Unable to see UEFI BIOS on ASRock Z790M-ITX #784

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opened 2026-02-20 14:06:15 -05:00 by deekerman · 3 comments

deekerman commented

2026-02-20 14:06:15 -05:00

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Originally created by @CloudMass on GitHub (Dec 11, 2023).

Originally assigned to: @mdevaev on GitHub.

Describe the bug
I have build a NAS using the ASRock Z790M-ITX motherboard but I can't see the BIOS when using the PiKVM

To Reproduce
Reboot the NAS connected to the PiKVM and no video signal will be shown until the OS is booted.

Expected behavior
Expect to see a BIOS boot image with option to enter the BIOS and make changes

Screenshots
N/A

Desktop

OS: Ubuntu 22.04.3 LTS
Browser: Brave 1.59.117

PiKVM info:

Raspberry Pi board version: Raspberry Pi 4 Model B Rev 1.1
PiKVM platform: Ready-made PiKVM V3
KVMD version: kvmd 3.276-1, kvmd-fan 0.26-1, kvmd-oled 0.26-1, kvmd-platform-v3-hdmi-rpi4 3.276-1, kvmd-webterm 0.44-1
uStreamer version: ustreamer 5.45-1
Linux kernel: Linux pikvm 6.1.61-1-rpi-ARCH #1 SMP Fri Nov 3 20:48:52 MSK 2023 armv7l GNU/Linux

Additional context
I have tried several different EDID settings both with HDMI -> HDMI & DP -> HDMI.
The default suggested as well as some custom 1024x768, 1280x720 & 1920x1080)

Originally created by @CloudMass on GitHub (Dec 11, 2023). Originally assigned to: @mdevaev on GitHub. **Describe the bug** I have build a NAS using the ASRock Z790M-ITX motherboard but I can't see the BIOS when using the PiKVM **To Reproduce** Reboot the NAS connected to the PiKVM and no video signal will be shown until the OS is booted. **Expected behavior** Expect to see a BIOS boot image with option to enter the BIOS and make changes **Screenshots** N/A **Desktop** - OS: Ubuntu 22.04.3 LTS - Browser: Brave 1.59.117 **PiKVM info:** - Raspberry Pi board version: Raspberry Pi 4 Model B Rev 1.1 - PiKVM platform: Ready-made PiKVM V3 - KVMD version: kvmd 3.276-1, kvmd-fan 0.26-1, kvmd-oled 0.26-1, kvmd-platform-v3-hdmi-rpi4 3.276-1, kvmd-webterm 0.44-1 - uStreamer version: ustreamer 5.45-1 - Linux kernel: Linux pikvm 6.1.61-1-rpi-ARCH #1 SMP Fri Nov 3 20:48:52 MSK 2023 armv7l GNU/Linux **Additional context** I have tried several different EDID settings both with HDMI -> HDMI & DP -> HDMI. The [default suggested](https://docs.pikvm.org/edid/#default-edid) as well as some custom 1024x768, 1280x720 & 1920x1080)

deekerman

2026-02-20 14:06:15 -05:00

closed this issue
added the
resolution:fixed

type:question
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deekerman commented

2026-02-20 14:06:17 -05:00

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@arch1mede commented on GitHub (Dec 11, 2023):

Hi, we would recommend that you join Discord for further troubleshooting, you may need to try all of the EDID's as we don't have any specific info on which EDID is going to work with your MB BIOS.

IF no EDID works, these its possible that you will need to also get some down scaler to get BIOS to show up, we would recommend the JTECH.

@arch1mede commented on GitHub (Dec 11, 2023): Hi, we would recommend that you join [Discord](https://discord.gg/bpmXfz5) for further troubleshooting, you may need to try all of the EDID's as we don't have any specific info on which EDID is going to work with your MB BIOS. IF no EDID works, these its possible that you will need to also get some down scaler to get BIOS to show up, we would recommend the [JTECH](https://www.amazon.com/Splitter-Multi-Resolution-J-Tech-Digital-downscale/dp/B0839PRQ2V?th=1).

deekerman commented

2026-02-20 14:06:17 -05:00

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@mdevaev commented on GitHub (Dec 14, 2023):

I'm closing this because we're dealing with these kinds of issues in discord. If you haven't written there yet, please do so, and our support will help you.

@mdevaev commented on GitHub (Dec 14, 2023): I'm closing this because we're dealing with these kinds of issues in discord. If you haven't written there yet, please do so, and our support will help you.

deekerman commented

2026-02-20 14:06:17 -05:00

Author

Owner

@CloudMass commented on GitHub (Dec 27, 2023):

To anyone having this issue I ended up solving it by using a HDMI EDID Emulator.

@CloudMass commented on GitHub (Dec 27, 2023): To anyone having this issue I ended up solving it by using a HDMI EDID Emulator.