U2721DE, can't choose Auto Select input source?

Question

As title says, I'm using a U2721DE monitor and I can't activate Auto Select. The menu allows choosing USB Type-C, DP, or HDMI. 'Auto Select', Auto Select for USB-C and Reset Input Source are all greyed out. I want to share between two PCs, one on USB Type-C and the other on HDMI. But it's quite annoying changing the input manually (turn off from standby, turn on, activate menu, etc.) What do I need to do to enable the Auto Select mode? I didn't see any clues in the manual. Firmware version M3T103.

abstruse_goose · Accepted Answer

I disabled DP 1.4 by following these steps from the manual and now I can choose Auto Select? Weird but OK.

DELL-Chris M · Answer

Interesting. What are the video cards/GPUs in both PC?

user_88d9ff · Answer

@abstruse_goose​ , thank you, I had the same problem and this fixed my issue by pressing 8 seconds and selected DP 1.2 (in my case)

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