Focus randomly switching to external HDMI TV

[leovingi]

Basic description of the issue: I have 1 monitor and an external TV, both connected with two HDMI cables, no splitter. I have setup my configuration to have 5 workspaces - 1-4 are for the monitor, workspace 5 is dedicated to the external TV. But every now and then the focus will randomly switch to workspace 5, taking me away from whatever it was that I was doing on the other workspaces. It doesn't happen on a schedule, sometimes it might not happen for an hour, sometimes it happens multiple times within 30min. As far as I can tell, there's no pattern to it.

Workspace rules from hyprland.conf

workspace = 1, monitor:DP-3, default:true, persistent:true
workspace = 2, monitor:DP-3, persistent:true
workspace = 3, monitor:DP-3, persistent:true
workspace = 4, monitor:DP-3, persistent:true
workspace = 5, monitor:HDMI-A-1, default:true

Monitor rules from hyprland.conf

monitor=,preferred,auto,auto
monitor = DP-3, 3840x2160@60, 0x0, 2, bitdepth, 10

System info

OS: Arch Linux x86_64
Kernel: Linux 6.12.25-1-lts
Display (DELL S2722QC): 3840x2160 @ 60 Hz (as 1920x1080) in 27" [External]
WM: Hyprland 0.48.1 (Wayland)
TV: Amazon Fire

This has been happening for months now, so nothing to do with any new updates.

I'm not sure if this is something specific to hyprland, or if the TV is firing random HDMI events that make it think that it's been turned on (it hasn't), but I would love to find out how I can start debugging this.

Update (02/05, 17:00): It definitely has something to do with the TV sending out a signal that then translates to hyprland switching focus to Workspace 5, as I unplugged the TV from the power supply and have not seen any random workspace switching for 4h now.