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);
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