[Bug 101026] RX 550 HDMI 4k 60fps not working, DisplayPort is.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101026

--- Comment #6 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to dwagner from comment #5)
> ... and also later...
> [   133.973] (--) AMDGPU(0): HDMI max TMDS frequency 300000KHz
> ...
> [   152.286] (--) AMDGPU(0): HDMI max TMDS frequency 300000KHz
> ... 
> etc., seemingly as often as the EDID is re-read/re-considered.
> 

The message is from the xserver, not the driver.  It's warning you because the
clock for the mode exceeds the max TMDS clock as stated by the EDID.

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