Nothing was changed. It suddelnly stopped to detect monitor.
I have resolved the issue by some entry into default configuration. I have edited the file /etc/gdm/PreSession/Default
and entered followings at the end of file /etc/gdm/PreSession/Default
xrandr --newmode "1240x1024_60.00" 105.50 1240 1320 1448 1656 1024 1027 1037 1063 -hsync +vsync
xrandr --addmode VGA1 1240x1024_60.00.
Now It is working fine.
Thank you very much.
Thanks & regards,
Originally Posted by EricTRA
Hello and welcome to LinuxQuestions,
If you say that earlier it was working fine, then what has changed? What's your graphic card? Open a terminal and type:
Check for a line that says something like VGA and put that line here.