[Bug 292873] New: intel_backlight on "switchable" graphics

[Aaron Bauman]

https://bugs.kde.org/show_bug.cgi?id=292873

           Summary: intel_backlight on "switchable" graphics
           Product: kde
           Version: unspecified
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: unassigned-bugs at kde.org
        ReportedBy: bauman.aaron at gmail.com


Version:           unspecified (using KDE 4.8.0) 
OS:                Linux

My system has the "HP Switchable graphics" setup which consists of 1 Intel
integrated graphics card and 1 Dedicated Radeon GPU.

I have found KDE is referencing the incorrect file when making adjustments to
the backlight of my system.  I have the following files for backlights.

/sys/class/backlight/acpi_video0
/sys/class/backlight/acpi_video1
/sys/class/backlight/intel_backlight

The brightness slider under power management and FN keys do work however the
changes are being reflected in the acpi_video1 file (confirmed with simple
'cat' on the command line).  Manual editing of intel_backlight confirms this is
the correct card to adjust brightness levels.  I have also found the following
bug which addresses the priority of different GPU's but does not include the
switchable graphics dilemma.  

https://bugs.kde.org/show_bug.cgi?id=288180


Reproducible: Always

Steps to Reproduce:
Attempt to adjust brightness.

Actual Results:  
The incorrect file reflected the brightness adjustments.

Expected Results:  
backlight adjusted.

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