I added "acpi_rsdp=efi acpi_backlight=vendor" to the grub parameters
(/etc/default/grub). Fixes the backlight issue, but the laptop won't
suspend and the battery indicator doesn't show up...
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Oh, and I agree -- this should be *much* more important that 'low', as
it makes the laptop useless if I can't remove it from the corner where I
charge it...
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https://bugs.launchpad.net/bug
Same issue on Dell Mini 9 after upgrade. Tried live distro, same issue,
so it's not caused by upgrade. Recalibrated battery, ran for 2.5 hours
on battery to off, so it's safe to say the battery is not, in fact,
critically low...
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Another workaround:
1) Close lid, let laptop go to sleep.
2) Unplug laptop.
3) Open lid, wakeup.
4) Use your laptop.
5) When done, close lid, let it go to sleep.
6) Plug in.
Works on my Dell Mini9...
How do we raise the severity to 'Critical'? This is a showstopper for
effected laptop users...
