[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 #18 from Matt Horan <matt at matthoran.com> ---
Created attachment 129730
  --> https://bugs.freedesktop.org/attachment.cgi?id=129730&action=edit
EDID for Sony TV via Rotel RSX-1058 receiver

Here is the EDID for my Sony TV as presented by my Rotel receiver. Note that,
IIRC, the EDID shows 12bpp support, and the TV does in fact support 12bpp.

However, my Rotel RSX-1058 receiver only supports HDMI 1.1, thus preventing
12bpp support.

I've worked around this issue by editing the EDID to disable 12bpp support.
This is done by the drm_kms_helper.edid_firmware kernel flag.

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