The previous kernal was 5.10, I have AMD Firepro + two monitors, the issue of black screen occured when I changed some settings on display or run gThumb. I had to reboot system by pressing power off button.
As upgraded to 5.15 kernal, the driver of display card has been changed as above listed. The problem should be solved. The system so far so good.
中文 
deepin 
Deepin System Updates (2022.6.15） 
原来的内核是5.10, 用一块AMD Firepro的独显+双屏, 经常有黑屏的问题, 要么是打开gThumb, 要么是调整显示设置, 就突然黑屏, 只能断开一个显示器再重启.
因为要解决黑屏的问题, 误打误撞地运行了"sudo apt install linux-image-deepin-stable-amd64 linux-headers-deepin-stable-amd64", 内核升级到5.15, 发现显卡的驱动也变化了, 似乎是降级了, 但是黑屏的问题应该是被解决了. 谢谢.
原来是: Device: AMD FirePro W2100 (OLAND, DRM 3.40.0, 5.10.83-amd64-desktop, LLVM 11.0.1) (0x6608)
现在是: Device: AMD OLAND (DRM 2.50.0, 5.15.6-amd64-desktop, LLVM 11.0.1) (0x6608)
The previous kernal was 5.10, I have AMD Firepro + two monitors, the issue of black screen occured when I changed some settings on display or run gThumb. I had to reboot system by pressing power off button.
As upgraded to 5.15 kernal, the driver of display card has been changed as above listed. The problem should be solved. The system so far so good.
Thanks.