Ulrich Windl:
> Hi!
> 
> I had reported problems with the RTL8111/8168/8411 ethernet controller
> and Qubes OS before. In the meantime I found out that it does not work
> when Windows 10 was running, and after a "restart" Qubes SO is booted.
> 
> The effect is interesting: The card detects whether the link goes up or
> down, detects the proper speed, tries DHCP, but never gets an address.
> 
> Only when I power don the PC and reboot Qubes OS, I get an address from
> DHCP.  I suspect that the card isn't fully reset when Qubes OS boots.
> 
> 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 11)

Does that card support strict reset, and if so, does enabling it help? I
think the order of operations with strict reset enabled goes like:

1. Power on PC
2. Card partially initializes with pciback xen driver
3. Power on VM with pass-through NIC
4. Strict reset sent to NIC
5. Card fully initializes with VM's drivers
6. Power off VM
7. Card gets reattached to pciback

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