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Topic: [SOLVED] No backlight controller was found (Read 3090 times) previous topic - next topic
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[SOLVED] No backlight controller was found

I'v manage to succesfully install artix on my MBP Mid 2015 15inch. Everything is perfect, i love Artix so much.

But there's a problem i'v try to solve but it still not work.

I'v install these package: xf86-video-intel xf86-input-libinput mesa

And use light to try config my backscreen light, but when i try, it just show

Code: [Select]
No backlight controller was found, so we could not decide an automatic target...

I'v try this command to found my screen backlight target but can't found it:

Code: [Select]
sudo find /sys -type f -iname '*brightness*'

This is the result:
Code: [Select]
/sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/brightness
/sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/max_brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.1/0003:05AC:0274.0004/input/input11/input11::scrolllock/brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.1/0003:05AC:0274.0004/input/input11/input11::scrolllock/max_brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.1/0003:05AC:0274.0004/input/input11/input11::capslock/brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.1/0003:05AC:0274.0004/input/input11/input11::capslock/max_brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.1/0003:05AC:0274.0004/input/input11/input11::numlock/brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.1/0003:05AC:0274.0004/input/input11/input11::numlock/max_brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.1/0003:05AC:0274.0004/input/input11/input11::kana/brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.1/0003:05AC:0274.0004/input/input11/input11::kana/max_brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.1/0003:05AC:0274.0004/input/input11/input11::compose/brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.1/0003:05AC:0274.0004/input/input11/input11::compose/max_brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:05AC:8290.0005/input/input9/input9::capslock/brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:05AC:8290.0005/input/input9/input9::capslock/max_brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:05AC:8290.0005/input/input9/input9::numlock/brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:05AC:8290.0005/input/input9/input9::numlock/max_brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:05AC:8290.0005/input/input9/input9::scrolllock/brightness
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:05AC:8290.0005/input/input9/input9::scrolllock/max_brightness
/sys/module/video/parameters/hw_changes_brightness
/sys/module/video/parameters/brightness_switch_enabled
/sys/module/i915/parameters/invert_brightness

Am i missing something or something when wrong with my device. Thank you very much <3

Re: No backlight controller was found

Reply #1 –
You can try xbacklight (xorg-xbacklight). The backlight function keys on my MBP work out of installation.

Re: No backlight controller was found

Reply #2 –
install linux-headers first and if you look at archwiki ....
Screen backlight
Intel, works on Linux 3.13
Framebuffer, works for MacBook Pro 11,1 and 11,3 via /sys/class/backlight/gmux_backlight/brightness.
Brightness in /sys/class/backlight/gmux_backlight/brightness can be modified comfortably via the gmux_backlightAUR utility without root privileges. Requires the setpci setting below.
Nvidia, does not work using default settings. Try executing as root setpci -v -H1 -s 00:01.00 BRIDGE_CONTROL=0. It may be worthwhile to create a systemd unit to execute this on boot.
AMD models may require a patched kernel for the backlight to be adjusted. The linux-macbookAUR kernel fixes this.
Note: If the screen does not show the prompt or the login manager (i.e. a black screen), append i915.invert_brightness=1 to the kernel.

Re: No backlight controller was found

Reply #3 –
Quote from: tkor – on
install linux-headers first and if you look at archwiki ....
Screen backlight
Intel, works on Linux 3.13
Framebuffer, works for MacBook Pro 11,1 and 11,3 via /sys/class/backlight/gmux_backlight/brightness.
Brightness in /sys/class/backlight/gmux_backlight/brightness can be modified comfortably via the gmux_backlightAUR utility without root privileges. Requires the setpci setting below.
Nvidia, does not work using default settings. Try executing as root setpci -v -H1 -s 00:01.00 BRIDGE_CONTROL=0. It may be worthwhile to create a systemd unit to execute this on boot.
AMD models may require a patched kernel for the backlight to be adjusted. The linux-macbookAUR kernel fixes this.
Note: If the screen does not show the prompt or the login manager (i.e. a black screen), append i915.invert_brightness=1 to the kernel.


https://wiki.archlinux.org/index.php/MacBookPro11,x#Screen_backlight


which init use you?

try add to your boot manager (grub, syslinux, etc.)

Code: [Select]
video.use_native_backlight=1

what say
Code: [Select]
 light -L

and you can try this:
https://github.com/IvanMalison/dotfiles/blob/master/dotfiles/lib/bin/macbook_brightness.py
https://aur.archlinux.org/packages/macbook-lighter/

Re: No backlight controller was found

Reply #5 –
Quote from: alium – on
https://wiki.archlinux.org/index.php/MacBookPro11,x#Screen_backlight


which init use you?

try add to your boot manager (grub, syslinux, etc.)

Code: [Select]
video.use_native_backlight=1

what say
Code: [Select]
 light -L

and you can try this:
https://github.com/IvanMalison/dotfiles/blob/master/dotfiles/lib/bin/macbook_brightness.py
https://aur.archlinux.org/packages/macbook-lighter/

I'v tried installed linux-headers but everything still not work. Btw,  my MBP have Intel chip

This is output of light -L

Code: [Select]
❯ light -L
No backlight controller was found, so we could not decide an automatic target. The current command will have no effect. Please use -L to find a target and then specify it with -s.

Listing device targets:
    sysfs/leds/input12::kana
    sysfs/leds/input9::capslock
    sysfs/leds/input12::compose
    sysfs/leds/input12::scrolllock
    sysfs/leds/smc::kbd_backlight
    sysfs/leds/input9::numlock
    sysfs/leds/input9::scrolllock
    sysfs/leds/input12::numlock
    sysfs/leds/input12::capslock
    util/test/dryrun

Also there are nothing on my '/sys/class/backlight' folder :((

Re: No backlight controller was found

Reply #6 –
I'm using runit init system

Where can i put this:
Code: [Select]
video.use_native_backlight=1

I'v opened `usr/default/grub` but it seem have different config syntax

Re: No backlight controller was found

Reply #10 –
I'v figure it out. Turn out i do have 'nomodeset' in my grub default. Relate to this post

With out nomodeset, my system stuck forever on udev. But with nomodeset i can't use backlight, i even can't suspend my laptop. :((
 

Re: No backlight controller was found

Reply #12 –
Quote from: tkor – on
Try this plz
Code: [Select]
nomodeset acpi_osi=Linux acpi_backlight=vendor

https://wiki.archlinux.org/index.php/backlight#Kernel_command-line_options

I'v tried every thing but nothing work.

Finally, i'v try to install from bottom up and try linux-lts firmware. Just as i guess, everything work out of the box.

Btw thank you all for your supports. I'v tried it again when i have time.