[Bug 578894] Re: Cannot detect AC adapter status and battery charge status on Acer Aspire 4820TG

[Raven]

I can confirm this fix works, but you need to set 
GRUB_CMDLINE_LINUX="acpi_osi=Linux"
under GRUB in my case.  Same laptop, same model number.  I can only assume Donnarumma had it set while trying to fix some other bug.

Still, it takes a while for the battery applet to display that the
laptop is on battery.  The effect can be seen in the output of acpi -b a
little sooner, though.

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Cannot detect AC adapter status and battery charge status on Acer Aspire 4820TG 
https://bugs.launchpad.net/bugs/578894
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