https://bugzilla.kernel.org/show_bug.cgi?id=33672





--- Comment #19 from Lan Tianyu <tianyu....@intel.com>  2011-07-08 02:24:11 ---
From the acpidump, I find the dsdt in the bios fixedly returns zero as the
battery present rate to kernel. This is bios issue. 

(In reply to comment #18) 
> It appears that when the major linux distros switched from hal to udev/upower,
> there was some functionality lost. The fix has apparently been released for
> upower now:
> 
> http://cgit.freedesktop.org/upower/commit/?id=2d8358ae4eea4ecaa103891e660a5cdd4c166f5b
> 
> Broadly, it is just a question of sampling the battery state for a couple of
> minutes and estimating a rate from there.
So upower can resolve the problem for you in the every kernel version?

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