Looking at the logs again, I guess I misunderstood your problem. You’re only seeing 2 monitors connected on one gpu while 3 are physically connected. I guess this comes from the fact that you’re using passive DP to HDMI 2.0 converters. I don’t really know if the gpu supports more than 2 hdmi devices, does this also occur if you connect at least one real DP monitor?
Does the missing monitor show up if you disconnect any of the other displays? I.e. try booting with just the non-working monitor connected and see if it shows up, and then if it does, start adding back other monitors before booting one at a time to see if adding a particular one causes the other to stop working.
I’ll give that a shot now and reply shortly, but I wanted to add that when I was playing around with this last week, the monitor that doesn’t work would move after a reboot. Also, the main monitor that displays POST also moves when rebooting.
So in the current config, monitor 2 was not working. I unplugged the others and rebooted but monitor 2 still didn’t work. So next I moved monitor 2 from the second port on the first card, to the first port and that monitor started working.
Next I plugged a monitor into the second port (where monitor 2 was) and rebooted. When it came up, the monitor in port 1 was seen and working, but the monitor in port 2 was not seen by nvidia-settings
I edited that last sentence it was incorrect before.
Sorry, my last message doesn’t make sense, let me try once more:
I booted with just monitor 2 plugged into port 2 and it did not work. I moved monitor 2 to port 1 and it worked. I added monitor 1 to port 2 and rebooted but monitor 2 in port 1 doesn’t work, even though port 1 worked before.
So right now I have two monitors plugged in but only one is seen.
No, that’s what I was asking for. Basically to narrow down whether the problem is with one specific monitor, HDMI dongle, or cable, or if the problem is specific to a particular port on the GPU and depending on which other devices are attached.
I’ll file a bug and see if I can find someone to try this combination of devices.
Yeah, that’s definitely interesting. These monitors are all identical, right? There must be something interesting about monitor 2. Are all of the settings in the OSD the same across these monitors? Also, if there’s a way to check can you please see if they all have the same firmware version?
Yes, all of the monitors are the same. However, I just made a slight break through…
I disconnected monitor 2 and in its place I connected a Dell monitor using mini-dp to standard dp and now I have 5 monitors. Next step is to add monitor 2 back in and see if it works. Be right back.
So now powering it up with 6 monitors (5 asus hdmi and 1 dell DP) and monitor 2 still doesn’t work. As one last test, I unplugged monitor 1 and plugged monitor 2 in its place and now monitor 2 is working as well as the other 4.
So I’m not sure what that means. I believe it means all of the hardware is working (monitors, cables, converters) but I just can’t have 5 asus monitors? But I can have 4 asus and 1 dell? Or is it that I can’t have 5 HDMI monitors? 4 HDMI and 1 DP seem to work. Asking because I have to explain all of this to someone else.
EDIT: Even though monitor 2’s light was blue, it was not listed in nvidia-settings when I checked further. So I put monitor 3 back in place and its working.
EDIT2: I think its a bad converter. When I switch adapters monitor 2 works fine. The weird thing is that converter works fine when its the only monitor connected.
EDIT3: It was a bad mini-dp to HDMI. I’m not sure why it worked fine when used without the other monitors, but replacing it fixed the issue. Thank you for all of your help! I learned a few good things here. Sorry for all of the edits, but it says I can’t post again until tomorrow.
Thanks for getting to the bottom of that! It’s still weird that it worked as the boot display but not after the driver loads, but these kinds of adapters can be really flaky in general so I think we can just chalk it up to the adapter being quirky.
I cleared the “new user” flag in the admin panel so you should be able to post normally now.