amdgpu: detected screen resolution is incompatible with UHD tv

The tv is a 43" 3840x2160 samsung an by chance was misdetected as a 83" one
In this event it was working at native resolution and had the login visible.

I tried but I'm unable to make this happen at will.

not an issue with the file manager nautilus

found a pattern,

the display is working if
the computer is turned on while the tv is off AND was turned off while was select another hdmi port

in this condition when turning on the tv is misdetected as 85" but with right 3840x2160 30Hz

any other attempt detected 43" and then nothing works to get the appropriate 3840x2160 30Hz

when failing xrandr

Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 8192 x 8192
XWAYLAND0 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 950mm x 540mm
   3840x2160 29.98*+

when working xrandr

Screen 0: minimum 320 x 200, current 5760 x 2160, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 connected 1920x1200+3840+0 (normal left inverted right x axis y axis) 519mm x 324mm
   1920x1200 59.95*+
   1920x1080 60.00 59.94
   1600x1200 60.00
   1680x1050 59.95
   1600x900 60.00
   1280x1024 60.02
   1280x800 59.81
   1280x720 60.00 59.94
   1024x768 60.00
   800x600 60.32
   720x480 60.00 59.94
   640x480 60.00 59.94
   720x400 70.08
HDMI-A-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 1872mm x 1053mm
   3840x2160 30.00*+ 25.00 24.00 29.97 23.98
   4096x2160 24.00 23.98
   1920x1080 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
   1920x1080i 60.00 50.00 59.94
   1680x1050 59.88
   1600x900 60.00
   1280x1024 75.02 60.02
   1440x900 59.90
   1366x768 59.79
   1280x800 59.91
   1152x864 75.00
   1280x720 60.00 50.00 59.94
   1024x768 75.03 70.07 60.00
   832x624 74.55
   800x600 72.19 75.00 60.32
   720x576 50.00
   720x576i 50.00
   720x480 60.00 59.94
   720x480i 60.00 59.94
   640x480 75.00 72.81 66.67 60.00 59.94
   720x400 70.08

from dmesg

[ 193.460043] [drm:atom_op_jump [amdgpu]] *ERROR* atombios stuck in loop for more than 5secs aborting
[ 193.460072] [drm:amdgpu_atom_execute_table_locked [amdgpu]] *ERROR* atombios stuck executing D672 (len 824, WS 0, PS 0) @ 0xD7C1
[ 193.460086] [drm:amdgpu_atom_execute_table_locked [amdgpu]] *ERROR* atombios stuck executing D52C (len 326, WS 0, PS 0) @ 0xD5C8
[ 198.464030] [drm:atom_op_jump [amdgpu]] *ERROR* atombios stuck in loop for more than 5secs aborting
[ 198.464045] [drm:amdgpu_atom_execute_table_locked [amdgpu]] *ERROR* atombios stuck executing D672 (len 824, WS 0, PS 0) @ 0xD7B4
[ 198.464070] [drm:amdgpu_atom_execute_table_locked [amdgpu]] *ERROR* atombios stuck executing D52C (len 326, WS 0, PS 0) @ 0xD5C8

more from dmesg about amdgpu
[ 1.199336] amdgpu 0000:02:00.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff

and there is at least one talk already open elsewhere
https://bugs.freedesktop.org/show_bug.cgi?id=98798