ImportBot: Detection, link width and BAR1 problems from the cmpunlocker Discord (2026-10-04 to 10-28) and community repos (cmpunlocker, club-170hx, Consensus-Protocol, asm64-hooligan, Proxmox guide); credits inline; sources: @c133, @djpandaman, @darkmaniac7, @globalapathy, @68x0, @_orrorin, @matstatman, @chonsworth, @rrickk420, @analyticeth, @programmerboi, @civiloid (+29 more); GitHub 18gogogo/170hx-hosttovm-passthrough, Consensus-Protocol/cmp170hx, HalfVulpes/CMP170HX-GPU, Johnnydaboy

2026-10-30T08:45:52Z

Detection, link width and BAR1 problems from the cmpunlocker Discord (2026-10-04 to 10-28) and community repos (cmpunlocker, club-170hx, Consensus-Protocol, asm64-hooligan, Proxmox guide); credits inline; sources: @c133, @djpandaman, @darkmaniac7, @globalapathy, @68x0, @_orrorin, @matstatman, @chonsworth, @rrickk420, @analyticeth, @programmerboi, @civiloid (+29 more); GitHub 18gogogo/170hx-hosttovm-passthrough, Consensus-Protocol/cmp170hx, HalfVulpes/CMP170HX-GPU, Johnnydaboy

← Older revision		Revision as of 08:45, 30 October 2026
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	\| {{Source\|handle=lxtend\|date=2026-10-19\|link=https://discord.com/channels/1518634379604136178/1518695328008638516/1561646019870064710\|repo=https://github.com/lixiangwuxian/170hx_tips}}<br />{{Source\|handle=lxtend\|date=2026-10-19\|link=https://discord.com/channels/1518634379604136178/1518695328008638516/1561811130291200154}}		\| {{Source\|handle=lxtend\|date=2026-10-19\|link=https://discord.com/channels/1518634379604136178/1518695328008638516/1561646019870064710\|repo=https://github.com/lixiangwuxian/170hx_tips}}<br />{{Source\|handle=lxtend\|date=2026-10-19\|link=https://discord.com/channels/1518634379604136178/1518695328008638516/1561811130291200154}}
	\|-		\|-
	\| Damaged PCIe edge contacts on arrival		\| Damaged PCIe edge contacts on arrival (a card from Alifond)
	\| Shipping or handling damage		\| Shipping or handling damage
	\| The card still passed stress tests after repeated insertion; long-term effect unknown		\| The card still passed stress tests after repeated insertion; long-term effect unknown
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	<code><nowiki>bar1-resize-unlock.patch</nowiki></code> has caused trouble on some hosts: behind VFIO it led to BAR2/MMU initialisation failures (BAR1 left small), and on an 8-card server with two PEX8796 switches it hung the board and was removed (mailbox P2P runs without it). {{Status\|Reported}}<br />{{Source\|handle=darkmaniac7\|date=2026-10-19\|note=lab notes}}<br />{{Source\|repo=https://github.com/Johnnydaboy/cmpunlocker}}<br />{{Source\|repo=https://github.com/cebeuq/glm53-cmp170hx-recipe}}		<code><nowiki>bar1-resize-unlock.patch</nowiki></code> has caused trouble on some hosts: behind VFIO it led to BAR2/MMU initialisation failures (BAR1 left small), and on an 8-card server with two PEX8796 switches it hung the board and was removed (mailbox P2P runs without it). {{Status\|Reported}}<br />{{Source\|handle=darkmaniac7\|date=2026-10-19\|note=lab notes}}<br />{{Source\|repo=https://github.com/Johnnydaboy/cmpunlocker}}<br />{{Source\|repo=https://github.com/cebeuq/glm53-cmp170hx-recipe}}

	~~A longer write-up by @vipic on compute~~ hangs after the BAR1 resize patch in a ~~passthrough~~ VM ~~exists; see~~ [https://discord.com/channels/1518634379604136178/1518692084729511967/1561427071157272727 Discord].		=== Compute hangs in a passthrough VM after the BAR1 resize patch ===
			In a Debian 13 VM, the unlock showed 64 GB and <code><nowiki>verify.sh</nowiki></code> passed, but any compute job hung, nvidia-smi stopped answering and the VM could not reboot cleanly. Removing the unlock stopped the hangs but put the card back to 8 GB. Building cmpunlocker without <code><nowiki>bar1-resize-unlock.patch</nowiki></code> (drop the <code><nowiki>bar1_resize</nowiki></code> entry from <code><nowiki>common/constants.yaml</nowiki></code> and the patch from <code><nowiki>PATCH_ORDER</nowiki></code> in <code><nowiki>driver/build.sh</nowiki></code>) stopped the hangs and kept all 64 GB. That patch writes the BAR1 XVE registers on 0x20C2 and 0x2082 cards and turns on <code><nowiki>NVreg_EnableResizableBar</nowiki></code>. Full write-up on [https://discord.com/channels/1518634379604136178/1518692084729511967/1561427071157272727 Discord].

			{{Status\|Reported}}<br />
			{{Source\|handle=vipic\|date=2026-10-18\|link=https://discord.com/channels/1518634379604136178/1518692084729511967/1561427071157272727}}

	== VMs and passthrough ==		== VMs and passthrough ==

ImportBot: Detection, link width and BAR1 problems from the cmpunlocker Discord (2026-10-04 to 10-28) and community repos (cmpunlocker, club-170hx, Consensus-Protocol, asm64-hooligan, Proxmox guide); credits inline; sources: @c133, @djpandaman, @darkmaniac7, @globalapathy, @68x0, @_orrorin, @matstatman, @chonsworth, @rrickk420, @analyticeth, @programmerboi, @civiloid (+28 more); GitHub 18gogogo/170hx-hosttovm-passthrough, Consensus-Protocol/cmp170hx, HalfVulpes/CMP170HX-GPU, Johnnydaboy

2026-10-30T08:17:19Z

Detection, link width and BAR1 problems from the cmpunlocker Discord (2026-10-04 to 10-28) and community repos (cmpunlocker, club-170hx, Consensus-Protocol, asm64-hooligan, Proxmox guide); credits inline; sources: @c133, @djpandaman, @darkmaniac7, @globalapathy, @68x0, @_orrorin, @matstatman, @chonsworth, @rrickk420, @analyticeth, @programmerboi, @civiloid (+28 more); GitHub 18gogogo/170hx-hosttovm-passthrough, Consensus-Protocol/cmp170hx, HalfVulpes/CMP170HX-GPU, Johnnydaboy

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Card not detected or BAR allocation fails - Revision history