hyprland crashes when i suddenly disconnect my external monitor

[abbood]

Trigger: USB device disconnect (Apple USB-C hub with external monitor)

CRASH LOCATION:

Function: CInputManager::onTouchDown (touch input handling)
Component: Input Manager
STACK TRACE:
#0 abort (libc.so.6)
#1 Hyprland + 0x2b0a48
#2 Hyprland + 0x1cf20c
#3 CHookSystemManager::emit
#4 CInputManager::onTouchDown <-- CRASH HERE
#5 libaquamarine (session handling)
#6 Wayland event loop dispatch

SEQUENCE OF EVENTS:

External monitor (DP-1) connected via USB-C hub
USB hub disconnected: "usb 3-1: USB disconnect"
Touch input event triggered during disconnection
Hyprland crashed in touch input handler
All input stopped working (compositor dead)
HARDWARE:

Laptop: HUAWEI VGHH-XX
Display: eDP-1 (3120x2080@120) + DP-1 (2560x1440@60)
Touch device: ICNT9288:00 7F7F:9288
USB hub: Apple USB-C (device 3-1, 3-1.2)
HYPRLAND VERSION:
Hyprland 0.52.1 built from branch v0.52.1 at commit 967c3c7 clean (version: bump to 0.52.1).
Date: Sun Nov 9 23:31:36 2025
Tag: v0.52.1, commits: 6564

Libraries:
Hyprgraphics: built against 0.3.0, system has 0.3.0
Hyprutils: built against 0.10.1, system has 0.10.1
Hyprcursor: built against 0.1.13, system has 0.1.13
Hyprlang: built against 0.6.3, system has 0.6.3
Aquamarine: built against 0.9.5, system has 0.9.5

no flags were set

[ronilaukkarinen]

Confirmed since 0.50 or so, current version: v0.52.0-19. For me it's enough just to turn off display. On turning back on I see gdm login screen. Dupe.

[abbood]

i figured out why this is happening:

When I hvae have external-only:

• Laptop screen disabled
• Unplug HDMI → zero displays active
• Hyprland panics/crashes (no output to render to)

When I have both displays (laptop and external monitor)

• Both screens active
• Unplug HDMI → laptop screen still active
• Hyprland happily continues on laptop screen
• No crash

so I created this script using hyprmon for now (the key part is that it keeps the display on but it trurns it off using hyprctl dispatch dpms off eDP-1

#!/bin/bash

# IMMEDIATE logging - write BEFORE anything else
echo "[$(date '+%Y-%m-%d %H:%M:%S')] ========== SCRIPT STARTED ==========" >> "$HOME/.local/share/hyprmon-daemon/switch.log"

# Logging setup
LOG_DIR="$HOME/.local/share/hyprmon-daemon"
LOG_FILE="$LOG_DIR/switch.log"
mkdir -p "$LOG_DIR"

# Function to log with timestamp
log() {
    echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" >> "$LOG_FILE"
}

log "========== AUTO-SWITCH TRIGGERED =========="

# Log DRM states BEFORE anything
log "DRM device states BEFORE any action:"
for dp in /sys/class/drm/card1-DP-*/status /sys/class/drm/card1-eDP-*/status; do
    status=$(cat "$dp" 2>/dev/null)
    enabled=$(cat "${dp%status}enabled" 2>/dev/null)
    log "  $dp: $status (enabled: $enabled)"
done

# Wait for displays to settle
sleep 2

# Use Hyprland's actual monitor detection
HYPR_MONITORS=$(hyprctl monitors -j 2>&1 | jq -r '.[].name' 2>&1)
log "Hyprland detected monitors: $HYPR_MONITORS"

# Check if external monitor (DP-*) is in Hyprland's monitor list
if echo "$HYPR_MONITORS" | grep -qE "^DP-[0-9]"; then
    PROFILE="both-displays"
    log "Decision: External monitor detected -> Applying profile: $PROFILE"
    hyprmon --profile "$PROFILE" >> "$LOG_FILE" 2>&1
    
    sleep 1
    
    # Move ALL workspaces from laptop to external before turning it off
    log "Moving workspaces from eDP-1 to DP-1..."
    WORKSPACES_MOVED=0
    hyprctl workspaces -j | jq -r '.[] | select(.monitor == "eDP-1") | .id' | while read ws; do
        hyprctl dispatch moveworkspacetomonitor "$ws" DP-1
        log "  Moved workspace $ws to DP-1"
        WORKSPACES_MOVED=$((WORKSPACES_MOVED + 1))
    done
    log "Moved $WORKSPACES_MOVED workspace(s)"
    
    # Now turn off eDP-1 (OLED protection)
    hyprctl dispatch dpms off eDP-1
    log "DPMS off for eDP-1 (OLED protection)"
    
    notify-send "Monitor" "Switched to: External (OLED off)" -t 2000
else
    PROFILE="laptop-only"
    log "Decision: No external monitor -> Applying profile: $PROFILE"
    hyprmon --profile "$PROFILE" >> "$LOG_FILE" 2>&1
    
    sleep 1
    
    # Turn laptop OLED back on
    hyprctl dispatch dpms on eDP-1
    log "DPMS on for eDP-1"
    
    # Restore brightness
    brightnessctl set 336
    log "Restored laptop brightness to 336"
    
    notify-send "Monitor" "Switched to: Laptop Only" -t 2000
fi

log "========== AUTO-SWITCH COMPLETE =========="
log ""