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#1 2018-11-10 08:44:52

Storm
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From: Hungary
Registered: 2014-09-12
Posts: 96
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Plasma: Second screen goes black during splash screen

Hi!

So I got a second screen weeks ago, and after defining it in my Xorg config it worked as expected. Then a few days ago this started:

During boot, a few seconds after the Plasma splash displays on both screens, the second one goes black. It still has signal, just doesn't display anything. The only way I found to fix it is by switching to another TTY and then back.

However, many times a few seconds after Plasma comes back the second screen goes black again. I usually have to repeat this 2-3 times until it sticks - today it took 8. Even worse, every time I do it there is a chance the whole PC will freeze up forcing me to hardware reset.

Didn't attach any logs because I don't even know what to look at.

I just found this old thread describing the same phenomena with KDE 4, but no idea if the causes are related: https://forum.kde.org/viewtopic.php?f=66&t=119728


Any ideas? Thanks in advance!


"Sic itur ad astra per aspera."

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#2 2018-11-11 10:21:42

Storm
Member
From: Hungary
Registered: 2014-09-12
Posts: 96
Website

Re: Plasma: Second screen goes black during splash screen

This drives me mad... This morning I had to hardware reset the PC FOUR times because of this. sad

Here is my Xorg log from just after Plasma finished loading and the second screen is still black:
https://pastebin.com/pfM9nENF

Sadly I couldn1t get the log from after switching desktops to fix it because it froze the PC every time, and after the 4th reset the second screen didn't go black and I just left it that way so I can finally use the PC. Also, tried of suspending composition has any effect, but it doesn't.


"Sic itur ad astra per aspera."

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#3 2018-11-11 12:41:27

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 5,574

Re: Plasma: Second screen goes black during splash screen

Can you post your xorg config? FWIW if you are setting up your screens statically within a xorg.conf anyway, you might want to disable KDE's kscreen daemon, as that might bite itself with your static setup.  Also FWIW post a journalctl -b while reproducing the issue.

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#4 2018-11-11 14:41:17

Storm
Member
From: Hungary
Registered: 2014-09-12
Posts: 96
Website

Re: Plasma: Second screen goes black during splash screen

Screen config under xorg.conf.d: https://pastebin.com/5HavfBsf
Output of journalctl --boot=-1: https://pastebin.com/bumTzQFP

Kscreen stopped interfering once I added the Xorg config so I left it alone because I may need it in the future. And as said, that worked for weeks without issue. I just uninstalled kscreen now, we will see if that makes a difference.


"Sic itur ad astra per aspera."

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#5 2018-11-12 10:03:39

Storm
Member
From: Hungary
Registered: 2014-09-12
Posts: 96
Website

Re: Plasma: Second screen goes black during splash screen

Fresh logs from this morning:

Xorg log: https://pastebin.com/pZf04U0V
Journalctl -b: https://pastebin.com/VhD3hXAY

Deleting kscreen didn't fix the issue but it screwed up my screen arrangement. Despite being defined in my conf file, my second screen is again placed on the right of my main instead of the left where it should be. sad But this is likely unrelated. Plasma is just a piece of crap when it comes to handling more than one screens. The fun thing is, installing kscreen again made my screens instantly snap back to their proper place. Huh...

Last edited by Storm (2018-11-12 10:05:39)


"Sic itur ad astra per aspera."

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#6 2018-11-12 16:09:06

Storm
Member
From: Hungary
Registered: 2014-09-12
Posts: 96
Website

Re: Plasma: Second screen goes black during splash screen

Sorry to bump the thread but I'm getting desperate. This morning it took like 6 tty switch to get it work, now it took 9, it takes more every time.

And I don't even know where else to post because I don't know what component has the problem. Xorg? Xrandr? Plasma? nVidia? Something else? hmm


"Sic itur ad astra per aspera."

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#7 Yesterday 10:21:00

Caspian
Member
Registered: 2007-05-22
Posts: 232

Re: Plasma: Second screen goes black during splash screen

I'm not sure if this is related but I started having issues with second monitor (external monitor is primary and laptop monitor is secondary for me) in plasma several days ago (I believe that this started happening after upgrade of KDE Frameworks to version 5.52.0).
I don't have issues with splash screen, however I have constant graphic artefacts on secondary (laptop) screen and applications freeze on it (especially Chromium). I'm using Intel graphics card only. I wasn't able to detect the culprit unfortunately.

Last edited by Caspian (Yesterday 10:21:44)

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#8 Today 09:45:30

Storm
Member
From: Hungary
Registered: 2014-09-12
Posts: 96
Website

Re: Plasma: Second screen goes black during splash screen

Caspian wrote:

I'm not sure if this is related

So... literally all of your symptoms are completely different, including the time it started happening... No, I don't think they are related. neutral


As for me, things just got real weird... I start to think it maybe a video card/driver or monitor issue.

So few days ago I reorganized my cables while the PC was off, re-plugging everything, and this made no difference. However, after turning on and the black screen happened again, I thought let's try unplugging and re-plugging the HDMI cable of the affected screen. This fixed it.

After that for a few days, the monitor just worked properly, the issue didn't happen again.

Then since yesterday, a slightly different issue started happening: Before X even starts, the second monitor keeps turning on and off constantly. It's on for just a moment, I can see the image it should display for a blink, then it turns off, and this repeats infinitely until I re-plug the HDMI cable again.

Also, I did a system upgrade sometimes yesterday, I believe this new issue started after that, and I also believe there was an update to the nVidia blob.

Fresh logs from this morning, including the re-plugging of HDMI to fix the on and off screen:
Xorg log: https://pastebin.com/yf3NB6pb
Journal: https://pastebin.com/KjwwySYx


"Sic itur ad astra per aspera."

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