Bug 100922 - Redundant nv_backlight created on Optimus enabled laptop.
Summary: Redundant nv_backlight created on Optimus enabled laptop.
Status: RESOLVED WONTFIX
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/nouveau (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Nouveau Project
QA Contact: Xorg Project Team
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-05-04 05:23 UTC by Kai-Heng Feng
Modified: 2017-05-10 07:08 UTC (History)
0 users

See Also:
i915 platform:
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Attachments

Description Kai-Heng Feng 2017-05-04 05:23:29 UTC 
Original bug report:
https://bugs.launchpad.net/bugs/1683445

On Dell E6430, Optimus is enabled in BIOS settings, there are two backlights interface being created: intel_backlight and nv_backlight. Changing brightness in nv_backlight does nothing, intel_backlight is in charge here.

Userspace backlight control tools (unity-settings-daemon/gnome-settings-daemon) will use nv_backlight on this laptop, because nouveau is card0 here.

Dived a little deeper, nv_backlight is created because 'connector->connector_type' is DRM_MODE_CONNECTOR_LVDS on this laptop.

Can we disable nouveau's backlight on Optimus laptop?
Comment 1 Kai-Heng Feng 2017-05-10 07:08:48 UTC 
This can be resolved via userspace program:  https://bugzilla.gnome.org/show_bug.cgi?id=782211

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