Please run "apport-collect 1249219" in order to collect some useful
logs.
I think adding the boot flag of "acpi_backlight=vendor" on your next
boot should make the values change in
/sys/class/backlight/intel_backlight/brightness.
** Package changed: ubuntu => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1249219
Title:
backlight control acpi_video0 instead intel_backlight
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