misplaced windows and then host corrupts
I have a problem connecting to ubuntu on a Dell Optiplex-3080 (from mac os). Windows are broken and misplaced. Then the host corrupts! Previously it's ok for Dell Optiplex-3010 and Asus pc.
It starts with some things appear on the upper left corner over the main menu bar. Some window seems to have multiple copies being misplaced all over. Some disappears or loses control. After increasingly losing control, the host also losing windows and control. (then need to reboot).
Any help would be very very appreciated. Thanks.
Answers
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It happend in the following order.
1) computer B remote desktop to computer C
2) turn off monitor of C using displayport
3) computer A remote desktop to computer B
4) A sees broken windows of C
5) turn on monotor of C and actually see broken windows
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