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Video refresh issues in HP UEFI when using PiKVM #1098

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opened 2026-02-20 14:11:03 -05:00 by deekerman · 5 comments

deekerman commented

2026-02-20 14:11:03 -05:00

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Originally created by @Rothenbacher on GitHub (Jan 9, 2026).

Describe the bug
I am currently experiencing an issue with the video transmission when accessing the HP UEFI/BIOS through PiKVM.

When the system is in the UEFI environment, the video output is not refreshed correctly. The displayed image appears to be frozen or partially frozen. Screen updates only occur when I move the mouse cursor over the affected area of the image. As soon as the mouse passes over a specific section of the screen, that part is redrawn, while the rest of the image remains unchanged.

This behavior only occurs within the HP UEFI interface. Once the operating system has booted, the video transmission via PiKVM works as expected without any noticeable issues.

The problem makes it difficult to navigate or configure UEFI settings, as changes on the screen are not visible unless the mouse is moved across the corresponding screen areas.

Screenshots

Desktop (please complete the following information):

OS: Windows
Browser: Edge
Version: 138.0.3351.95

PiKVM info:

Raspberry Pi board version: RPi 4 Model B
PiKVM platform: DIY PiKVM V2
Video capture type: CSI bridge
KVMD version: 4.121-1
uStreamer version: 6.41-1
Linux kernel: Linux pikvm 6.12.56-1-rpi

Originally created by @Rothenbacher on GitHub (Jan 9, 2026). **Describe the bug** I am currently experiencing an issue with the video transmission when accessing the HP UEFI/BIOS through PiKVM. When the system is in the UEFI environment, the video output is not refreshed correctly. The displayed image appears to be frozen or partially frozen. Screen updates only occur when I move the mouse cursor over the affected area of the image. As soon as the mouse passes over a specific section of the screen, that part is redrawn, while the rest of the image remains unchanged. This behavior only occurs within the HP UEFI interface. Once the operating system has booted, the video transmission via PiKVM works as expected without any noticeable issues. The problem makes it difficult to navigate or configure UEFI settings, as changes on the screen are not visible unless the mouse is moved across the corresponding screen areas. **Screenshots** <img width="2552" height="1176" alt="Image" src="https://github.com/user-attachments/assets/8bb4f2db-2f11-44e4-9551-67c5f91f894e" /> **Desktop (please complete the following information):** - OS: Windows - Browser: Edge - Version: 138.0.3351.95 **PiKVM info:** - Raspberry Pi board version: RPi 4 Model B - PiKVM platform: DIY PiKVM V2 - Video capture type: CSI bridge - KVMD version: 4.121-1 - uStreamer version: 6.41-1 - Linux kernel: Linux pikvm 6.12.56-1-rpi

deekerman commented

2026-02-20 14:11:04 -05:00

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@mdevaev commented on GitHub (Jan 9, 2026):

Hello. You can try to play with EDID to fix this https://docs.pikvm.org/edid

@mdevaev commented on GitHub (Jan 9, 2026): Hello. You can try to play with EDID to fix this https://docs.pikvm.org/edid

deekerman commented

2026-02-20 14:11:04 -05:00

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@Rothenbacher commented on GitHub (Jan 9, 2026):

Hello,

thanks for the quick response.
I have now tested the various Example EDIDs for V1-V3, but none of them solved the problem.

@Rothenbacher commented on GitHub (Jan 9, 2026): Hello, thanks for the quick response. I have now tested the various Example EDIDs for V1-V3, but none of them solved the problem.

deekerman commented

2026-02-20 14:11:04 -05:00

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@mdevaev commented on GitHub (Jan 9, 2026):

Did you perform the host reboot after changing edid?

@mdevaev commented on GitHub (Jan 9, 2026): Did you perform the host reboot after changing edid?

deekerman commented

2026-02-20 14:11:04 -05:00

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@Rothenbacher commented on GitHub (Jan 12, 2026):

Yes i restarted the host after changing the edid.

@Rothenbacher commented on GitHub (Jan 12, 2026): Yes i restarted the host after changing the edid.

deekerman commented

2026-02-20 14:11:04 -05:00

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@ewspikvm commented on GitHub (Jan 12, 2026):

@Rothenbacher it appears you are using a DIY system. The challenge there is that the CSI bridge only supports up to 1080p 50Hz, and many BIOS/UEFI implementations only support 60Hz, which might be the cause of the artifacting that you are seeing.

Can you check the journalctl -u kvmd output from when you boot the system up through when you go into the UEFI screen and see what the PiKVM is negotiating for in terms of resolution and refresh rate?

@ewspikvm commented on GitHub (Jan 12, 2026): @Rothenbacher it appears you are using a DIY system. The challenge there is that the CSI bridge only supports up to 1080p 50Hz, and many BIOS/UEFI implementations only support 60Hz, which might be the cause of the artifacting that you are seeing. Can you check the `journalctl -u kvmd` output from when you boot the system up through when you go into the UEFI screen and see what the PiKVM is negotiating for in terms of resolution and refresh rate?