linux-kernel - Re: [regression] Bug 216753 - 6e 6 ghz bands are disabled since 5.16 on intel ax211

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Message-ID: <CAMfi-DTwX2nvP58FRb6NaGMyWO0SBo9W=Fpdtr=XfNRzkqAwHw@mail.gmail.com>
Date:   Tue, 3 Jan 2023 11:37:19 -0600
From:   Dave Chiluk <chiluk@...ntu.com>
To:     "Coelho, Luciano" <luciano.coelho@...el.com>
Cc:     "regressions@...mhuis.info" <regressions@...mhuis.info>,
        "Greenman, Gregory" <gregory.greenman@...el.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "johannes@...solutions.net" <johannes@...solutions.net>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Marcel Holtmann <marcel@...tmann.org>
Subject: Re: [regression] Bug 216753 - 6e 6 ghz bands are disabled since 5.16
 on intel ax211

On Thu, Dec 1, 2022 at 5:33 AM Coelho, Luciano <luciano.coelho@...el.com> wrote:
>
> On Thu, 2022-12-01 at 11:14 +0100, Thorsten Leemhuis wrote:
> > Hi, this is your Linux kernel regression tracker.
> >
> > Luca, I noticed a regression report in bugzilla where I'd like your
> > advice on. To quote https://bugzilla.kernel.org/show_bug.cgi?id=216753
>
> Hi Thorsten wearing-the-regression-hat, 🙂
>
> I'm not the maintainer of iwlwifi anymore, so I'm adding the new
> maintainer here, Gregory Greenman.
>
> Gregory, can you take a look?
>

@Gregory Greenman as I'm sure this got buried over the holidays, can
you take a look at this and advise?  This is definitely a regression,
but I don't think a lot of people are noticing it or don't yet have
6ghz access points.  I can write up a patch removing the offending
commit (698b166ed), or I can add an iwlwifi option to ignore the 6e
ACPI bit.  Which would you prefer?

Dell has been of little help which I pretty much expected.

@Luciano, as you were the author of the original change, and I'm not
familiar enough with ACPI, is the below code reading the enable bits
from the BIOS ACPI table or is this somehow coming out of the network
card through some UEFI extensions?  I'm trying to figure out which of
Dell or Intel need to update their firmware?  I think some Lenovo's
have similar problems, so I suspect it's a BIOS ACPI table problem.

 ret = iwl_acpi_get_dsm_u32(mvm->fwrt.dev, 0,
                                   DSM_FUNC_ENABLE_6E,
                                   &iwl_guid, &value);

Thanks,
Dave.