启动时改变亮度

Question

我的 Lenovo T440s 以最大亮度启动。在此线程之后，我尝试更改rc.local，但这不起作用。

当我执行命令时，cat /sys/class/backlight/acpi_video0/brightness我得到了输出851。然后我通过热键手动降低亮度并再次执行命令 - 它仍然显示851.

这让我相信我无法通过简单地向rc.local.

还有什么我可以尝试的吗？

---

这是grub内容

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT="0"
GRUB_HIDDEN_TIMEOUT="0"
GRUB_HIDDEN_TIMEOUT_QUIET="true"
GRUB_TIMEOUT="2"
GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo Debian`"
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL="console"

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE="640x480"

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID="true"

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

GRUB_DISABLE_OS_PROBER="true"

---

这是rc.local内容

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

#echo 2 > /sys/class/backlight/acpi_video0/brightness
#echo 2 > /sys/class/backlight/intel_backlight/brightness

#xrandr --output eDP1 --brightness 0.3
rfkill block bluetooth
#echo 3 > /sys/class/backlight/thinkpad_screen/brightness
exit 0

Answer 1

您是否尝试过使用某些软件来避免手动处理 sys 文件系统？我建议使用 xbacklight。

xbacklight -set 10

此命令会将屏幕亮度设置为 10%。您可以将其添加到 rc.local。

编辑：如果上述过程不起作用，则内核和 bios acpi 之间可能存在一些问题。编辑文件：/boot/grub/menu.lst

将以下参数添加到默认配置中： thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor

默认行应该是这样的：

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor"

保存修改后的文件并运行：

sudo update-grub

重新启动并检查 xbacklight 是否正常工作