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On my laptop I can not adjust the screen brightness and when I try to change it manually I get the following result.
# echo 256 > /sys/class/backlight/nvidia_backlight/brightness
zsh: file exists: /sys/class/backlight/nvidia_backlight/brightness
I have 'nvidia-bl' installed and configured however I think the issue is that I cannot modify the brightness setting itself. Does anyone know how I can fix this?
The software required Windows XP or better, so I installed archlinux.
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You might need either:
acpi_backlight=vendor
In your grub kernel line. Or:
Option "RegistryDwords" "EnableBrightnessControl=1"
In the device section of your xorg.conf
ᶘ ᵒᴥᵒᶅ
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Not sure if this is your problem, but my older MacBook Pro uses "/sys/class/backlight/mbp_backlight/backlight"
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Hi guys, sorry for the late reply but I have tried the suggestions with no success. When I try to manually change the brightness or fan speed for that matter I get the same message as the original post (cmp-daemon fails to load). It's like the system is denied access to these components. I should mention that the model is a Macbook Pro 6,1.
#Grub.cfg
quiet reboot=pci acpi_backlight=vendor
# /etc/X11/xorg.conf.d/20-nvidia.conf
Section "Device"
Identifier "Default nvidia Device"
Driver "nvidia"
Option "NoLogo" "False"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
#
# /etc/rc.conf - Main Configuration for Arch Linux
#
# -----------------------------------------------------------------------
# LOCALIZATION
# -----------------------------------------------------------------------
LOCALE="en_US.UTF-8"
DAEMON_LOCALE="no"
HARDWARECLOCK="UTC"
TIMEZONE="Australia/Melbourne"
KEYMAP="us"
CONSOLEFONT="Lat2-Terminus16"
CONSOLEMAP=""
USECOLOR="yes"
VERBOSE="3"
# -----------------------------------------------------------------------
# HARDWARE
# -----------------------------------------------------------------------
MOD_AUTOLOAD="yes"
MODULES=(acpi-cpufreq cpufreq_performance cpufreq_ondemand cpufreq_powersave coretemp cpuid i2c-dev nvidia_bl hfsplus fuse)
UDEV_TIMEOUT=30
USEDMRAID="no"
USEBTRFS="no"
USELVM="no"
# -----------------------------------------------------------------------
# NETWORKING
# -----------------------------------------------------------------------
HOSTNAME="Guardian"
INTERFACES=(!eth0 !wlan0)
gateway="default gw 192.168.0.1"
ROUTES=(!gateway)
NETWORK_PERSIST="no"
#NETWORKS=(main)
# -----------------------------------------------------------------------
# DAEMONS
# -----------------------------------------------------------------------
DAEMONS=(syslog-ng laptop-mode cmp-daemon dbus networkmanager netfs ntp alsa gpm crond pommed)
# /etc/pommed.conf
#
# Configuration file for pommed
#
# General configuration
general {
# fnmode: functions keys first (no need to use fn) or last
# Value is either 1 or 2, effect is hardware-dependent
fnmode = 1
}
# sysfs backlight control
# nVidia machines, will fall back to nv8600gmt if not supported by the kernel
lcd_sysfs {
# The sysfs backlight control is a generic interface provided
# by the Linux kernel for backlight control on most graphic cards.
# The brightness range can differ depending on the hardware.
# initial backlight level [12] (0 - 15, -1 to disable)
init = 1023
# step value (1 - 2)
step = 40
# backlight level when on battery [6] (1 - 15, 0 to disable)
on_batt = 6
}
# ATI X1600 backlight control (MacBook Pro v1 & v2)
lcd_x1600 {
# initial backlight level [200] (0 - 255, -1 to disable)
init = -1
# step value (1 - 127)
step = 10
# backlight level when on battery [80] (1 - 255, 0 to disable)
on_batt = 80
}
# Intel 945GM, 965GM backlight control (MacBook v1-v4, MacBook Air v1)
lcd_gma950 {
# initial backlight level [0x6f] (0x1f - 0x94 usually, -1 to disable)
init = -1
# step value (0x01 - 0x20)
step = 0x0f
# backlight level when on battery [0x40] (0x1f - 0x94 usually, 0 to disable)
on_batt = 0x40
}
# nVidia GeForce 8600M GT/9400M/9600M GT backlight control
# (MacBook Pro v3-v5, MacBook v5, MacBook v2)
lcd_nv8600mgt {
# initial backlight level [12] (0 - 15, -1 to disable)
init = -1
# step value (1 - 2)
step = 1
# backlight level when on battery [6] (1 - 15, 0 to disable)
on_batt = 6
}
# Audio support
audio {
# disable audio support entirely
disabled = no
# Use amixer or alsamixer/alsamixergui to determine the sound card
# and the mixer elements to use here.
# sound card to use
card = "default"
# initial volume [80] (0 - 100%, -1 to disable)
init = -1
# step value (1 - 50%)
step = 10
# beep on volume change
beep = yes
# mixer element for volume adjustment
volume = "PCM"
# mixer element for muting the speakers
speakers = "Front"
# mixer element for muting the headphones
headphones = "Headphone"
}
# Keyboard backlight control
kbd {
# default value for automatic backlight (0 - 255)
default = 100
# step value (1 - 127)
step = 10
# ambient light thresholds for automatic backlight (0 - 255)
on_threshold = 20
off_threshold = 40
# enable/disable automatic backlight
auto = yes
# idle timer - fades keyboard backlight automatically (timeout in seconds, -1 to disable)
idle_timer = 60
# idle level - level to fade keyboard to after idle_timer seconds. Defaults to switching off.
# idle_level = 20
}
# CD/DVD drive ejection
eject {
# enable/disable eject key
enabled = yes
# CD/DVD device
device = "/dev/dvd"
}
# Beeper
beep {
# enable/disable beeper
# automatically disabled if audio support disabled above
enabled = no
# WAV file to use (from pommed: goutte.wav or click.wav in /usr/share/pommed)
beepfile = "/usr/share/pommed/goutte.wav"
}
# Apple Remote - deprecated
# Note: the appleir driver is required for this to work; this driver has been
# obsoleted with Linux 2.6.22, so unless you are running a kernel < 2.6.22 or
# use the appleir driver on a newer kernel, this won't work.
# You should use LIRC instead.
appleir {
# enable/disable the appleir support
enabled = no
}
The software required Windows XP or better, so I installed archlinux.
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Option "RegistryDwords" "EnableBrightnessControl=1"
In the device section of your xorg.conf
I had already nvidia_bl installed, but adding that line to my xorg.conf works for me.
Thank you very much.
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