> Pierre Couderc composed on 2021-07-09 09:05 (UTC+0200): > > >> Yes, EDID is wrong and does not show 3840x2160 warranted by Samsung >> for UR59C 32". > > > > With dual displays, setup is more complicated, instead of > /etc/X11/xorg.conf.d/50-monitor.conf try /etc/X11/xorg.conf with the > following content: > > Section "Device" Identifier "UHD620" Driver "modesetting" Option > "monitor-eDP-1" "eDPcon" Option "monitor-HDMI-1" "HDMIcon" > EndSection > > Section "Monitor" Identifier "HDMIcon" HorizSync 30-135 VertRefresh > 29-31 Option "PreferredMode" "3840x2160" EndSection > > Section "Monitor" Identifier "eDPcon"Section "Monitor" Identifier > "HDMIcon" HorizSync 30-135 VertRefresh 29-31 ModeLine > "3840x2160_30.00" 339.57 3840 4080 4496 5152 2160 2161 2164 2197 > -HSync +Vsync Option "PreferredMode" "3840x2160_30.00" EndSection > > Section "Monitor" > > Option "Primary" "true" EndSection > > Section "Screen" Identifier "extScreen" Device "UHD620" Monitor > "HDMIcon" EndSection > > Section "Screen" Identifier "intScreen" Device "UHD620" Monitor > "eDPcon" EndSection > > Also, make sure your HDMI cable is up to specs for 4K.
The HDMI cable was provided with the Samsung display.see : https://paste.debian.net/1203999/
for( .local/share/xorg/Xorg.0.log)
Section "Monitor"
Identifier "HDMIcon"
HorizSync 30-135
VertRefresh 29-31
ModeLine "3840x2160_30.00" 339.57 3840 4080 4496 5152
2160 2161 2164 2197 -HSync +Vsync
Option "PreferredMode" "3840x2160_30.00"
EndSection
The result is : https://paste.debian.net/1204000
It does not strictly crashes but only the first monitor is displayed in X mode, the second monitor (HDMI) remains as in non X mode, and the mouse does not want to quit the high left corner of the HDMI monitor.
I feel as if there is some driver problem...
Than you very much, Felix, I progress !