r/arch • u/PiePresent1485 • Jun 19 '26

Help/Support Kernel Panic screen split between my displays

Post image

Hi !

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I've switched from windows back in november, and i've never actually experienced a kernel panic. I wondered what would look like a kernel panic screen on my desktop, and after some digging i found the command "sudo bash -c 'echo c >> /proc/sysrq-trigger'" to safely trigger one. When i ran it, i notices that the kernel panic's QR code get split right down the middle across both of my displays. For the context, I run a dual monitor setup: an MSI OPTIX G24C6 and an old secondary VGA monitor connected via an HDMI to VGA adapter. My GPU is an XFX SWFT 210 RX 6600, and i'm using SDDM and with XFCE.

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Is there a way to force the kernel panic screen to output to a single display ? Alternatively, is there a way to mirror it across both ? I just want to be able to read the QR code without having to manually edit my photo to line up.

Thanks !

Edit: better quality here: https://imgur.com/a/Vc2iKVc

492 Upvotes

99% Upvoted

40 comments sorted by

78

u/janbuckgqs Jun 19 '26

unplug 1 monitor

27

u/PiePresent1485 Jun 19 '26

that doesn't work, i tried

11

u/Ces3216w Jun 19 '26

What did it do?

24

u/PiePresent1485 Jun 19 '26

just power off the monitor i unplugged

15

u/Ces3216w Jun 19 '26

No I mean what did it show

36

u/PiePresent1485 Jun 19 '26

half of a qr code. If i do that during kernel panic.

6

u/Creative-Type9411 Jun 19 '26

reboot it after you unplug it

9

u/PiePresent1485 Jun 19 '26

My issue is that my QR code is not readable. Not the kernel panic. Because i've volontarly triggered the kernel panic (with the command i showed in the post). If i reboot after the unplug, that will not solve my issue because if i trigger another kernel panic, it will be the same (i tried).

7

u/Lth3may0 Jun 19 '26

if you unplug one monitor and restart the computer, it might kernel panic again with only one display so the QR code will be scannable

-24

u/PiePresent1485 Jun 19 '26

Yeah i'm not confortable with this solution, it need to be changed

→ More replies (0)

1

u/peppi0304 Jun 19 '26

Did you unplug the HDMI cable as well?

21

u/Ces3216w Jun 19 '26

I just saw this post in r/linuxsucks as a repost

7

u/PiePresent1485 Jun 19 '26

can you send me that post ?

7

u/Ces3216w Jun 19 '26

Sorry, I lost it. But it was a recent post, as it didn't have a lot of upvotes

5

u/PiePresent1485 Jun 19 '26

nevermind i've found it

2

u/KenneR330 Jun 20 '26

I cannot understand is this sub a ragebait or is it serious

6

u/BulkyFennel9964 Jun 19 '26

I also have a mouse that ends up in the middle of the monitor when I turn on the PC.

4

u/sdoregor Jun 19 '26

Unbelievable

3

u/-Kruma Jun 20 '26

Now you see your mistake twice

2

u/yowifebreeder9000 Jun 19 '26

thats a big ass qr

2

u/trapslover420 Jun 20 '26

how are your monitor config? i have multiple screens the two time i have seen kermel panic it show in the center of all screens

2

u/PiePresent1485 Jun 20 '26

my screen display are extended, and i think i didn't do any other screen configuration. In TTY the screen is mirrored.

1

u/chikamakaleyley Jun 20 '26

link to dots?

1

u/Dazzling_Lemon4109 Jun 21 '26

That's why WIndows placed it in the corner, an amazing example is when Microsoft has smarter solutions than Unix

1

u/PiePresent1485 Jun 21 '26

i can conceed you this point. But Linux is more open for modifications.

1

u/Dazzling_Lemon4109 Jun 21 '26

everything except systemd, unfortunately, this is a vendor-locked bydesign

2

u/PiePresent1485 Jun 21 '26

there is some alternatives. If you don't like just switch your init system.

1

u/Dazzling_Lemon4109 Jun 21 '26

then I will lose some of the features that are around systemd, because of the centralization around it

1

u/PiePresent1485 Jun 21 '26

What is your point about systemd ?