On 11/14/2017 01:06 PM, Michel Dänzer wrote: > I sometimes get the attached dmesg splat when the GDM login screen times > out and fades to black (presumably specifically when it finally sets > DPMS off, which disables the vblank interrupt). As you mention this and also that this happens intermittently I would suspect a race between page flip and DPMS(OFF) IOCTLs so by the time drm_atomic_helper_wait_for_vblanks is called from page flip the DPMS IOCTL already turned vblank off, but do_aquire_global_lock should protect exactly from such a race so maybe something broke around there. Maybe putting a WARN_ON(vblank interrupt status != ON) before waiting on it can shed some light on this. Thanks, Andrey > > I've seen this for the first time today, so it might have been > introduced by one of the DC changes which landed in amd-staging-drm-next > since yesterday. But since it doesn't happen every time, I can't be sure > of that yet. > >
