I mean that I can type, move the mouse pointer, open new windows but there is a lag until these changes are displayed. Stuttering like. I ended up not reverting the aforementioned commit but modifying it. This also solves the issue. Here is the patch: diff -rupN a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c --- a/drivers/gpu/drm/drm_crtc_helper.c??? 2013-02-19 00:58:34.000000000 +0100 +++ b/drivers/gpu/drm/drm_crtc_helper.c??? 2013-04-05 23:10:36.454936677 +0200 @@ -1067,7 +1067,7 @@ void drm_helper_hpd_irq_event(struct drm ???? enum drm_connector_status old_status; ???? bool changed = false; ? -??? if (!dev->mode_config.poll_enabled) +??? if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) ???? ??? return; ? ???? mutex_lock(&dev->mode_config.mutex); -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/intel-gfx/attachments/20130405/413397de/attachment.html>