https://bugs.freedesktop.org/show_bug.cgi?id=99163
--- Comment #7 from Felix Schwarz felix.schwarz@oss.schwarz.eu --- (In reply to Timo Valtoaho from comment #6)
git bisected this to d57c0edfe00d3274b50f91ce3076ed0e82d28782.
commit d57c0edfe00d3274b50f91ce3076ed0e82d28782 Author: Alex Deucher alexander.deucher@amd.com Date: Wed Jul 8 14:08:12 2015 -0400
Revert "Revert "drm/radeon: dont switch vt on suspend""
This reverts commit ac9134906b3f5c2b45dc80dab0fee792bd516d52.
We've fixed the underlying problem with cursors, so re-enable this.
That is interesting as I have a Radeon 6450 which displayed "strange" colors after suspend (often but not always) and the problem was caused exactly by the same commit. However with my card I never had problems with HDMI audio after suspend.
I never filed a bug report as I could work around the issue by switching the VT manually (e.g. Ctrl+Alt+F2 / Ctrl+Alt+F1). Even better: After moving to Wayland (F25) I did not notice the bug anymore.