Asus P6t VT-D support

[Enforcer]

I have a asus p6t motherboard (link to bios: https://dlcdnets.asus.com/pub/ASUS/mb/LG...S-1408.zip)
When I enable VT-D, windows refuses to boot and qubes warns that it wont install properly if I try. Apparently this is an issue with the DMAR table. My CPU is core i7-920. The wikipedia page for VT-D compatibility says that this CPU should support it. However that isnt the case so far. Can someone mod this BIOS to support VT-D in actuality instead of just in the manual?

[naryfa]

I would like to piggy back on this request. Have a P6T SE and VT-d is gone with BIOS 0908 

Also, the optical audio seems to be gone as well... but that's just a side issue.

[Enforcer]

The oldest BIOS revision that I managed to test was 1004 (the motherboard wouldn't let me install a BIOS older than itself) and I also tested everything in between. None of them brought a positive result. If that's of any help.

[naryfa]

It's weird, because the version you list is 1408 and it appears to be for P6T. My board is P6T SE (to be exact) and the BIOS on ASUS's website for that particular board is at 0908.

[Enforcer]

Those 2 motherboards have very similar (often exactly the same) BIOS release dates, but they are named very differently. I think that it is safe to say that the two BIOSes were built on the same base with minimal differences between each other.

[blero]

Hello,

If you want to be able to boot in Windows 10 with Vt-d enabled, try this in BIOS:

- Vt-d: [Enabled]
- Advanced menu / USB 2.0 Controller: [Disabled]

Yes... this works for me and my P6T Deluxe (and USB ports still work as USB 2.0 speed !).

[chcoust]

Hello

I just and only created an account here to confirm that I have been able to enable VT-d on my old Asus P6TD Deluxe v2 with Windows 10 2004+ (20H2) thanks to your tips to disable USB 2.0 in the Bios !
I haven't seen anywhere else on the interwebs this very unlikely but working way to enable VT-d for my X58 chipset.
I still had some work with Hyper-V after that to be able to boot latest VMWare Workstation but still, I made it there.

Thanks a lot !

[d_yar]

Hello,

If you want to be able to boot in Windows 10 with Vt-d enabled, try this in BIOS:

- Vt-d: [Enabled]
- Advanced menu / USB 2.0 Controller: [Disabled]

Yes... this works for me and my P6T Deluxe (and USB ports still work as USB 2.0 speed !).

Hello, thanks, its working for me two

[Enforcer]

This is not a functioning solution. While Windows 10 v2004 will in fact boot without error, Qubes OS will still report VT-D as non functioning. When I looked into it further, there was a lot of conflicting evidence but the use of dmesg command revealed a dmar error:"DMAR-IR: This system BIOS has enabled interrupt remapping on a chipset that contains an erratum making that feature unstable. To maintain system stability interrupt remapping is being disabled. Please contact your BIOS vendor for an update"

[blero]

My CPU is core i7-920. The wikipedia page for VT-D compatibility says that this CPU should support it.

Hello,

If you're referring to this page, I don't think it's reliable:
https://en.wikipedia.org/wiki/List_of_IO...re#Desktop

On Intel website, I couldn't find the info that this CPU supports Vt-d.
https://ark.intel.com/content/www/fr/fr/...l-qpi.html
https://ark.intel.com/content/www/us/en/...ctType=873&0_VTD=True&3_CoreCount-Min=4&3_CoreCount-Max=4&3_ThreadCount-Min=8&3_ThreadCount-Max=8

And here:
https://wiki.xen.org/wiki/VTd_HowTo
"ASUS P6T documentation claims support, but does not work due to DMAR-table issue".
So you seem to be right on this.

Edit: Ok, I found this thread:
https://community.intel.com/t5/Processor...d-p/238192
So maybe the Intel website is the one that is not reliable...