screen flickers after switching back from terminal to gdm

[Bram Kuijper]

Hi all,

thanks for the hint on sudo vbetool post, but when I executed this 
command in the tty1 terminal, this also did not help to prevent the 
flickering. I tried sudo vbetool post and then sudo /etc/init.d/gdm 
restart, but this still leaves me with a flickering screen when gdm 
boots up after restart.

what should I do to find out how this flickering screen is caused? Has 
anyone any pointers to diagnostic tools I could use to find out what is 
the problem?

thanks in advance,
Bram