[Bug 54273] kms blackscreen ATI RV620 FirePro 2260, res: 2560*1600

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54273

--- Comment #43 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #42)
> Adding/setting a modeline in xrandr for the native resolution at 80hz
> (instead of 60hz) works around this problem in X. I noticed my dell monitor
> was outputting at 56hz when it should have been at 75hz on a lower
> resolution. There seems to be a 3/4 ratio between what the display sees and
> what xrandr sees.

It sounds like your monitor may prefer a different DP lane count and clock rate
than the driver wants to use.  The link training appears to complete
successfully, but the monitor doesn't seem to like the selected lane/rate. 
Bumping the clock up to 80Hz, you're probably getting a different lane/rate
combination that the monitor prefers. See radeon_dp_set_link_config() in
atombios_dp.c.

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