I get occasional glitches while watching HD movies with VLC. This happens with the newest version from git a8d1eaf6ee1fed0aeff681d33864e17cb904ddd3, and I did not observe it when using 57c48e4973ac0dad09744eaa82315a5f023094e7. However this might just be a coincidence and does not necessarily mean that a bug was introduced between the two version. 

Symptoms: The images freezes for a few seconds and then comes back with artifacts similar to what it looks like when a key frame is missing. /sys/class/drm/card0/error attached.

Dmesg messages:
[26553.172000] [drm] stuck on render ring
[26553.174058] [drm] GPU HANG: ecode 0:0x85dffffd, in Xorg [1049], reason: Ring hung, action: reset
[26553.174063] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[26553.174065] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[26553.174067] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[26553.174069] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
[26553.174072] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[26629.612772] UDP: bad checksum. From 37.104.123.245:60388 to 192.168.1.150:6881 ulen 42
[26907.019499] [drm] stuck on render ring
[26907.020990] [drm] GPU HANG: ecode 0:0x85dffffd, in Xorg [1049], reason: Ring hung, action: reset
[27196.926206] [drm] stuck on render ring
[27196.927106] [drm] GPU HANG: ecode 0:0x85dffffd, in Xorg [1049], reason: Ring hung, action: reset
[27196.927146] [drm:intel_pipe_set_base] *ERROR* pin & fence failed
[27196.927244] [drm:intel_pipe_set_base] *ERROR* pin & fence failed
[27202.912016] [drm] stuck on render ring
[27202.912664] [drm] GPU HANG: ecode 0:0x85dffffd, in Xorg [1049], reason: Ring hung, action: reset
[27202.912708] [drm:i915_context_is_banned] *ERROR* gpu hanging too fast, banning!
[27324.903703] [drm] stuck on render ring
[27324.904372] [drm] GPU HANG: ecode 0:0x85dffffd, in Xorg [22268], reason: Ring hung, action: reset
[27596.804940] [drm] stuck on render ring
[27596.806607] [drm] GPU HANG: ecode 0:0x85dffffd, in Xorg [22268], reason: Ring hung, action: reset
[27898.671281] [drm] stuck on render ring
[27898.672488] [drm] GPU HANG: ecode 0:0x85dffffd, in Xorg [22268], reason: Ring hung, action: reset