@pemasu
I wonder... looking in Xorg.0.log:
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[ 229.494] (II) AMDGPU(0): Not using mode "2240x1400" (hsync out of range)
[ 229.494] (II) AMDGPU(0): Not using mode "1920x1200" (hsync out of range)
[ 229.494] (II) AMDGPU(0): Not using mode "1920x1080" (hsync out of range)
[ 229.494] (II) AMDGPU(0): Not using mode "1600x1200" (hsync out of range)
[ 229.494] (II) AMDGPU(0): Not using mode "1680x1050" (hsync out of range)
[ 229.494] (II) AMDGPU(0): Not using mode "1280x1024" (hsync out of range)
[ 229.494] (II) AMDGPU(0): Not using mode "1440x900" (hsync out of range)
[ 229.494] (II) AMDGPU(0): Not using mode "1280x800" (hsync out of range)
[ 229.494] (II) AMDGPU(0): Not using mode "1280x720" (hsync out of range)
[ 229.494] (II) AMDGPU(0): Not using mode "1024x768" (hsync out of range)
[ 229.494] (II) AMDGPU(0): Not using mode "800x600" (hsync out of range)
[ 229.494] (II) AMDGPU(0): Not using mode "640x480" (hsync out of range)
[ 229.494] (II) AMDGPU(0): No remaining probed modes for output eDP
"hsync out of range" is a big clue. /etc/X11/xorg.conf has this:
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Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
HorizSync 35-81
VertRefresh 59-76
#UseModes "Modes0" #monitor0usemodes
# Option "PreferredMode" "1024x768" #monitor0prefmode
EndSection
..."PreferredMode" line might be different in your case.
This is interesting, what if, pristine bootup and X fails to start, you then comment-out that "HorizSync" line, like this:
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# sed -i -e 's%HorizSync%#HorizSync%' /etc/X11/xorg.conf
...that is removing the hsync boundaries. You can also use the 'mp' text editor. Then see if X starts:
If it does start, I wonder what hsync it has chosen? Maybe Xorg.0.log will say.