多谢各位的帮助，现在问题已经解决了；

解决方法：1、我使用了两个视频线（一根DP，一根HDMI）连接同一显示器，组成了虚拟的双屏；

                  2、双屏策略是：整合屏幕，自定义复制，选择显示器的输入源为主屏幕。

存在的问题：如果有使用论坛的一个顶栏程序dde-top-panel的程序，在锁屏解锁后会有顶栏显示的问题，注销可解决。

个中缘由：无意之间在哔哩哔哩上看到一个关于显示器双输入的视频，就决定试试我的这个想法，欸哟结果还可以；不过这当中具体原理还不清楚，欢迎知道的大佬指教

--------------------------------------------------我是分割线-----------------------------------------------------------------------

求助论坛大佬，deepin总是出现如下的花屏（win10 20H2正常），但鼠标能动； ctrl+alt+f5 也不能切换到tty（有时手快可以切到tty重启lightdm，但是也用不了几分钟就又花屏了）；于是我

升级了内核，问题依旧；（内核一路从5.7到5.8再到5.9，最后到5.10）

卸载显卡驱动mesa，问题依旧；

切换低分辨率显示器，问题依旧；

然后找了一块ssd安装新下载的deepin20，auv~又花了；再重装，还是花；

啊西吧；下载一个manjaro20再装，开心不到两分钟，又和deepin一样花屏了。（ win10 20H2依然正常 ）

救救孩子吧，图在后面，还有我的硬件和驱动信息

补充：1、win10的“快速启动”是关了的；

           2、开机在grub选择界面选deepin按e添加nomodeset，进入桌面后不花；不过分辨率就只有1024×768了

           3、最近deepin和win10我都更新过，之前deepin也有花屏现象，不过非常少

(base) zhanfei@zhanfei-PC:~$ inxi -Faz
System:
  Host: zhanfei-PC Kernel: 5.10.0-051000-generic x86_64 bits: 64 
  Desktop: Deepin 20.1 Distro: Deepin 20.1 Beta 
Machine:
  Type: Desktop Mobo: Micro-Star model: B450M MORTAR TITANIUM (MS-7B89) v: 2.0 
  serial:  UEFI: American Megatrends v: A.00 date: 07/17/2018 
CPU:
  Topology: 6-Core model: AMD Ryzen 5 2600X bits: 64 type: MT MCP 
  family: 17 (23) model-id: 8 stepping: 2 microcode: 8008206 L2 cache: 3072 KiB 
  Speed: 1840 MHz min/max: 2200/3600 MHz Core speeds (MHz): 1: 1834 2: 1908 
  3: 2163 4: 2149 5: 2461 6: 2984 7: 1818 8: 1813 9: 3200 10: 3194 11: 3191 
  12: 3191 
  Vulnerabilities: Type: itlb_multihit status: Not affected 
  Type: l1tf status: Not affected 
  Type: mds status: Not affected 
  Type: meltdown status: Not affected 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 mitigation: Full AMD retpoline, IBPB: conditional, STIBP: 
  disabled, RSB filling 
  Type: srbds status: Not affected 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: AMD Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] driver: N/A 
  Display: x11 server: X.Org 1.20.4 driver: ati,fbdev 
  unloaded: modesetting,radeon,vesa resolution: 1024x768~76Hz 
  OpenGL: renderer: llvmpipe (LLVM 10.0.0 256 bits) v: 3.3 Mesa 20.1.2 
Audio:
  Device-1: AMD Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] 
  driver: snd_hda_intel 
  Device-2: AMD Family 17h HD Audio driver: snd_hda_intel 
  Sound Server: ALSA v: k5.10.0-051000-generic 
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  driver: r8169 
  IF: enp24s0 state: up speed: 100 Mbps duplex: full mac:  
Drives:
  Local Storage: total: 1.82 TiB used: 764.22 GiB (41.1%) 
  ID-1: /dev/nvme0n1 vendor: Gloway model: VAL240NVMe-M.2/80 size: 223.57 GiB 
  block size: physical: 512 B logical: 512 B 
  ID-2: /dev/sda model: HS-SSD-C160 256G size: 238.47 GiB block size: 
  physical: 512 B logical: 512 B 
  ID-3: /dev/sdb vendor: Western Digital model: WD10EZEX-08WN4A0 
  size: 931.51 GiB block size: physical: 4096 B logical: 512 B 
  ID-4: /dev/sdc vendor: Western Digital model: WD5000LPVX-80V0TT0 
  size: 465.76 GiB block size: physical: 4096 B logical: 512 B 
Partition:
  ID-1: / raw size: 80.00 GiB size: 78.24 GiB (97.81%) used: 22.89 GiB (29.3%) 
  fs: ext4 dev: /dev/nvme0n1p4 
  ID-2: /home raw size: 100.00 GiB size: 97.93 GiB (97.93%) 
  used: 44.06 GiB (45.0%) fs: ext4 dev: /dev/sdb1 
Sensors:
  System Temperatures: cpu: 52.9 C mobo: N/A 
  Fan Speeds (RPM): N/A 
Info:
  Processes: 331 Uptime: 1m Memory: 15.64 GiB used: 1.01 GiB (6.5%) Shell: bash 
  inxi: 3.0.32