首先 牽涉 到 兩種問題
Desktop doesn't remember brightness settings after a reboot
Decrease Backlight Below Minimum
根據 我的電腦 的 顯示器驅動是 INTEL HD 3000 圖形顯示卡
可參巧以下 的其中回覆
This function, the backlight control, is dependent on your bios and kernel version.
Try these four things.
Kernel (boot) options
If that works, edit /etc/default/grub and add those options to the default options.
# command line
sudo -e /etc/default/grub
# graphical
gksu gedit /etc/default/grub
Edit the "GRUB_CMDLINE_LINUX_DEFAULT" line so it looks like this
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
Save your edit, update grub
sudo update-grub
sudo update-initramfs -u -k all
sudo reboot
Command line
If that does not work, you can try to manually set the brightness.
Note: Path may vary with hardware / kernel version, you may need to browse the /proc/acpi directory to find the brightness setting and adjust the following commands accordingly.
IN MY CASE:
sudo nano /sys/class/backlight/ (acpi_video0 / intel_backlight ) /brightness
Change the value in this file to 500.
Press Ctrl + X to exit.
Press Y and Enter to save the file.
This works for me. You can also try echo value > /sys/.../brightness but I get a permission denied message even with sudo.
If that works, add it to /etc/rc.local
# command line
sudo -e /etc/rc.local
# graphical
gksu gedit /etc/rc.local
Add in your setting above "exit 0"
echo VALUE >/sys/class/backlight/(acpi_video0 / intel_backlight )/brightness
xbacklight
You can also try xbacklight
sudo apt-get install xbacklight
You then adjust with the command line
# For 80 % brightness
xbacklight -set 80
Again, add that to /etc/rc.local
# command line
sudo -e /etc/rc.local
# graphical
gksu gedit /etc/rc.local
Add in, above "exit 0"
xbacklight -set 80
setpci
You can try to set your brightness with setpci
You identify your pci bus address with
sudo lspci | grep VGA
Example
00:02.0 VGA compatible controller: Cirrus Logic GD 5446
setpci -s 00:02.0 F4.B=80
If you get your setting wrong, most likely you will just loose your display, and have to reboot. As this is a hardware setting, you really need to identify your hardware and research the settings first.
Other resources
