Please try dumping the registers when using kms and ums using avivotool as root:
avivotool regs all > ums.regs
avivotool regs all > kms.regs
And attach the dumps here. Please specify what versions of xf86-video-ati and kernel you used to make the dumps.
Please try dumping the registers when using kms and ums using avivotool as root:
avivotool regs all > ums.regs
avivotool regs all > kms.regs
And attach the dumps here. Please specify what versions of xf86-video-ati and kernel you used to make the dumps.