[Bug 100041] MacbookPro12,1 (early 2015): intel i915 iris 6100 with eDP : acpi_video backlight exists and is broken

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=100041

--- Comment #4 from Tormen <tormen at diplomail.ch> ---
Hi.

Compiling the kernel, it complained about missing function
"video_enable_native_backlight".

As all the other exceptions used "video_disable_native_backlight", I gave this
a shot. But this does not fix the problem: Using the new kernel while removing
the kernel cmdline parameter "acpi_backlight=vendor", brings back:

/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness
/sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/brightness

Was this function maybe added in a more recent kernel version than 4.0.4 ?


Not sure if important, but dmidecode shows 2 "Product Names":

Handle 0x0006, DMI type 1, 27 bytes
System Information
        Manufacturer: Apple Inc.
        Product Name: MacBookPro12,1
        Version: 1.0
        Serial Number: C02PP2V8FVH8
        UUID: 25EF0280-EC82-42B0-8FB6-10ADCCC67C02
        Wake-up Type: Power Switch
        SKU Number:  
        Family: MacBook Pro

Handle 0x0007, DMI type 2, 17 bytes
Base Board Information
        Manufacturer: Apple Inc.
        Product Name: Mac-E43C1C25D4880AD6
        Version: MacBookPro12,1
        Serial Number: C0251830058GDVN1K
        Asset Tag:  
        Features:
                Board is a hosting board
        Location In Chassis:  
        Chassis Handle: 0x0008
        Type: Motherboard
        Contained Object Handles: 0

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