Oops, it was either acpi_osi=! or acpi_osi='Windows 2009' that was
causing the problem. I had copied them in to try and get the nvidia card
working after resume, but it turns out they aren't needed for the nvidia
card to work anyway.
Sorry for the noise.
** Changed in: upower (Ubuntu)
Rocko,
You seem to have some newer kernels installed. Does booting those have
the same problem?
Also, maybe you can try downgrading to cosmic's upower version:
https://launchpad.net/ubuntu/+source/upower/0.99.8-2ubuntu0.1
to see if it was a regression in upower.
** Changed in: linux (Ubuntu)
Ah, yes, Kai-Heng Feng probably makes a better point in comment #2.
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https://bugs.launchpad.net/bugs/1812161
Title:
Screen backlight control does not work in Disco on Dell
Please remove all acpi* kernel parameters and see if it helps.
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https://bugs.launchpad.net/bugs/1812161
Title:
Screen backlight control does not work in Disco on Dell XPS
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Also affects: upower (Ubuntu)
Importance: Undecided
Status: New
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