Hi Thomas, I haven't had much time to investigate the issue -- I'm currently in the process of moving country, which is a lot of work! One thing I was able to determine is that it appears to be related to Intel VT-d/VT-x or whatever Intel's IOMMU/x86 virtualisation tech thing is called. I tried the card in a different older Intel i7 board and it worked flawlessly. I then started to wonder if it was some new incompatibility introduced with Kaby Lake. I had tweaked the UEFI settings on the new Kaby Lake board to enable VT-d/VT-x since I wanted to run Linux as a host OS with Windows 10 running on top of qemu/KVM. Upon resetting the UEFI settings to their defaults (VT-d/VT-x disabled) the card worked without issue. Maybe this will point you in the right direction, especially since you mention that your using EXSi with PCIe passthrough, which requires the use of VT-d/VT-x. Whether the card itself has issues with VT-d/VT-x or it's a driver bug I have yet to determine -- how I do that, no idea! I've CC'd the list, which should include your reply too. See http://vger.kernel.org/vger-lists.html#linux-media to subscribe to the list. Regards, Adam On Sun, Jun 18, 2017 at 6:45 PM, Thomas Kuehne <thomas@xxxxxxxxxx> wrote: > Hi Adam, > > interestingly, I have the same issue and you "fix" also works for me, at least partly. > > I run the quad HD on a little 1RU server that has vmware's ESXi supervisor installed, and the card is configured for PCI passthrough. The virtual machine that makes use of this card runs tvheadend 4.2.2. Other than that, the setup is similar to what you describe. (Ubuntu 16.04.2 LTS Kernel 4.8, driver vb-demod-si2168-b40-01.fw version 4.0.11) > > Without the debug kernel option, I get the same load of errors, and the tvheadend software is not able to tune. > Adding debug level 5, I get a picture. So, I guess I am with you that the additional latency induced by the debug option helped the driver to cope. > > Were you successful in solving the issue with your card? Any idea how we might get this looked at? I haven't worked out how I can respond to your thread on the mailing list (found it via a google search at the mail archive). Maybe you can add my response to the thread? > > Best regards, > > Thomas
