AM1H-ITX P1.50 - can't boot without a monitor?
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: http://forum.asrock.com/forum_posts.asp?TID=204
Printed Date: 22 Mar 2023 at 11:21pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: AM1H-ITX P1.50 - can't boot without a monitor?
Posted By: myxal
Subject: AM1H-ITX P1.50 - can't boot without a monitor?
Date Posted: 01 Jun 2015 at 5:26am
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I want to the motherboard for a small headless server. I got the system installed in UEFI mode, CSM is disabled in Setup, fastboot/secureboot/ultrafast boot are also all disabled. With a monitor attached, everything works fine. Since the server will run headless, I checked if the system boots without a monitor - and it doesn't! The system powers up, but nothing happens. Attaching a monitor back again, a strange error appears: http://imgur.com/FljKXyI" rel="nofollow">  Obviously, I don't have a dedicated GPU installed, so why does this appear?
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Replies:
Posted By: Xaltar
Date Posted: 01 Jun 2015 at 1:56pm
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You have CSM disabled and it says does not support "CSM Disable". Try enabling CSM and see if you get anywhere. If that fails then you can just turn the server on, wait for 10 seconds and hit F1 and it will continue to boot. Do you have your server set to auto wake or something? If not just hitting F1 at boot shouldn't be a problem.
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Posted By: myxal
Date Posted: 01 Jun 2015 at 4:07pm
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Yes, enabling CSM allows the system to boot without peripherals. I'm just baffled by the error message - it's obviously wrong (there's no discrete VGA card in the system), and why does enabling CSM fix the issue anyway? My guess is that the UEFI firmware programmers made an assumption that if the onboard video outputs are all disconnected, then the user is using a discrete card, and the board searches for the GOP outside of its own firmware. It obviously can't find any, since there's no other graphics card! I hope Asrock fixes the problem in a future release. Just because there's an easy workaround doesn't mean that bugs in firmware are acceptable.
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Posted By: Xaltar
Date Posted: 01 Jun 2015 at 5:19pm
Ah, you didn't mention that you were not using a discrete GPU. I suspect you may be right as the way the system determines where to send the GPU output is by determining where the monitor is connected. Nice find, I am sure monitorless operation was not considered when designing the firmware 
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Posted By: Shadow
Date Posted: 06 Jun 2015 at 6:05am
| I would suggest going into the UEFI and selecting onboard only as the output source. Since it looks to be set to auto, it's going to assume you have a discrete card is nothing is detected on the on-board connection. Once that is set, you should be able to go back to full UEFI boot |