Thanks! Booted vmlinuz-3.9.0-030900-generic without the parameter, and
the backlight still cannot be adjusted.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: kernel-bug-exists-upstream
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https://bugs.launchpad.net/bugs/1173725
Title:
Acer V5-171 laptop: backlight cannot be adjusted unless passing
acpi_backlight=vendor
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