[Bug 49402] [snb dp dongle] DP-to-dual-HDMI (link_train issue?)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49402

--- Comment #17 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
I tried a few random things for this on IVB.

- tried to send the training pattern and training lane set with one aux write
instead of two.
- tried to disable enhanced framing
- tried to force some voltage swing/pre-emphasis values
- tried with 6 bpc so that we'd get 1.62 links speed instead of 2.7
- tried to send post cursor2 traning values in case that would trick the sink
into cooperation

Unfortunately none of that helped.

The BIOS produces a picture with the dongle, so I tried to compare some of the
register values. The main differences I saw were that the BIOS uses auto
training for FDI, some of the M/N values were different, and of course the BIOS
also has panel fitter active since it's using a 720x400 resolution.

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