RADEONSetupForSolidLine() is missing a FINISH_ACCEL() call, which happens to have no effect with MMIO but causes the preceding register write not to be executed with CP acceleration.
Created attachment 704 [details] [review] Fix
Committed, thanks!
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.