Join Log in
Score:0
amziraro avatar Ubuntu

How do I lock my computer and keep the screen black?

bt flag
amziraro

I use my Ubuntu machine as a media computer, sometimes I lock it and walk away which normally blacks the screen and then after a few seconds stops sending signal to the monitor/TV. When the screen is fully black, my TV turns off the backlights and is for my purposes off. However, when there is no signal, I instead get the TV's "no signal" prompt, which turns on the backlight.

I want to lock my screen with Ctrl-L and have the screen go black, but never actually stop sending the black screen signal to the TV/monitor, so that appears off but isn't actually. I want to prevent the TV from showing the "no signal" prompt by having Ubuntu continue to send a black screen to the TV when its locked.

I don't want to use DPMS to turn the monitor on/off on demand as my TV isn't reliable at turning back on. I'm using Intel graphics on an i5-2500k running Ubuntu 21.10 with the TV running over HDMI.

45
0 + 0
ChanganAuto avatar
us flag
ChanganAuto
There's a fundamental misunderstanding in the way you wrote this question: There is no "black screen signal" being sent, ever. There's a fraction of a second, at most, when the desktop has been turned off but the video output not turned off (capacitors an all) that is *interpreted* by the TV as signal. In a nutshell what you want can't be done because it simply doesn't exist.
0
Reply
amziraro avatar
bt flag
amziraro
Maybe it would be easier if I framed the question as something like "how do I make the lockscreen just show black until I move the mouse". All I want to do is send a screen full of black pixels instead of turning off the output, that's what I mean by black screen signal.
0
Reply
ธงชาติไทย
Elon Musk
I sit in a Tesla and translated this thread with Ai:

mangohost

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.