this post was submitted on 16 Jan 2025
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Hard time with an HDMI switch (slrpnk.net)
submitted 2 days ago* (last edited 2 days ago) by SolarPunker@slrpnk.net to c/linux@lemmy.ml
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I use this HDMI switch between PC and PlayStation4, it seems that PS4 has no problems at all but PC often struggles to get signal back and no longer appears on screen after the switch. Looks like PC can perfectly switch without issue in the BIOS or when I boot in "nomodeset", so it should be something Linux related. I've also tried with my intel iGPU bypassing my RX580 and the issue persist.

My setup:

EndeavourOS (Arch Linux), KDE Plasma, systemd-boot, SDDM, amdgpu, a cheap nobrand HDMI switch with a simple but respectful job to do

Additional notes:

  1. If I manually unplug the monitor's hdmi switch and plug it back in it works, maybe something related to power options?
  2. Maybe I have to load graphics modules earlier at kernel startup? I don't know if they are already like this by default on recent kernels but it's a consideration.
  3. Another hypothesis is that it's BIOS related, I've already tried to set the PCIe GPU as primary. I have disabled secure-boot and fast-boot to use the distro.
  4. Thanks for any advice, in these days I will also try other consoles and devices, I will update this post.
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[–] Dirk@lemmy.ml 4 points 2 days ago (2 children)

Check the manual of the switch if it simulates a connected monitor for the client.

Some clients are picky when it comes to unplugging monitors or booting without one.

Wayland also seems to do something weird when the monitor is off (I have some applications where the window becomes tiny when turning off the screen).

[–] data1701d@startrek.website 1 points 1 hour ago

If it doesn’t simulate a connected monitor, it looks like there are little HDMI shims that do called EDID emulators that are available for relatively cheap.

[–] corsicanguppy@lemmy.ca 1 points 1 day ago (1 children)

simulates a connected monitor for the client.

EDID, right?

[–] Dirk@lemmy.ml 1 points 1 day ago

Exactly. Your KVM switch need to support it, or your clients will always act like you unplugged the screen when you switch between them.