The given workaround (and also "sudo glxgears") produces rendering errors: glxgears overdraws windows lying over glxgears. So DRI seems to be defect in some way, but I'm not sure if this is related to this bug.
The given workaround (and also "sudo glxgears") produces rendering errors: glxgears overdraws windows lying over glxgears. So DRI seems to be defect in some way, but I'm not sure if this is related to this bug.