> So, my conclusion is that there is something specific to the debian kernels
> that is breaking this USB ethernet card.
The IOMMU error is most likely caused by a bug in the VL805 firmware.
It happens with the Debian kernel (and not mainline) as Debian patches
the kernel to enable IOMMU by
Both of those fixes are included in 3.16.7-ckt7-1, the version you
reported this against. Are you still seeing a similar problem?
So they are. Hmm. I was getting a hang every day or so with
3.16.7-ckt7-1. With latest linux git I am getting zero hangs. There
was also a report in the Launchpad
Package: src:linux
Version: 3.16.7-ckt7-1
Severity: normal
Dear Maintainer,
As documented at
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1384342 a
GPU hang will regularly occur on Intel IvyBridge and Haswell GPUs.
This was fixed upstream in patches 48bf5b2 and 2a92d5b which were
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