[Nouveau] [Bug 40747] [NV44] dual-link tmds no longer allowed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=40747

--- Comment #21 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to comment #20)
> huh?
> i said that it is *easy* to convince the kernel to pick the right mode. it's
> picking a wrong one only automatically.

Really? It sounds to me like you managed to fool the drm mode-verification
logic (or nouveau's is implemented incorrectly). If it was merely picking the
wrong one, the 1600x1200 one would be in the mode list, and it is not.

> there is no hardware limitation at all here.

Maybe, maybe not. Should be fairly easy to check. One way to do that would be
to try the thing I said. Or to change the 165mhz check to be >= 0x44 instead of
0x46.

> X appears more tenacious, apparently because it filters out the good mode
> earlier in the process. it's beyond me why it does that - it makes no sense

It just gets the list from the kernel. What's in
/sys/class/drm/card0-DVI-I-1/modes (or whatever the connector is)? The thing
you (or someone else) saw with X seeing the 1600x1200 mode was it reading it
from DDC. But I'm pretty sure it doesn't care about that -- X doesn't handle
modesetting, the kernel does, and it uses its mode list.

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/nouveau/attachments/20140205/5df05fde/attachment.html>