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Video stream and KB+mouse works only in OS session #227

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opened 2026-02-20 13:22:44 -05:00 by deekerman · 7 comments
deekerman commented 2026-02-20 13:22:44 -05:00
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Originally created by @al-pankov on GitHub (Apr 30, 2021).

Originally assigned to: @mdevaev on GitHub.

Describe the bug
Video stream and KB+mouse works only in OS session. No stream and KB+mouse during BIOS post and so on until OS booted.

To Reproduce
Steps to reproduce the behavior, like:

  1. Go to 'KVM-mode' or connect using VNC
  2. Reboot the PC
  3. See error

Expected behavior
Previous version KVMd 2.8 and Ustreamer 2.2 works as expected on the same hardware.

Screenshots
No screenshots.

Desktop (please complete the following information):

  • OS: Windows 10
  • Browser: Chrome
  • Version: 90
  • VNC client: TigerVNC 1.11.0

Pi-KVM info:

  • Raspberry Pi board version: RPi 4
  • Pi-KVM platform: v2-hdmi
  • Video capture type: CSI bridge
  • KVMD version: 2.59-1
  • uStreamer version: 3.27-1
  • Linux kernel: Linux pikvm 5.10.23-2-ARCH #1 SMP Thu Mar 18 18:33:35 MSK 2021 armv7l GNU/Linux

Additional context
I've tested this error with desktop PC with discrete video card Nvidia GT730 and Lenovo laptop with integrated video card Intel UHD.

Originally created by @al-pankov on GitHub (Apr 30, 2021). Originally assigned to: @mdevaev on GitHub. **Describe the bug** Video stream and KB+mouse works only in OS session. No stream and KB+mouse during BIOS post and so on until OS booted. **To Reproduce** Steps to reproduce the behavior, like: 1. Go to 'KVM-mode' or connect using VNC 2. Reboot the PC 3. See error **Expected behavior** Previous version KVMd 2.8 and Ustreamer 2.2 works as expected on the same hardware. **Screenshots** No screenshots. **Desktop (please complete the following information):** - OS: Windows 10 - Browser: Chrome - Version: 90 - VNC client: TigerVNC 1.11.0 **Pi-KVM info:** - Raspberry Pi board version: RPi 4 - Pi-KVM platform: v2-hdmi - Video capture type: CSI bridge - KVMD version: 2.59-1 - uStreamer version: 3.27-1 - Linux kernel: Linux pikvm 5.10.23-2-ARCH #1 SMP Thu Mar 18 18:33:35 MSK 2021 armv7l GNU/Linux **Additional context** I've tested this error with desktop PC with discrete video card Nvidia GT730 and Lenovo laptop with integrated video card Intel UHD.
deekerman commented 2026-02-20 13:22:46 -05:00
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@mdevaev commented on GitHub (Apr 30, 2021):

Hello. See this: https://github.com/pikvm/pikvm/blob/master/pages/edid.md

@mdevaev commented on GitHub (Apr 30, 2021): Hello. See this: https://github.com/pikvm/pikvm/blob/master/pages/edid.md
deekerman commented 2026-02-20 13:22:46 -05:00
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@mdevaev commented on GitHub (Apr 30, 2021):

In the new versions, this logic has not changed, perhaps this is really an EDID problem.

@mdevaev commented on GitHub (Apr 30, 2021): In the new versions, this logic has not changed, perhaps this is really an EDID problem.
deekerman commented 2026-02-20 13:22:46 -05:00
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@al-pankov commented on GitHub (May 7, 2021):

It was my fault.
The desktop PC has 2 video outputs and I connected the PiKVM to an output that did not transmit a video stream when the system was booted.
Lenovo laptop did not have video streaming enabled to HDMI port at system boot.

@al-pankov commented on GitHub (May 7, 2021): It was my fault. The desktop PC has 2 video outputs and I connected the PiKVM to an output that did not transmit a video stream when the system was booted. Lenovo laptop did not have video streaming enabled to HDMI port at system boot.
deekerman commented 2026-02-20 13:22:47 -05:00
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@wcck commented on GitHub (Dec 13, 2021):

Hi @al-pankov, @mdevaev

How to enable HDMI on my Lenovo laptop when reboot ?
This NB is my remote system.
I want to connect it to operate BIOS's feature.
However BIOS didn't show any screen on reboot.

Describe the bug
No signal on reboot but Web UI will show screen until enter OS.

Pi-KVM info:

  • Raspberry Pi board version: RPi 4
  • Pi-KVM platform: v2-hdmi
  • Video capture type: CSI bridge
  • KVMD version: 3.48-1
  • uStreamer version: 4.9-1
  • Linux kernel: Linux pikvm 5.10.52-13-ARCH #1 SMP Sat Nov 20 09:40:57 MSK 2021 armv7l GNU/Linux

Lenovo info. :

  • Model : ThinkPad 2 E14
  • CPU : AMD Ryzen 5 4500U
  • Graphics : AMD Radeon(TM) Graphics

Host

  • OS: Windows 10
  • Browser: Chrome
  • Browser's Version: 96.0.4664.45

Thanks

@wcck commented on GitHub (Dec 13, 2021): Hi @al-pankov, @mdevaev How to enable HDMI on my Lenovo laptop when reboot ? This NB is my remote system. I want to connect it to operate BIOS's feature. However BIOS didn't show any screen on reboot. **Describe the bug** No signal on reboot but Web UI will show screen until enter OS. **Pi-KVM info:** - Raspberry Pi board version: RPi 4 - Pi-KVM platform: v2-hdmi - Video capture type: CSI bridge - KVMD version: 3.48-1 - uStreamer version: 4.9-1 - Linux kernel: Linux pikvm 5.10.52-13-ARCH #1 SMP Sat Nov 20 09:40:57 MSK 2021 armv7l GNU/Linux **Lenovo info. :** - Model : ThinkPad 2 E14 - CPU : AMD Ryzen 5 4500U - Graphics : AMD Radeon(TM) Graphics **Host** - OS: Windows 10 - Browser: Chrome - Browser's Version: 96.0.4664.45 Thanks
deekerman commented 2026-02-20 13:22:47 -05:00
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@wcck commented on GitHub (Dec 13, 2021):

[Update]
I tried https://docs.pikvm.org/webrtc/#custom-janus-config and #78 .
However still didn't show any screen on UEFI.

@wcck commented on GitHub (Dec 13, 2021): [Update] I tried https://docs.pikvm.org/webrtc/#custom-janus-config and #78 . However still didn't show any screen on UEFI.
deekerman commented 2026-02-20 13:22:47 -05:00
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@al-pankov commented on GitHub (Dec 14, 2021):

Laptop BIOS - Config - Display - Boot Display Device: HDMI

@al-pankov commented on GitHub (Dec 14, 2021): Laptop BIOS - Config - Display - Boot Display Device: HDMI
deekerman commented 2026-02-20 13:22:47 -05:00
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@wcck commented on GitHub (Dec 14, 2021):

Hi @al-pankov
I tried success.
Thank you very much!

@wcck commented on GitHub (Dec 14, 2021): Hi @al-pankov I tried success. Thank you very much!
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