pci_alloc_irq_vectors fails ENOSPC for XPS 13 9310

[Kalle Valo]

Thomas Krause <thomaskrause at posteo.de> writes:

> Am 10.11.20 um 09:33 schrieb Kalle Valo:
>>
>>> I was told that on Dell XPS 15 (with a working QCA6390 setup) there's a
>>> separate "Virtualisation" setting in BIOS. See if you have that and try
>>> enabling it.
>> I was informed about another setting to test: try disabling "Enable
>> Secure Boot" in the BIOS. I don't know yet why it would help, but that's
>> what few people have recommended.
>>
>> Please let me know how it goes.
>>
> I have two options under "Virtualization" in the BIOS: "Enable Intel
> Virtualization Technology (VT)" and "VT for Direct I/O". Both were
> enabled. Secure boot was also turned off. BIOS version is also at the
> most current version 1.1.1.

This is good to know, thanks for testing. Now we have explored all
possible BIOS options as I know of.

> Because of the dmesg errors Thomas Gleixner mentioned, I assume it
> would be best to contact Dell directly (even if I'm not sure if and
> how fast they will respond).

I have asked our people to report this to Dell, but no response yet.

> If the driver would manage to work with only 1 vector, I assume this
> would also make it work on my configuration, even with possible
> performance hits.

This is the workaround we are working on at the moment. There's now a
proof of concept patch but I'm not certain if it will work. I'll post it
as soon as I can and will provide the link in this thread.

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