Mac mini M4 loses HDMI display after KVM switching
A is being used alongside a Windows work laptop through a UGREEN HDMI , model AK502. When the starts while the KVM is already switched to the Mac, the Dell monitor shows the display normally.
After switching the KVM to the Windows laptop and then back to the , the monitor shows "HDMI not detected" and does not find the Mac display. UGREEN says this KVM works with macOS and does not need any driver, but this setup is not working reliably in practice.
The display settings have already been checked without finding a fix. A USB-C-to-HDMI with an HDMI dummy plug was also tried, but it did not solve the problem.
Key points
- The setup uses a , a Windows laptop, a Dell monitor, and a UGREEN HDMI AK502.
- The Mac display works when the boots while the KVM is already set to the Mac.
- After switching away to the Windows laptop and back again, the Dell monitor reports no HDMI signal.
- UGREEN says the KVM supports macOS and needs no driver, but this setup still fails after switching.
- A USB-C-to-HDMI plus an HDMI dummy plug did not fix the issue.