I’m trying to reset some PCI devices to try to solve this problem.

I’ve read that there are many ways to perform this operation.

1. Turn on bit 15 on the PCI Express Capability control offset (function level reset).
2. Turn on bit 6 on the PCI control offset of a PCI bridge device (hot reset).

I tried both of them in EFI shell, but I’m not really sure they worked because I didn’t notice any “mini freeze time” and the registers didn’t show any change.

In addition, looking at the PCI-E base specification, it says that bit 5 on the PCI control offset of a PCI bridge device must be hardwired to 0; and that’s the only bit from the control register which my PC shows as 1 (0x10 = 5º bit, 1º photo).