the last drm-next-kmod worked fine on my Lenovo T420 with i5-2520M and a HD Graphics 3000. After the update to the actual version (4.11) from ports, I'm seeing regression in form of a very slow xfce4-desktop. The slowness starts after some short time. Slow means for example that I can type faster than the terminal prints the chars or when i move windows they lag extremely behind the mouse's motion.

One entry in Xorg.0.log caught my attention:
[ 128.266] (EE) intel(0): Failed to submit rendering commands (Bad address), disabling acceleration.

Disabling the xfce4-compositor improves the situation significantly, but not entirely.

Switching back to the systems i915 driver resolves the issue.

Any ideas?

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