Might be an oldie for the nerds here but it took me a while to figure this out, thought I'd share the solution.

If objects or the screen are/is flickering in games running in Wine, edit /etc/default/grub and do

sudo gedit /etc/default/grub
and add "nomodeset" the the kernel options, like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"
Then do

sudo update-grub
and reboot.