, so I mainly ssh
> into it from my desktop, and I didn't boot into a GUI for testing. I just
> booted it and observed the text console.
> 
> I wouldn't consider this patch a fix, but it is perhaps a mitigation. In any
> case, since I suspect that this may actually be the same as bug 61537, it
> would probably be wise to discuss with other devs, per Martin Peres'
> comment, before submitting any changes to the tree.

Thanks for testing. The other bug you reference is on very different hardware
(G80+) which has an *entirely* different display unit. The patch I wrote was
based on a few observations of the old xf86-video-nv code compared to nouveau.
There were other differences, but those seemed like the biggest ones.

Sounds like some of the other ones still matter though if you're still seeing
flickering.

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