Comment 13 for bug 818830

I just installed a fresh copy oneiric amd64 on my Thinkpad X220 i5-2520M. Without the extra kernel parameter my power consumption is about 16W, w/ the parameter it is about 8W in idle state.

I do not saw the graphic errors after some hours of working and a suspend/resume cycle. Due to an older Linux kernel Sandybridge bug, I had the following line in /etc/rc.local to set a sysfs value. Maybe the value prevents the graphics from getting corrupted:

echo -n 1 > /sys/module/i915/parameters/semaphores

Does this help anyone w/ the bug here?