[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 #5 from dwagner <jb5sgc1n.nya at 20mm.eu> ---
Sure can do: This I find in Xorg.0.log:

[    36.956] (--) AMDGPU(0): HDMI max TMDS frequency 300000KHz
[    36.956] (II) AMDGPU(0): Printing probed modes for output HDMI-A-0
[    36.956] (II) AMDGPU(0): Modeline "3840x2160"x60.0  594.00  3840 4016 4104
4400  2160 2168 2178 2250 +hsync +vsync (135.0 kHz eP)
[    36.956] (II) AMDGPU(0): Modeline "4096x2160"x60.0  594.00  4096 4184 4272
4400  2160 2168 2178 2250 +hsync +vsync (135.0 kHz e)
[    36.956] (II) AMDGPU(0): Modeline "4096x2160"x50.0  594.00  4096 5064 5152
5280  2160 2168 2178 2250 +hsync +vsync (112.5 kHz e)
[    36.956] (II) AMDGPU(0): Modeline "4096x2160"x59.9  593.41  4096 4184 4272
4400  2160 2168 2178 2250 +hsync +vsync (134.9 kHz e)
[    36.956] (II) AMDGPU(0): Modeline "4096x2160"x30.0  297.00  4096 4184 4272
4400  2160 2168 2178 2250 +hsync +vsync (67.5 kHz e)
[    36.956] (II) AMDGPU(0): Modeline "4096x2160"x25.0  297.00  4096 5064 5152
5280  2160 2168 2178 2250 +hsync +vsync (56.2 kHz e)
[    36.956] (II) AMDGPU(0): Modeline "4096x2160"x24.0  297.00  4096 5116 5204
5500  2160 2168 2178 2250 +hsync +vsync (54.0 kHz e)
[    36.956] (II) AMDGPU(0): Modeline "4096x2160"x30.0  296.70  4096 4184 4272
4400  2160 2168 2178 2250 +hsync +vsync (67.4 kHz e)
[    36.956] (II) AMDGPU(0): Modeline "4096x2160"x24.0  296.70  4096 5116 5204
5500  2160 2168 2178 2250 +hsync +vsync (53.9 kHz e)
[    36.956] (II) AMDGPU(0): Output HDMI-A-0 using initial mode 3840x2160 +0+0
... 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.

>From the first parameter of the Modelines one can already see that modes with
594.00 MHz clock are found, and indeed, the "3840x2160" mode at 60Hz is used,
as both xrandr and the connected display report:

HDMI-A-0 connected 3840x2160+0+0 (normal left inverted right x axis y axis)
1600mm x 900mm
   3840x2160     60.00*+  50.00    59.94    30.00    25.00    24.00    29.97   
23.98

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