Fix issue with battery status update on HP Elitebook 8440p

[Lars Engels]

On Thu, Nov 13, 2014 at 11:13:14AM -0800, Adrian Chadd wrote:
> Hm.. Have you disabled anything in the bios?
> 
> Are there any bios updates available for that laptop?
> 
> Can you upload the full acpidump output somewhere?
> 

AFAIK ACPI battery status support is broken on most (all?) HP notebooks.
I've read some other people reporting this, too.
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