We have a number of reports of the gfxpayload=keep causing black screens on boot. It would be good to confirm that this issue is resolved with just that single change. You can set that via /etc/default/grub, adding GRUB_PAYLOAD_LINUX=text and then running sudo update-grub.
Also are you using the proprietry ATI drivers or open source?
We have a number of reports of the gfxpayload=keep causing black screens on boot. It would be good to confirm that this issue is resolved with just that single change. You can set that via /etc/default/grub, adding GRUB_PAYLOAD_ LINUX=text and then running sudo update-grub.
Also are you using the proprietry ATI drivers or open source?