The other possibility is that this is actually a bios bug, as the DSM is being read out of ACPI. In which case that would be Dell's fault. Either way I appreciate any guidance you can provide. Thanks, Dave. On Thu, Dec 1, 2022 at 5:33 AM Coelho, Luciano <luciano.coelho@xxxxxxxxx> 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? > > > > > It looks like the self-managed regulatory information is causing the 6ghz band to be disabled on my AX211 (in the US). > > > iw reg get shows no 6ghz bands (output at the bottom). > > > > > > $ sudo iw phy0 channel > > > ... > > > Band 4: > > > * 5955 MHz [1] (disabled) > > > * 5975 MHz [5] (disabled) > > > * 5995 MHz [9] (disabled) > > > ....(continues with all disabled > > > * 7115 MHz [233] (disabled) > > > ... > > > > > > I was able to narrow this down to having been introduced during the 5.16 development window, as 5.15.79 linux-stable kernel works and the 5.16.12 does > > > not (earlier builds of 5.16 kernel fail to boot on my machine for some reason). > > > > > > I found https://community.frame.work/t/kernel-5-16-6ghz-disabled-ax210/15675/5 > > > and they imply that this regression was introduced by > > > 698b166ed3464e1604a0e6a3e23cc1b529a5adc1 > > > I haven't independently verified this commit as the definitive issue. > > > > You authored 698b166ed346 ("iwlwifi: mvm: read 6E enablement flags from > > DSM and pass to FW"). As it is a regressions is ideally should be dealt > > with. But this area in tricky due to the legal implications. Hence I > > wonder: is there anything we can do about this, or is this simply a case > > where we have to bite the bullet and live with this regression? > > > > Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) > > > > P.S.: As the Linux kernel's regression tracker I deal with a lot of > > reports and sometimes miss something important when writing mails like > > this. If that's the case here, don't hesitate to tell me in a public > > reply, it's in everyone's interest to set the public record straight.
