[Bug 76811] Kernel sets wrong screen brightness resuming from suspend on Optimus enabled laptop

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=76811

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |aaron.lu at intel.com
          Component|Video(DRI - Intel)          |Power-Video
           Assignee|damien.lespiau at intel.com    |acpi_power-video at kernel-bug
                   |                            |s.osdl.org
            Product|Drivers                     |ACPI

--- Comment #4 from Jani Nikula <jani.nikula at intel.com> ---
On resume, ACPI video driver restores the backlight brightness on all devices
that have a backlight interface, in order. In your case I think whatever has
been set for acpi_video1 will override the acpi_video0 setting.

The brightness hotkeys probably only change acpi_video0 (please confirm!). I'm
not sure if the keys get routed through userspace on your machine or not (Aaron
can check), and I'm also not sure what the userspace does (or should do) given
multiple acpi backlight interfaces.

In any case acpi_video0 and intel_backlight seem to work, and more or less in
sync, so not our bug. Reassigning to ACPI video.

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