I ran FWTS on my system and it gave the following:
ADVICE: The ACPI video driver has found a duplicate ACPI video bus device for
the same VGA controller. If the current driver does not work, one can try to
work around this using the video.allow_duplicates=1 kernel parameter.
I ran FWTS on my system and it gave the following:
ADVICE: The ACPI video driver has found a duplicate ACPI video bus device for duplicates= 1 kernel parameter.
the same VGA controller. If the current driver does not work, one can try to
work around this using the video.allow_
Note: Dell D420, Ubuntu 14.04, kernel: 3.11.0-14