doing what Felix proposed at #16 didn't work on natty (2.6.38-8-generic): # echo 1 > /sys/module/i915/parameters/semaphores -bash: echo: write error: Invalid argument
However, doing what proposed on #18 solved the problem. XPS L502X with optimus/bumblebee working -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/761065 Title: [Sandybridge] Spurious "*ERROR* Hangcheck timer elapsed... blt ring idle" messages in dmesg when using compiz -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs