It is not the first time I describe the issue. Instead of remaining steadily turned off, the screen is turning on and off.
The issue occurs randomly, and I can't find any trace of it in any log. Lately it did turn on and off for hours at intervals of about 10 min. And it did so before reboot and after reboot. (after reboot: user logged but no application specifically running) As you can understand it is really infuriating: flashing lights are usually not synonymous of quietness. As I already described, the setting is a 4K Dell monitor on display port, on a lid closed X230. And no, I can't just turn the screen off with the power button, because if I do so, kde freaks out and when I turn the screen back on the resolution for one thing, is so far away from initial settings, that I just can't see a thing; and also, it takes me hours to put back the settings right. I can't even keep the lid opened, because at that resolution, additional screen would be too much load for the gpu. That might be a little bit out of topic, because it is not specifically kde related. But I think Gnome is using Wayland. And I've found nothing about this sort of issues on the web. And it is not debian stable neither. irc seems a thing of the past... matrix.org debian-next is not working yet. xorg had never ever answered any question. I could make a bug report, but I don't know against what exactly. Only answer I've had, so far is "dpms and x11 are a crock of shit together, and web browsers are hilariously unpredictable actors in the x11 ecosystem" But I haven't found similar comments on the net. And it is not really hinting to any course of action. And again, I haven't been able to associate any traces of the malfunctioning with any logs: nothing specific seems to be recorded in the logs when the screen is flashing like a Christmas tree. I'm using rsyslogd and SYSTEMD_LESS=FRXMK journalctl -xa seems to show me everything there is. I haven't seen anything relevant in /var/log/Xorg.0.log Worth mentioning: I put the pc to sleep with: (the screen that is [*]) xset dpms 10 10 10; sleep 10; xset dpms force off Then "C-l" Then after entering my password: xset dpms 1800 2700 3600 But I don't thing it really influences the flashing effect; only the frequency of the flashing. Again, 9 times out of 10, it doesn't flash at all be behaves itself, like a good pc. [*] I cannot put the PC to sleep, nor suspend... I can, but it's complicated, and I don't think it works well. Because to restart the laptop, I'll have to make some event. But the lid is closed. So I'd have to manipulate the lid, but then kde will see that as a dual screen configuration, and it will freak out, and I will loose all my screen settings. When I restart the PC, I have to make a special dance: Open the lid; Press power button; Wait for grub screen... Then, at that moment, and that moment only, close the lid! Can you imagine the hassle. There must be much better solutions that I missed; only, I haven't found them yet.
