We connect with a remote desktop application (NoMachine) to a Leap 15.6 host. The connection works fine. When we turn off the physical monitor on the host the remote connection immediately become very laggy. The system isn’t usable in this state. Turning the monitor back on immediately restores the frame rate.
Environment: leap 15.6, sddm, kde, x11, nvidia
The problem has been seen with Leap 15.6, while it works fine with Leap 15.4 on the same hardware
Searching for “NoMachine slow monitor off” gave me >5 hits on the nomachine forum that seems to be the same problem, for example:
https://forum.nomachine.com/topic/poor-performance-when-host-screen-is-off
Likely the nomachine version is also updated going from 15.4 to 15.6, it looks to me that is the most likely reason for this laggyness.
Thank you for the reply.
I have been in contact with the nomachine support and they say it is nothing they can do on their side, its up to the behavior of the graphics card and the system configuration when the monitor is turned off. Their reply would imply that the issue is not specific to their software, but other remote desktop solutions as well. Just wanted to check if someone have had similar experiences.
I experience the issue with the latest released version of nomachine unfortunately, and Leap 15.6 is not exactly bleeding edge Linux, so there shouldn’t be a support issue I think.
@LesserBabkaX On headless systems in the past, I’ve attached a HDMI-VGA adapter which simulates a monitor attached…
Thanks Malcolm! These systems have monitors attached, so they’re not headless, its just that sometimes a monitor might be turned off and it will be a bummer for whoever tries to connect remotely. Nomachine offers a dummy dongle doing the same thing. Perhaps that solution could be combined with actually having a monitor?
Anyhow, what actually happens with the system when the monitor is turned off, or in a headless system? Is there some sort of power management going on? This is what I’m really curious about, since then maybe the settings for that could be adjusted.
Maybe nvtop might yield some useful info (under the two different scenarios)?
@LesserBabkaX Are these newer monitors? How are they connected, VGA, HDMI or DP?
That looks like a very interesting utility, will have a look at it. Thanks!
Not brand new, but not old either, a few years old. It is connected with dp. I tried it with another monitor model and then I did not have the same problem when turning it off, so it seems to be hardware dependent.
This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.