OS version : Win10 Enterprise (21H1), 19043.1165
Driver date: 2021/6/10
Driver version: 27.20.14540.8001
The cable is HDMI2.0. There is no 3840 x 2160 (60hz) on the support list.
I tried to install old version driver, but didn't work.
The maximum resolution supported by the Radeon 520 is 4096x2160 @60 hz.
Are you using some sort of DP to HDMI/VGA/DVI adapter?
Need to know your computer information to get a clearer picture of your system and how to troubleshoot it.
Thanks for reply.
I'm not use the adapter.
I fix this , I use the Nvidia Geforce GT-730 , and installed the old version driver.
The GT-730 can't support RGB color mode, only YCbCr420(60hz), but enugh to me.