I've got a Dell XPS 13' (9350), with a Dell USB-C to HDMI adapter, connected to a screen. I'm running NixOS with XMonad. The screen (set to HDMI input) shows "no input signal" despite:

  • xrandr showing the screen as "connected", with expected resolution (xrandr)
  • kernel version 4.4.8 should support Skylake processor (uname -a)
  • lsmod shows i915 as being loaded (lsmod | grep i915)
  • screenshots show the second screen, including windows

I don't think the second screen shows up in lshw, but then how can xrandr see it? I'm not sure where to look next. I hope anyone here does.

EDIT: I just found out that a VGA cable connected to the same adapter does work.


I purchased a second USB-C to HDMI adapter, and everything works perfectly with it. Conclusion: The first adapter I had is broken.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.