X session error

Xsession :warning:unable to write to /tmp; X session may exit with an error

登陆进入不了界面，可以进入命令行ctrl+alt+f1

磁盘

df -lh

#1777权限
ls -ld /tmp

sudo du --max-depth=1 -h
 
 du -k |sort -n |tail -10

磁盘目录满了清目录

https://www.experts-exchange.com/questions/26782995/Xsession-warning-unable-to-write-to-tmp.html

user@

点击okay提示 启动user@xxxxx.service失败

#tab补充uid
systemctl status user@

systemctl status user@xxxxx.service

/usr/bin/xxx文件权限被修改导致，具体那个文件待确认

sudo chmod u+s /usr/bin/* 导致

❯ su root
密码：
su: 鉴定故障
❯ ls -ld /usr/bin/su
-rwxr-xr-x 1 root root 71912  1月 21  2022 /usr/bin/su

❯ ls -ld /usr/bin/sudo
-rwsr-xr-x 1 root root 182600 1月 14 21:29 /usr/bin/sudo

#4755

chmod u+s /usr/bin/su rwsr-xr-x

屏幕亮度

背光

临时修改

❯ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
   1920x1080     60.02*+
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
❯ xrandr --output DP-0  --brightness 0.6
❯ xrandr --output DP-0  --brightness 0.96

xrandr –output DISPLAY –brightness MONITOR

“DISPLAY”和”MONITOR”替换为您的实际值

永久

默认是100

#acpi_video0或acpi_video1或 nvidia_0
ls  /sys/class/backlight/
 
echo 88 | tee /sys/class/backlight/nvidia_0/brightness

sudo update-rc.d custom-init defaults 90 #添加开机自启

sudo update-rc.d -f custom-init remove #移除

/etc/init.d

custom-init
❯ cat /etc/rc1.d/K01custom-init
#!/bin/sh
### BEGIN INIT INFO
# Provides:          custom-init   
# Required-Start:    $local_fs $network $remote_fs $syslog
# Required-Stop:     $local_fs $network $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: starts the custom-init daemon
# Description:   custom script    
### END INIT INFO


#屏幕亮度
##sudo update-rc.d  custom-init  defaults 90
## sudo update-rc.d -f custom-init remove
[ -f "/sys/class/backlight/nvidia_0/brightness" ] && { echo 72 | sudo tee /sys/class/backlight/nvidia_0/brightness ; }


  

调节伽马值

#默认值为1.0，越高则越亮，越低则越暗。
xgamma -gamma 0.9
xgamma -bgamma 0.9

-gamma f.f Gamma Value

-rgamma f.f Red Gamma Value

-ggamma f.f Green Gamma Value

-bgamma f.f Blue Gamma Value