VT-d breaks suspend/resume (Lenovo T460)

[Myron Weber]

I had v3.2 installed and running great with VT-d disabled. When I enabled it in the BIOS, everything else seems OK but when the laptop suspends, it will no longer wake up. I have to hold down the power button for a hard power off to restart.

This is a recent, new install of Qubes OS v. 3.2 on a Lenovo T460.

Disable/enable of VT-d a couple times and testing the suspend/resume confirms that VT-d is the culprit in this behavior.

Can anyone provide insight on how to fix or at least begin to diagnose?

Thanks.

[Ed]

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I had the same problem with a lenovo x1 carbon, there are a lot of threads out there with this issue, with a lot of fixes (such as update the bios), but for me I fixed it by disabling the security module (TPM) in bios.

Ed

[Myron Weber]

On Saturday, May 13, 2017 at 12:18:19 PM UTC-7, Ed wrote:

> I had the same problem with a lenovo x1 carbon, there are a lot of threads out there with this issue, with a lot of fixes (such as update the bios), but for me I fixed it by disabling the security module (TPM) in bios.
>
> Ed

Thanks - that did it for me, too. I guess I can pick any 2 out of 3: (1) suspend/resume, (2) VT-d, and (3) TPM. I'm not using AEM, so TPM loses.