[Bug 23495] nouveau KMS produces no output on a Dell 3008WFP monitor

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

http://bugs.freedesktop.org/show_bug.cgi?id=23495


Ben Skeggs <skeggsb-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
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             Status|NEW                         |ASSIGNED




--- Comment #2 from Ben Skeggs <skeggsb-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-08-24 20:35:19 PST ---
Ok, this looks like a failure to setup dual-link TMDS which the larger monitor
would require to run at its native resolution.  To solve the immediate problem,
load the nouveau kernel module with "modprobe nouveau duallink=0" to reject
modes that require more bandwidth than is available on single-link TMDS.  You
won't be running at your monitor's native mode, but you should have an image.

Now, we don't know exactly how to program dual-link as of yet so if you're
willing to do some experimentation that'd be *really* good.  Also, grabbing
traces of the NVIDIA binary driver initialising it would help a lot.  See
http://nouveau.freedesktop.org/wiki/MmioTrace for details on how to do this.

For some random testing that may help, try playing with the uscript_tmds module
option.  Valid values for most cards are 0x0001 0x0002 and 0x0105.  0x0001 is
the default, to try the others use "modprobe nouveau uscript_tmds=0x0105" etc.

Thanks!


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