Mainline kernel doesn't fix this issue - tested with the same boot flags, only
acpi_osi= is bringing backlight control back.
Tested with 4.3.0-040300-generic #201511020949
** Tags added: kernel-bug-exists-upstream
kernel-bug-exists-upstream-4.3.0-040300-generic
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1516320
Title:
Cannot change backlight on my laptop
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