On Wed, 2016-12-28 at 11:59 +0800, Peter Xu wrote:

On Tue, Dec 27, 2016 at 09:46:55PM +0200, Kalle Valo wrote:

quoted

Peter Xu [off-list ref] writes:

quoted

Looks like latest Linux master (4.10-rc1, 7ce7d89f) cannot work well
with my wireless card, which is:

  Intel Corporation Wireless 7260 (rev bb)

Boot message shows that no suitable firmware found:

    # journalctl -kp3
    Dec 27 16:38:00 kernel: Error parsing PCC subspaces from PCCT
    Dec 27 16:38:00 kernel: mmc0: Unknown controller version (3). You may experience problems.
    Dec 27 16:38:02 kernel: DMAR: DRHD: handling fault status reg 2
    Dec 27 16:38:02 kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 7200000000 [fault reason 05] PTE Write a
    Dec 27 16:38:03 kernel: tpm tpm0: A TPM error (6) occurred attempting to read a pcr value
    Dec 27 16:38:04 kernel: iwlwifi 0000:03:00.0: no suitable firmware found!

Linux stable/master (Linux 4.8-rc8, 08895a8b6b) works for me. And no
further tests have been done yet.

Is this a known issue? Please let me know if anyone wants more info or
logs, since this error triggers easily (everytime I boot).

The error message isn't really telling much to the user (hint hint) but
I suspect this is by design:

"iwlwifi: remove support for fw older than -17 and -22

Right, we only maintain support for a certain number of firmware
versions.  The FW APIs change with time and we don't want to keep all
legacy code supporting old firmwares in the driver forever.

I agree that "no suitable firmware found!" is a bit scarce.  I'll see
if we can improve that with something: "no suitable firmware found! You
need iwlwifi-7260-17.ucode (<link to git>)".

quoted

FW versions older than -17 for 3160 and 7260 and older than -22 for
newer NICs are not supported anymore.  Don't load these versions
and remove code that handles them."

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4b87e5af638b6056bd6c20b0954d09a5a58633be

Adding luca.

Thanks for the triage.

Larry's link for -17 firmware solved my issue. Though I still don't
know whether it is too aggresive if we just remove the support for -16
(which is the one I was using with the old 4.6 kernel, btw I am using
Fedora 24, which is relatively new as well).

I don't think we are very aggressive, we have been supporting -17 since
v4.3:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5865f3658ba37c54e346b0fdee08a1c7a152681b

And we have published the firmware about half a year ago:

http://git.kernel.org/cgit/linux/kernel/git/firmware/linux-firmware.git/commit/iwlwifi-7260-17.ucode?id=f2cf4d67e8eced29c8a473d3a27057aa2df57c42

I understand your concern, but if you want to be on the bleeding-edge
kernel, you should be on the bleeding-edge linux-firmware as well. ;)

But as I said, I'll try to improve the error message, as that should
make it easier to figure out.

--
Cheers,
Luca.