[Nouveau] [Bug 70972] [NV67] Modesetting failure at 1280x800

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70972

--- Comment #41 from Ilia Mirkin <imirkin at alum.mit.edu> ---
All of the modesetting logic (for pre-G80 chips) lives in

drivers/gpu/drm/nouveau/dispnv04

This is mostly an adaptation of xf86-video-nv to work in the kernel, with some
IMHO misguided "cleanups" that were applied to some of the incomprehensible
clock/etc calculation code. Unfortunately those are also mixed in with legit
fixes, so it's hard to undo.

Either way, since xf86-video-nv also reputedly can't make 1280x800 work,
reading that source is unlikely to be of much help. However at least the NV1A
and NV1F IGP's tend to have their own very special clock calculation logic, so
perhaps that's missing (might look at what e.g. NV4C/NV4E do, as those
allegedly work well).

There are already traces of both the blob and nouveau and how they perform the
modesetting (see attachments in this bug). What's largely missing is
identifying what nouveau does differently, and then coming up with a way to fix
it.

You can use 'demmio' from envytools to help analyze the traces
(https://github.com/envytools/envytools).

If you have questions about the tooling or the code, feel free to join in
#nouveau on irc.freenode.net.

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