Comment 1 for bug 915456

Can you update to the latest driver available (1.7.10.0.1.8-1linaro1), and then disable the drm polling to see if works better?

root@linaro-ubuntu-desktop:~# echo 0 > /sys/module/drm_kms_helper/parameters/poll

After disabling polling SGX is quite stable with my system, and it also behaves better when playing a video (without the sensation of loosing frames from time to time).

As robclark was saying at the IRC, this is probably because the way DVI is detected is by polling the i2c bus checking for a valid EDID, and for some reason the system will wait a timeout at the i2c driver, causing the frame drop.