问题：黑屏能看见鼠标，键盘和鼠标没有反应
在不小心升级pkg包后，系统无法进入xfce等xwindows，表现为黑屏和能看见鼠标，左上角有一个白字符块，键盘鼠标没有反应，整个系统卡住。但是可以ssh登录，内部的服务一切正常。
处理过程：
前面都是弯路，直接可以跳到Xorg配置和解决no screens found 报错问题这两部分。
使用xrandr查看显示
输入xrandr
报错can't open display
现在的问题就是解决么有display的问题，大约是在某个时间段，FreeBSD修改了xwindows的某个部件。。。。
用ssh登进去测试：
startx
xauth: file /home/skywalk/.serverauth.7188 does not exist
/usr/local/libexec/Xorg.wrap: Only console users are allowed to run the X server
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error
最后发现本身正常的时候，在tty控制台执行xrandr也是报错can't open display，所以这里走了弯路，一直在尝试解决这个报错。也就是这个报错不用去管它。
安装wayfile试试
# pkg install wayfire wf-shell alacritty swaylock-effects swayidle wlogout kanshi mako wlsunset问题照旧
咨询bing
You could do this (if your DISPLAY is :0):
$ export DISPLAY=:0
$ xrandr --listmonitors
$ xrandr your_command
输入set DISPLAY=:0
xrandr --listmonitors
还是Can't open display
（最终知道，xrandr这里是走弯路了，tty等下面本身就是Can't open display，在xwindows下才能显示显示器那些数值）
重新学习FreeBSD手册
学到使用pciconf来查看显卡
pciconf -lv|grep -B4 VGA
vgapci0@pci0:0:2:0: class=0x030000 rev=0x09 hdr=0x00 vendor=0x8086 device=0x1616 subvendor=0x17aa subdevice=0x2226
vendor = 'Intel Corporation'
device = 'HD Graphics 5500'
class = display
subclass = VGA查看是biso还是uefi
sysctl machdep.bootmethod
machdep.bootmethod: UEFI当然这个数据不重要
安装intel显卡
pkg install drm-kmod
sysrc kld_list+=i915kms降低intel显卡的cpu占用
pkg install libva-intel-driver mesa-libs mesa-dri当然这不是必须的。
Xorg配置
Xorg Configuration
Xorg supports most common video cards, keyboards, and pointing devices.
| Video cards, monitors, and input devices are automatically detected and do not require any manual configuration. Do not create xorg.conf or run a |
也就是除非自动配置失败，否则不需要使用下面命令或创建xorg.conf文件
sudo Xorg -configure
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running
(EE)
Fatal server error:
(EE) Cannot establish any listening sockets - Make sure an X server isn't already running(EE)
(EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
(EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
(EE)
(EE) Server terminated with error (1). Closing log file.intel显卡配置
Example 1. Select Intel® Video Driver in a File
/usr/local/etc/X11/xorg.conf.d/20-intel.conf
Section "Device" Identifier "Card0" Driver "intel" EndSection
尝试手工写这个文件20-intel.conf（当然最终是没有用到，把这个文件屏蔽掉了）
再次看显卡：
pciconf -lv | grep -B3 display
vgapci0@pci0:0:2:0: class=0x030000 rev=0x09 hdr=0x00 vendor=0x8086 device=0x1616 subvendor=0x17aa subdevice=0x2226
vendor = 'Intel Corporation'
device = 'HD Graphics 5500'
class = display
使用X -config调用配置文件
执行测试
sudo X -config /root/xorg.conf.new
密码：
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running
(EE)
Fatal server error:
(EE) Cannot establish any listening sockets - Make sure an X server isn't already running(EE)
(EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
(EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
(EE)
(EE) Server terminated with error (1). Closing log file.执行startx（好像问题照旧）
重新删除和安装Xorg和xfce包
重新删除Xorg和xfce包，重新安装，执行startx
报错no screens 。现在的问题就变成解决no screens这个问题了。这个问题最终解决方法，见后面。
