Comment # 20 on bug 56139 from Alexandre Demers

Should I have a look at how grub2 handles and talks to the kernel when using
gfxpayload=keep? A quick search shows this issue has been lurking for some time
(2010) with various radeon card
(https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/605614,
http://frugalware.org/pipermail/frugalware-devel/2012-February/011500.html,
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=567245,
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=567393).

Could something be wrong when handling the framebuffer?