As well, after changes in post #26 glxgears now works (old driver 3866 frames/5 secs, new driver 16188) and glxinfo runs with no caveats on my hardware.
As well, after changes in post #26 glxgears now works (old driver 3866 frames/5 secs, new driver 16188) and glxinfo runs with no caveats on my hardware.