https://bugs.freedesktop.org/show_bug.cgi?id=111122
--- Comment #26 from Matt D. codespunk+bugzilla.freedesktop@gmail.com --- Created attachment 145172 --> https://bugs.freedesktop.org/attachment.cgi?id=145172&action=edit amd_fix.sh
I've been having a problem with display corruption on Fedora using recent updates. Here is my report on their bug tracker:
https://bugzilla.redhat.com/show_bug.cgi?id=1745380
I can confirm that when compiz is enabled, the system will lock up when it's started. Adding "iommu=pt" to the kernel flags in grub2 will allow the system to boot without freezing but the display is still corrupt.
Adding "AMD_DEBUG=nodcc" to the environment provides a complete workaround (without the need for the kernel flag).
I've attached a file "amd_fix.sh" which if placed in /etc/profile.d/ will provide a workaround until this can be fixed in the kernel or wherever the problem is.