Thread: firmware bug "_DOD but not _DOS"

i have upgraded system , stopped working.
laptop inspiron 17r n7110
have ubuntu 11.10, bumblebee installed use nvidia card.

tried old kernels didn't work.

grub options are:
grub_cmdline_linux_default="quiet splash acpi=noirq i915.semaphores=1 acpi=noirq pcie_aspm=force i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 gfxmode=1920x1080"

Forum The Ubuntu Forum Community Ubuntu Official Flavours Support Hardware [ubuntu] firmware bug "_DOD but not _DOS"

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