Hard Crash when attaching external monitors using KVM

[erahhal]

Hyprland Version

System/Version info

Hyprland, built from branch  at commit 754eaf5b8b65c9764abe67ec2d599036cd51e381  ().
Date: 2024-01-24
Tag: 

flags: (if any)

Bug or Regression?

Bug

Description

I've got two external 4k monitors using DP and flip back and forth between two laptops using a KVM. The laptop with Hyprland crashes on occasion when flipping back to it.

Crash log attached. hyprlandCrashReport6786.txt

How to reproduce

Not sure. Here's my setup:

2 LG IPS 4K@60Hz IPS monitors Level1Techs Dual Monitor KVM using Display Port Machine 1: Dell XPS 9560 running Sway Machine 2: Lenovo Thinkpad X1 Carbon 11th Gen running Hyprland

Thinkpad is connected to KVM through a Thinkpad Thunderbolt 4 dock. Both monitor cables are connected to the dock.

Kanshi is used to update layout and resolution on detection of output changes.

I'll be using the Dell for a while, come back to the Thinkpad, and the screen is black and the keyboard is locked, including caps lock. After 20-30 seconds it exits and goes back to the login screen.

This only happens occasionally.

Unclear if this is due to the KVM, the Thunderbolt dock, the change in external outputs, Kanshi, or all of them.

Crash reports, logs, images, videos

hyprlandCrashReport6786.txt

[1over137]

I have a similar setup and I've also been noting a lot of crashes since i updated to ded174d6e5d. Occasionally running kanshi directly causes a crash. I have a desktop monitor which I connect my laptop to, and it crashes if I remove the cable while the laptop lid is closed, upon resuming from a suspended state. I'll try to find a way to find a better way to reproduce this and report back.

[1over137]

Ok, I was able to reproduce this reliably by using unplugging the desktop monitor with kanshi running and I did a git bisect.

https://github.com/hyprwm/Hyprland/commit/7b3d03938888f399c3c14adfce73ea22bbe461ea is the first bad commit

Unfortunately I don't have enough time or familiarity with the code to fix this myself for now. Hopefully @vaxerski takes a look at it.

[1over137]

Relevant kanshi config

profile {
	output eDP-1 disable
	output DP-3 enable mode 2560x1440 scale 1

}

profile {
	output eDP-1 enable scale 1
}

[erahhal]

Perhaps a coincidence but I also disable eDP-1.

[alexandru0-dev]

Ok, I was able to reproduce this reliably by using unplugging the desktop monitor with kanshi running and I did a git bisect.

7b3d039 is the first bad commit

Unfortunately I don't have enough time or familiarity with the code to fix this myself for now. Hopefully @vaxerski takes a look at it.

had the same exact behavior happening to me. thxx for finding the bad commit, hopefully it's going to get solved. EDIT: works with 0.34.0 perfectly

[alexandru0-dev]

Perhaps a coincidence but I also disable eDP-1.

the idea is that Hyprland crashes due to no monitor available. So disabling the eDP-1 is causing the "issue".

[erahhal]

I've upgraded to 0.34.0, and I haven't seen a crash yet, but I've seen the screen go fully red and had to go to a TTY to kill everything and relaunch. Mouse still moved.

[vaxerski]

red screen of death = lockscreen died

you can get around this by enabling restoring lockscreens in config and having a locked bind to launch swaylock or whatever lock

[vaxerski]

I'll say this is a dupe of #4628