To get the right log the easiest way, if you can switch to a text console while the X screen is broken, log in on the text console and copy the current log: cp /var/log/Xorg.0.log ~/Xorg.broken.txt
To get the right log the easiest way, if you can switch to a text console while the X screen is broken, log in on the text console and copy the current log: cp /var/log/Xorg.0.log ~/Xorg.broken.txt