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)
Status: Incomplete => Invalid
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1812161
Title:
Screen backlight control does not work in Disco on Dell XPS 9560
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