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I’ve got a Lenovo ThinkCentre running Arch Linux. It’s connected to a display with a DisplayPort to HDMI cable, which only works sometimes (quite randomly). When it doesn’t, the display remains black, but it does receive a signal. Do you have any idea if this is a hardware, adapter, or software issue?

  • Do you have any other monitors? I remember I had a strange issue where a desktop would work with a 1080p VGA and 4K DP setup, but not a 1080p HDMI and 4K DP setup. – udlp Aug 15 '19 at 11:54
  • @udlp Unfortunately, I’ve got only one monitor. That’s kind of the problem: I don’t have enough hardware to test everything. But thanks for the tip, sounds like just another instance of adapter foo. – oioioi Aug 15 '19 at 12:03
  • Assuming you have a passive adapter (which I think you do, since you say it's a DP to HDMI cable), there's likely no adaptation taking place. Most DP sources like GPUs and iGPUs support pushing the HDMI protocol over DP, which means, as far as your computer is concerned, you have a simple HDMI to HDMI cable. I say likely, because technically they don't have to support HDMI over DP, but I've yet to find a device that doesn't. – udlp Aug 15 '19 at 16:36
  • @udlp Yes, it’s passive. Do you have any good active adapter in mind? – oioioi Aug 16 '19 at 14:54
  • No, sorry. I'm just trying to rule out what could be the cause, and explaining how DisplayPort is weird. You'll have to wait for someone else to think of the right cause. – udlp Aug 16 '19 at 15:23

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