[Nouveau] [Bug 93405] nouveau: Xorg crashes sooner or later in 3840x2160 mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93405

--- Comment #15 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I can't quite tell what you're trying to do, but here are a few pieces of
information that you may find useful:

HDMI cables can only carry a single TMDS link. (Not enough pins for more.)
DVI cables can carry one or two TMDS links, each maxing at 165mhz (for a total
of 330mhz for dual-link DVI).

The maximum TMDS link speed nouveau will allow on HDMI connectors is 165MHz.

With kernel 4.5 (or anything that includes
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1a0c96c075bb4517d4ce4fb6750ee0a3cf38714c
and a few of the surrounding commits), you will be able to override this by
setting nouveau.hdmimhz=anything-you-want. We have no idea where to get the
limits from, so we just set it to

165mhz for tesla and earlier
225mhz for fermi
297mhz for kepler+

We'll have to figure something out for HDMI 2.0 eventually. But again, this is
all with the above commits; with kernel 4.4 it's just 165mhz for HDMI.

Assuming your connector and cables support it, dual-link DVI will give you the
highest maximum frequency.

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