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

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Message-ID: <d8e69f9c91efc5d2529082a7dcee3fedef3211db.camel@intel.com>
Date:   Wed, 4 Jan 2023 08:50:10 +0000
From:   "Coelho, Luciano" <luciano.coelho@...el.com>
To:     "chiluk@...ntu.com" <chiluk@...ntu.com>
CC:     "regressions@...mhuis.info" <regressions@...mhuis.info>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "Greenman, Gregory" <gregory.greenman@...el.com>,
        "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@...tmann.org" <marcel@...tmann.org>
Subject: Re: [regression] Bug 216753 - 6e 6 ghz bands are disabled since 5.16
 on intel ax211

On Tue, 2023-01-03 at 11:37 -0600, Dave Chiluk wrote:
> 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);

Dave, this code was added there for a reason.  But as I said, I'm not
working with WiFi anymore, so I raised the question internally and
Gregory or someone else will respond to you with the details soon.

--
Cheers,
Luca.