Folks, I have a desktop running Debian 11 with two monitors connected via Display Port to my Nvidia graphics card. I have something of an issue with power save. I haven't configured any power saving, although it uses the standard X settings, which I believe is standby/poweroff/etc all set to 300 seconds. This works find and after five mins or whatever it is the monitors go into power save, though generally, if I'm moving away from the computer for a while I'll hit the power switch.
The issue comes when I return. If I turn the monitors back on and then move the mouse, everything powers back on. If I happen to move the mouse before powering on the monitors, they do not come out of power save. I beleive this is to do with X being able to detect the presence of the monitor and if it seen no monitors (because they are powered off), then it disables them. I haven't found a way out of this mess, other than to SSH into the host and reboot. It's interesting that X doesn't appear to care abou the monitors going off/on. Turning one off doesn't cause the display to shift to the remaining monitor. It only appears to happen after X has gone into powersave. It's also worth adding this is all hyphthosis, I haven't fully confirmed it to be the cause. I have read of similar things happening and people getting around it by masking the power detect pin on the display cable, although this seems a little bit of a messy fix. Especially given it's reportedly a lot more fiddly to do on a Display Port cable. Anyway, can anyone offer any advice on this situation? It it possible to configure X to ignore the monitor power state? Is there any way to recover the situation without having to blindly reboot? Have I totally missed something and the cause of this mishap actually something I haven't considered? Any assistance would be appreciated. Regards, Mike.
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