I'm curious what the TDMS bandwidth limit values in get_tmds_link_bandwidth()
are based on.
We're using chipset == 44 cards that happily run 1600x1200@60 using the
propriety driver and which also used to work with nouveau up to Linux 2.6.36.2.
Since 2.6.37, nouveau refuses to use that mode because the required 163M pixel
clock exceeds the computed TDMS bandwidth of 155M (earlier versions allowed for
165M regardless of chipset value).
Although I cannot tell for sure which timing the closed-source driver runs
1600x1200@60 with on these monitors, I find it unlikely that it uses some
built-in, non-EDID timing requiring a lower pixel clock. I also don't suspect
NVidia running their own chips above specs.
So either NVidia doesn't disclose the specs even to their own programmers, the
values in get_tmds_link_bandwidth() are wrong, or, more likely, I'm missing
something.
Patching get_tmds_link_bandwidth() to allow for 165M already for chipset >=
0x44 appears to work. However, I don't feel comfortable with stretching rates
above spec.
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