[ARM] QT app && retroarch sdl run, but no image

Hello everyone, I used cross compilation to port the RA simulator to the arm platform, but now I am encountering a very difficult problem when running it.

各位前辈好，我用交叉编译将RA模拟器移植到arm平台上，现在运行遇到一个很棘手的问题.

The problem is that when I run the QT application, the RA emulator can no longer run the display normally. Only by restarting the machine can the display run normally. However, if I repeatedly start and close the QT program or RA emulator separately, it can run the display normally. As long as there is a cross running change that makes the RA emulator unable to run the display normally, the video driver I use here is SDL, and I suspect it is related to SDL, May I ask if you can provide some help or ideas?

这个问题是：当我运行过QT应用程序后，RA模拟器便再也无法正常运行显示，只有重启机器才可以正常运行显示，但我单独的反复启动关闭QT程序或者RA模拟器，都是能够正常运行显示的，只要一有交叉运行变使得RA模拟器再也无法正常运行显示，我这里使用的视频驱动是sdl，我怀疑和sdl有关，请问各位能否提供点帮助或思路？

The issue names no files, tests, or entry points. Start by reproducing the sequence of running the Qt application and RetroArch on ARM with the SDL video driver, then inspect the SDL display interaction; done means identifying the cause and verifying that display output recovers without rebooting.