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Sometimes get a black screen before login on booting

gmcamposano

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Feb 6, 2021
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I have noticed that randomly, on one of power ups of the computer, the screen goes black, the external monitor goes to the mode where there is no information being sent (like its disconnected). The only thing that solves it is me pressing the power key for a few seconds and turning back on the computer. That solves the issue.
But why I am getting these black screens. I have noticed googling that other people get it too, but no one has a definitive fix. Does anyone here suffer from those? How can I fix this?
 

derpOmattic

Pop!_Muse
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Look at your logs and see if there's any obvious errors you can search for. First try journalctl -b 0. This will give you logs since boot. Or journalctl -b -1 will show the log of the previous boot. if there's too much output, pipe it to less and scroll down with arrow or page down.

You can also try journalctl -xb -1 | less. The x option showing kernel messages similar to dmesg. You could look at the dmesg logs from last session in /var/log/.
 
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gmcamposano

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Sorry for this newbie question but... what should i look for? There are so many lines which i cannot figure out which ones are errors and which aren't. I guess the ones in red are the errors right?
 

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