[Bug 93361] 12bpc hdmi causes wrong real refresh rate (swapbuffers return time)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93361

--- Comment #2 from Matt Horan <matt at matthoran.com> ---
I'm experiencing a similar issue, except that in my case, my TV displays an
error when 12bpc is enabled.

I have my computer connected to an HDMI receiver, which is in turn connected to
my TV. While my TV supports 12bpc, my HDMI receiver does not. My guess is that
the EDID is getting mangled somewhere, causing the Intel driver to pick up the
wrong mode.

When I connect my computer directly to my TV, all is fine. 

I also traced this back to 7a0baa6234468aa387f9b8a1a79dc2a4b4821f67. All is
fine before this commit, and goes haywire after.

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