ubuntu亮度无法自动调节终极解决方案

ubuntu亮度无法自动调节终极解决方案

这个问题纠结了我快两年，主要是自己懒，写了个脚本来调节亮度，不过还是稍显不便。近日兴起折腾了一番，终于找到问题根结了。

 

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ACPI

 to find out:

# ls /sys/class/backlight/

intel_backlight

 on an ATI card. In the following example, acpi_video0 is used.

actual_brightness  brightness         max_brightness     subsystem/    uevent             
bl_power           device/            power/             type

:

# cat /sys/class/backlight/acpi_video0/max_brightness
15

. Obviously you cannot go any higher than your screen's maximum brightness. The values for maximum brightness and brightness in general vary wildly among cards.

# echo 5 > /sys/class/backlight/acpi_video0/brightness

acpi_osi=Linux acpi_backlight=vendor

acpi_osi=Linux acpi_backlight=legacy

acpi_backlight=vendor will prefer vendor specific driver (e.g. thinkpad_acpi, sony_acpi, etc.) instead of the ACPI video.ko driver.

看了这个之后，很显然，问题就在于acpi_backlight=vendor will prefer vendor specific driver (e.g. thinkpad_acpi, sony_acpi, etc.) instead of the ACPI video.ko driver. 所以我们只要sudo nano /etc/default/grub, 然后sudo update-grub && sudo reboot