[Bug 87172] UHD 4K (DisplayPort 1.2) monitor autodetects at 60Hz on Radeon 5870, which fails as this card doesn't support DP1.2

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87172

--- Comment #1 from Alex Deucher <alexdeucher at gmail.com> ---
Created attachment 110680
  --> https://bugs.freedesktop.org/attachment.cgi?id=110680&action=edit
possible fix

This patch should fix it.

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