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While logged in, screen suddenly goes black, have to reboot

asked 2016-02-25 14:11:37 -0500

knl gravatar image

Three different times now, when I was past boot, logged in, and several hours (or days? who knows) into a "session," my screen suddenly went black. Well, very dark gray. I am running Fedora 23 Workstation. It is not the computer suspending or hibernating and failing to respond to subsequent keyboard or mouse input, as I will be actively working with the computer when this happens. All posts I've come across re: black screen and fedora have to do with boot issues, it seems, so I'm not sure where to start.

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answered 2016-02-25 14:39:15 -0500

sideburns gravatar image

Welcome to ask.fedora! The first thing we need to do is find out if it's software or hardware related. One way to do this is to activate the Magic Sysrq Key and see if you can use it to (If nothing else, it can let you do an orderly reboot, rather than simply power-cycling it.) get control. To have it active at all times, follow these instructions then reboot, and test it. Not all computers respond the same way, so you need to find out just which set of keys works before you need it. If it only works during testing, but never when you need it, it's probably hardware. Please keep us informed and let us know if you need more assistance.

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It seems to work sporadically but I've established I can reboot via the magic sysrq key in "testing" mode. More tbd later ...

knl gravatar imageknl ( 2016-02-25 18:02:39 -0500 )edit

Good. Now, let's see if it works when your box locks up.

sideburns gravatar imagesideburns ( 2016-02-26 02:16:47 -0500 )edit

So, when this happened again, I was able to reboot using magic sysrq + b, so I'm looking at a software issue?

knl gravatar imageknl ( 2016-02-26 13:51:22 -0500 )edit

That would be my guess. If it were hardware, such as a dodgy connection or a heat-sensitive joint, it's unlikely that it would recognize or respond to the signal.

sideburns gravatar imagesideburns ( 2016-02-26 13:58:40 -0500 )edit

What's my next step? What sort of software issue could cause this to happen?

knl gravatar imageknl ( 2016-02-26 15:09:58 -0500 )edit

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Asked: 2016-02-25 14:11:37 -0500

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Last updated: Feb 25 '16