Could you test the kernels at the URL below, it seems that some BIOSen have bad ACPI brightness interfaces which will now be being used, this kernel should detect and ignore these. It would be good to know if this fixes your issues:
http://people.ubuntu.com/~apw/lp311716-intrepid/
Could you test the kernels at the URL below, it seems that some BIOSen have bad ACPI brightness interfaces which will now be being used, this kernel should detect and ignore these. It would be good to know if this fixes your issues:
http:// people. ubuntu. com/~apw/ lp311716- intrepid/