This is now fixed (posting here for documentation.)
Essentially the system is booting too fast for the card to be seen by ProxMox.
I changed 2 parts. Firstly i slowed down the post screen from 5 seconds to 10 seconds and also changed a setting in the bios to stop the power management to the pci bus.
Just to add to this - hopefully Dell will issue some sort of firmware/bios update....ive got rebar enabled in the bios but the B50 thinks its not switched on/enabled....
Ive had some help on the ProxMox forum so once proxmox has booted the pci bus needs to be refreshed/rescanned - then the card appears. This is the command used...
echo "1" > /sys/bus/pci/rescan
He has suggested delaying the boot in the bios...does anyone know where that setting would be?
@Comfy Glad that you managed to find the workaround and even more glad that you documented it here. I've took the liberty of marking your post as accepted solution
Doesn't the Intel Pro B60 have two GPUs on a single card? I think it would need to be setup for bifurcation to 8x8x in the bios for X16 pcie slot, and enable above 4Gb, since it has two 8x pcie seperated on a single x16 pcie on the GPU, it's just a thought.
Not that im aware of. Ive fixed the problem now....its a combination of the S3/S5 control and the power management setting to the PCi bus....never had to do that with the A2000 i had before though. As for talking to Dell support....a. i highly doubt they would even reply to me and b. in a perfect world they would be proactive and get the same setup together (its not hard) and then test it for themselves. And c. not really connected but theyve had a latitude from my workplace for 5 weeks now and not managed to repair it...not only that their AI support tool keeps asking me the same questions at 3am....most mornings...
Comfy
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February 12th, 2026 11:45
This is now fixed (posting here for documentation.)
Essentially the system is booting too fast for the card to be seen by ProxMox.
I changed 2 parts. Firstly i slowed down the post screen from 5 seconds to 10 seconds and also changed a setting in the bios to stop the power management to the pci bus.
This is now working.
Comfy
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February 10th, 2026 21:21
Just to add to this - hopefully Dell will issue some sort of firmware/bios update....ive got rebar enabled in the bios but the B50 thinks its not switched on/enabled....
Comfy
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February 11th, 2026 15:04
Ive had some help on the ProxMox forum so once proxmox has booted the pci bus needs to be refreshed/rescanned - then the card appears. This is the command used...
echo "1" > /sys/bus/pci/rescan
He has suggested delaying the boot in the bios...does anyone know where that setting would be?
mazzinia_
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1.5K Posts
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February 12th, 2026 14:22
@Comfy Glad that you managed to find the workaround and even more glad that you documented it here. I've took the liberty of marking your post as accepted solution
Comfy
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February 12th, 2026 14:42
Just to add though the rebar function isnt fixed in windows so i guess that would be some sort of dell bios update?
mazzinia_
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February 12th, 2026 17:19
@Comfy Probably. It's something that should be discussed with the technical support
Cyberato
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February 24th, 2026 01:38
Hi There,
Doesn't the Intel Pro B60 have two GPUs on a single card? I think it would need to be setup for bifurcation to 8x8x in the bios for X16 pcie slot, and enable above 4Gb, since it has two 8x pcie seperated on a single x16 pcie on the GPU, it's just a thought.
Hope you find a solution. Later:)
Comfy
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February 24th, 2026 08:26
Not that im aware of. Ive fixed the problem now....its a combination of the S3/S5 control and the power management setting to the PCi bus....never had to do that with the A2000 i had before though. As for talking to Dell support....a. i highly doubt they would even reply to me and b. in a perfect world they would be proactive and get the same setup together (its not hard) and then test it for themselves. And c. not really connected but theyve had a latitude from my workplace for 5 weeks now and not managed to repair it...not only that their AI support tool keeps asking me the same questions at 3am....most mornings...