我遇到了问题。
我的用例：
- 我有：Ubuntu 电脑和安卓平板电脑，
- 我需要：Android 平板电脑作为第二台显示器，但通过 Wi-Fi 连接。
我接下来想做的事情是：
sudo apt-get install xserver-xorg-video-dummy x11vnc
之后，我改变了xorg.conf：
Section "Device"
Identifier "Configured Video Device"
Driver "radeon"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
EndSection
#Dummy videocard
Section "Device"
Identifier "Videocard0"
Driver "dummy"
VideoRam 256000
EndSection
Section "Monitor"
Identifier "Monitor0"
HorizSync 10.0 - 300.0
VertRefresh 10.0 - 200.0
DisplaySize 300 200
#The following modeline is invalid (calculator overflowed):
#Modeline "32000x32000@0" -38917.43 32000 32032 -115848 -115816 32000 32775 32826 33601
Modeline "16384x8192@10" 2101.93 16384 16416 24400 24432 8192 8390 8403 8602
Modeline "8192x4096@10" 424.46 8192 8224 9832 9864 4096 4195 4202 4301
Modeline "5120x3200@10" 199.75 5120 5152 5904 5936 3200 3277 3283 3361
Modeline "3840x2880@10" 133.43 3840 3872 4376 4408 2880 2950 2955 3025
Modeline "3840x2560@10" 116.93 3840 3872 4312 4344 2560 2622 2627 2689
Modeline "3840x2048@10" 91.45 3840 3872 4216 4248 2048 2097 2101 2151
Modeline "2048x2048@10" 49.47 2048 2080 2264 2296 2048 2097 2101 2151
Modeline "2560x1600@10" 47.12 2560 2592 2768 2800 1600 1639 1642 1681
Modeline "1920x1200@10" 26.28 1920 1952 2048 2080 1200 1229 1231 1261
Modeline "1920x1080@10" 23.53 1920 1952 2040 2072 1080 1106 1108 1135
Modeline "1680x1050@10" 20.08 1680 1712 1784 1816 1050 1075 1077 1103
Modeline "1600x900@20" 33.92 1600 1632 1760 1792 900 921 924 946
Modeline "1440x900@20" 30.66 1440 1472 1584 1616 900 921 924 946
Modeline "1360x768@20" 24.49 1360 1392 1480 1512 768 786 789 807
#common resolutions for android devices (both orientations):
Modeline "800x1280@20" 25.89 800 832 928 960 1280 1310 1315 1345
Modeline "1280x800@20" 24.15 1280 1312 1400 1432 800 819 822 841
Modeline "720x1280@25" 30.22 720 752 864 896 1280 1309 1315 1345
Modeline "1280x720@25" 27.41 1280 1312 1416 1448 720 737 740 757
Modeline "768x1024@25" 24.93 768 800 888 920 1024 1047 1052 1076
Modeline "1024x768@25" 23.77 1024 1056 1144 1176 768 785 789 807
Modeline "600x1024@25" 19.90 600 632 704 736 1024 1047 1052 1076
Modeline "1024x600@25" 18.26 1024 1056 1120 1152 600 614 617 631
Modeline "536x960@25" 16.74 536 568 624 656 960 982 986 1009
Modeline "960x536@25" 15.23 960 992 1048 1080 536 548 551 563
Modeline "600x800@25" 15.17 600 632 688 720 800 818 822 841
Modeline "800x600@25" 14.50 800 832 880 912 600 614 617 631
Modeline "480x854@25" 13.34 480 512 560 592 854 873 877 897
Modeline "848x480@25" 12.09 848 880 920 952 480 491 493 505
Modeline "480x800@25" 12.43 480 512 552 584 800 818 822 841
Modeline "800x480@25" 11.46 800 832 872 904 480 491 493 505
Modeline "320x480@50" 10.73 320 352 392 424 480 490 494 505
Modeline "480x320@50" 9.79 480 512 544 576 320 327 330 337
Modeline "240x400@50" 6.96 240 272 296 328 400 408 412 421
Modeline "400x240@50" 6.17 400 432 448 480 240 245 247 253
Modeline "240x320@50" 5.47 240 272 288 320 320 327 330 337
Modeline "320x240@50" 5.10 320 352 368 400 240 245 247 253
#resolutions for android devices (both orientations)
#minus the status bar
#38px status bar (and width rounded up)
Modeline "800x1242@20" 25.03 800 832 920 952 1242 1271 1275 1305
Modeline "1280x762@20" 22.93 1280 1312 1392 1424 762 780 783 801
Modeline "720x1242@25" 29.20 720 752 856 888 1242 1271 1276 1305
Modeline "1280x682@25" 25.85 1280 1312 1408 1440 682 698 701 717
Modeline "768x986@25" 23.90 768 800 888 920 986 1009 1013 1036
Modeline "1024x730@25" 22.50 1024 1056 1136 1168 730 747 750 767
Modeline "600x986@25" 19.07 600 632 704 736 986 1009 1013 1036
Modeline "1024x562@25" 17.03 1024 1056 1120 1152 562 575 578 591
Modeline "536x922@25" 16.01 536 568 624 656 922 943 947 969
Modeline "960x498@25" 14.09 960 992 1040 1072 498 509 511 523
Modeline "600x762@25" 14.39 600 632 680 712 762 779 783 801
Modeline "800x562@25" 13.52 800 832 880 912 562 575 578 591
Modeline "480x810@25" 12.59 480 512 552 584 810 828 832 851
Modeline "848x442@25" 11.09 848 880 920 952 442 452 454 465
Modeline "480x762@25" 11.79 480 512 552 584 762 779 783 801
Modeline "800x442@25" 10.51 800 832 864 896 442 452 454 465
#32px status bar (no need for rounding):
Modeline "320x448@50" 9.93 320 352 384 416 448 457 461 471
Modeline "480x288@50" 8.75 480 512 544 576 288 294 297 303
#24px status bar:
Modeline "240x376@50" 6.49 240 272 296 328 376 384 387 395
Modeline "400x216@50" 5.50 400 432 448 480 216 220 222 227
Modeline "240x296@50" 5.02 240 272 288 320 296 302 305 311
Modeline "320x216@50" 4.55 320 352 368 400 216 220 222 227
EndSection
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
#tablet resolution
Virtual 1024 768
EndSubSection
EndSection
Section "ServerLayout"
Identifier "dummy_layout"
Screen 0 "Default Screen"
Screen 1 "screen0" rightof "Default Screen"
Option "Xinerama" "1"
EndSection
然后重新启动 x 服务器并运行命令：
x11vnc -clip 1024x768+1280+0
但是重启 lightdm 后一切都崩溃了，我的屏幕（主显示器）黑了:)，之后我需要恢复我的 xorg.conf 文件。
有人能向我解释这里可能出了什么问题吗？
答案1
您有两个问题：首先，修复 xorg.conf 问题。启动后，转到虚拟控制台（tty3，Ctrl + Alt + F3）并尝试备份文件：mv /etc/X11/xorg.conf /etc/X11/xorg.conf_BKP-$(date -I)。
要使用平板电脑/手机扩展桌面：
书桌
Deskreen 可以将任何带有网络浏览器的设备转变为您计算机的辅助屏幕。
它以 .deb 或 AppImage 的形式提供。它将生成二维码以共享桌面屏幕或任何应用程序任何运行浏览器（并支持 WebRTC）的设备。
这里视频教程。