[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 #8 from Tormen <tormen at diplomail.ch> ---
Hi,

Thanks again for your ultra-fast reply ! :))

Tried it... but it does not work.
I'll attach my video.c file.

Do you need maybe:
   kernel config ? 
   dmesg ?
   lspci -vvvnk ?

cat /proc/cmdline
\boot\vmlinuz-4.0.4-desktop-banana05 ro
root=UUID=7446ae27-f2a4-41a0-b8d3-fdce0e298a30  hid_apple.iso_layout=0 quiet
splash=silent  initrd=boot\initrd-4.0.4-desktop-banana05

find /sys -name brightness
/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
/sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/brightness

I am not sure about the different kernel parameters:
For me I could fix the problem using "acpi_backlight=vendor".
But the patch I think is based on:
 video.use_native_backlight
?

I guess I could try forcing this parameter to a certain value first ?
I think I read that there are the possible values: 0, 1 and -1 ?

Tormen

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