查看生成的X配置文件
cat /root/xorg.conf.new
Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
ModulePath "/usr/local/lib/xorg/modules"
FontPath "/usr/local/share/fonts/misc/"
FontPath "/usr/local/share/fonts/TTF/"
FontPath "/usr/local/share/fonts/OTF/"
FontPath "/usr/local/share/fonts/Type1/"
FontPath "/usr/local/share/fonts/100dpi/"
FontPath "/usr/local/share/fonts/75dpi/"
FontPath "catalogue:/usr/local/etc/X11/fontpath.d"
EndSection
Section "Module"
Load "glx"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/sysmouse"
Option "ZAxisMapping" "4 5 6 7"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
EndSection
Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
### <percent>: "<f>%"
### [arg]: arg optional
#Option "Accel" # [<bool>]
#Option "AccelMethod" # <str>
#Option "Backlight" # <str>
#Option "CustomEDID" # <str>
#Option "DRI" # <str>
#Option "Present" # [<bool>]
#Option "ColorKey" # <i>
#Option "VideoKey" # <i>
#Option "Tiling" # [<bool>]
#Option "LinearFramebuffer" # [<bool>]
#Option "HWRotation" # [<bool>]
#Option "VSync" # [<bool>]
#Option "PageFlip" # [<bool>]
#Option "SwapbuffersWait" # [<bool>]
#Option "TripleBuffer" # [<bool>]
#Option "XvPreferOverlay" # [<bool>]
#Option "HotPlug" # [<bool>]
#Option "ReprobeOutputs" # [<bool>]
#Option "XvMC" # [<bool>]
#Option "ZaphodHeads" # <str>
#Option "VirtualHeads" # <i>
#Option "TearFree" # [<bool>]
#Option "PerCrtcPixmaps" # [<bool>]
#Option "FallbackDebug" # [<bool>]
#Option "DebugFlushBatches" # [<bool>]
#Option "DebugFlushCaches" # [<bool>]
#Option "DebugWait" # [<bool>]
#Option "BufferCache" # [<bool>]
Identifier "Card0"
Driver "intel"
BusID "PCI:0:2:0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 1
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
这样一通，启动后报错：no screens found
至少现在启动Xwindows不会卡死了，有小小的进步。
解决no screens found 报错问题
详细见：Xorg启动后报错no screens found(EE)（未解决）-CSDN博客
装驱动试试
sudo pkg install libva-intel-media-driver
startx后同样报错
试试安装intel-compute-runtime-llvm13
intel-compute-runtime-llvm13问题照旧
后面重装了Xorg、Xfce4
更新升级FreeBSD
具体做了如下操作：
upgrade FreeBSD 13.1 to 13.3 and then upgrade to 14.1
reinstall intel driver and Xorg Xfce4
at last install xf86-input-evdev
升级FreeBSD从13.1到13.3，然后再升级到14.1版本。
重新安装了Intel 显卡驱动和Xorg Xfce4
这时候startx还是报错，但是startxfce4能够进入Xfce4桌面了，问题是鼠标和键盘会卡住。
这个时候跟刚开始有点类似，只不过刚开始的时候是无法进入Xfce4桌面，而是屏幕显示左上角一个白色方块，中间是鼠标，鼠标和键盘都无法响应。而现在是能进入Xfce4桌面，鼠标和键盘都无法响应。
尝试安装envdev，try install evdev
通过搜索网上得知，鼠标和键盘无法响应可能是输入模块有问题，也就是xf86-input-evdev模块，于是安装这个模块：
pkg install xf86-input-evdevthen keyboard and mouse are OK !
安装完成后，鼠标和键盘正常。这样系统就基本修复完成了。
总结
整个解决问题的过程可以说是步履蹒跚。大致分成三个组成部分：
1 尝试解决xrandr的报错：can't open display，后来发现是乌龙，tty下本来就是报错的。这里走了弯路。
2 一顿操作猛如虎，现在至少每次startx的时候，系统不会卡住了。也就是启动后，鼠标键盘不会卡死，可以通过Ctrl+alt+Fn组合键，切换到Tty控制台，进行后面的操作。
所做的主要操作就是升级了FreeBSD的核心，从13.1升级到14.1，并重装了xorg Xfce以及其它驱动软件包。
最后发现更新完这些软件包后，删除掉以前手工写的config文件后（/usr/local/etc/X11/xorg.conf.d/）系统能够进入xfce桌面，但是鼠标和键盘卡住。
3 解决鼠标键盘卡住的问题
操作就是安装xf86-input-evdev
pkg install xf86-input-evdev关于no screens found的问题，值得单开一篇，文档记录：Xorg启动后报错no screens found(EE)（未解决）-CSDN博客
