[Bug 75345] [HD4600] DVI does not support dual-link

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75345

--- Comment #7 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Created attachment 94640
  --> https://bugs.freedesktop.org/attachment.cgi?id=94640&action=edit
drm/i915: Reject >165MHz modes w/ DVI monitors

I think the real bug here is getting a black screen because we fail to filter
out the modes requiring dual-link operation. I think this patch should fix it.

I'm not sure if we should additionally reject such modes when the HDMI VSDB
indicates that the monitor support dual-link DVI. The spec seems to leave open
the possibility of supporting both dual-link and >165MHz over a single link,
and there's no way to tell the difference between monitors that do that, and
monitors that only support higher pixel clocks through dual-link DVI.

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