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Micred,
The basic issue is that without something being plugged into a video port, the on board GPU gets shut down. Since the GPU is not displaying anything, all you get is a blank screen. You can use a display port or HDMI display emulator to resolve the issue you are seeing.
Joe
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Which tool are you using to open the KVM session?
Which version of AMT is on your system?
What are the exact steps you are trying to do? (when you remove the monitor? And when its attached?)
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- No monitor cable connected
- Start system
- Connect to AMT KVM console using our software: you can see BIOS boot process, grub boot loader boot progress. The grub boot loader messages telling it is loading kernel & ramdisk are the last you see. After that the screen goes either blank totally, or only the bootloader messages stay, like shown in the screencast.
- If you close the AMT KVM console, and connect again to the console, you get a total blank screen.
- Near the end of the screencast at 1:20 I get tired of waiting and do connect the monitor. As you can see visual appears instantly (along with a drm kernel warning message, you always get when you connect or disconnect a display)
- No monitor cable connected
- Start system
- Connect to AMT KVM console using our software, add the i915.modeset=0 kernel boot parameter in grub.
- As you can see with that parameter added display does works properly, and get the login prompt within seconds.
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What happens when you boot passing the "nomodeset" option to the Kernel? (you need to pass this option to kernel in the boot loader)
Gael
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What happens when you boot passing the "nomodeset" option to the Kernel? (you need to pass this option to kernel in the boot loader)
With "nomodeset" it works fine as well (looks the same as with i915.modeset=0)
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1) Are you seeing the following error?: "Error: 0x80862000: Unsupported or inactive display adapter" message after some time (about a minute).
2) Also - could you provide the register dump using intel_reg_dumper (http://intellinuxgraphics.org/intel_reg_dumper.html) ?
This would help us understand whether we are seeing the same problem on our platform.
Thanks!
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I know this is an old post, but is this fixed? Is the only option to change the Kernel boot parameter?
I'm having the same issues as reported here, with slightly different config and setup:
I have Fuel OpenStack running with nodes. When I connect to AMT Remote Desktop, I get a black screen, as soon as I connect a physical monitor, I can see the screen (both on the physical screen as well as on the vnc viewer). As soon as I disconnect the physical cable I lose the vnc viewer screen as well.
The catches are: I can't install the tools to run update-grub on the node, so changing the kernel boot is not an option for ubuntu. The fuel server is running centos and the nodes are running ubuntu, I get the same results from either.
The viewer I'm using is the latest version of Real VNC Viewer.
Any help would be appriciated.
Thanks,
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Hey John
The basic issue is that the system isn't detecting a connected monitor, so to save power the GPU is being powered down. My recommendation is to use a display emulator to trick the system into thinking there is a attached monitor
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We just bought a couple of Dell Precision Tower 3620 and we cannot make AMT KVM (VNC) headless.
Without a monitor attached we didn't see anything (no bootup process, no bios, no operative system). All works good with a monitor attached.
BIOS is updated (1.3.4) and Intel AMT 11.0.0.
Connecting to http://host:16992/events.htm we got this event:
System board No video device detected.
Our configuration is:
User consent required: NONE
Default Visible monitor: Primary default (also Secondary tested)
The curious fact is that VNC is working and keyboard send keystrokes to the host, but the screen is just black.
I will write to Dell and I hope there is a workaround, but the conclusion is that not all AMT workstations can run headless out of the box.
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Micred,
The basic issue is that without something being plugged into a video port, the on board GPU gets shut down. Since the GPU is not displaying anything, all you get is a blank screen. You can use a display port or HDMI display emulator to resolve the issue you are seeing.
Joe
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Hi,
We bought some Intel vPro motherboard (ASROCK Q170M vPro) and we are facing the same issue.
No remote display if no physical display plugged into the motherboard.
Joe,
Is there a way to 'not need' a display port emulator and have the onboard GPU always active even if not display attached ?
When no display and no emulator, is it still possible to power on / power off the machine remotely ? or all is stuck because no external display beeing connected ?
Regards,
Christophe.
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Hey Christophe,
Turning off the GPU when no monitor is attached is a power saving behavior controlled by the OEM BIOS. As I am not familiar with the ASRock boards, I would look in the BIOS for a setting. However I doubt it will be there.
As to other features of vPro, they are all available, so long as you are not doing KVM in conjuction with another operation.
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<< Turning off the GPU when no monitor is attached is a power saving behavior controlled by the OEM BIOS. >>
Note that KVM functionality does work in the BIOS, just not in Linux.
Issue is in the i915 Linux driver, and Intel seems unwilling to fix it.
To quote your co-worker Daniel Vetter (Intel OTC), in the formal bug report:
https://bugs.freedesktop.org/show_bug.cgi?id=45336#c9
==
I'll wontfix this - it's kinda a feature request and we can work around it by forcing the connector state already. Doing proper kvm output detection needs a bit of code, but judging by the amount of noise in this bugzilla the demand isn't high.
==
Note that not many people complaining about this, does not mean there is no demand. It is more likely many of your customers just did not find the right place to complain...

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