On Sun, Jun 19, 2022 at 02:43:20PM +0000, Lucas wrote: > Hello, > > As the subject reads, yesterday I update my Lenovos T420 and X230. > During sysupgrade autoupgrade and afterwards I started getting firmware > errors and wifi became unusable. I reached stsp@ off-list to know how to > provide the most information possible and he shared [1] with me. I > applied the patch in [2] and I have 2 "traces" of different AP, and I'll > get another two during the rest of the day. AP1 is a residential ISP, > AP2 is a smartphone hotspot. The trace for AP1 includes dmesg. > > Also, to give it a shot, I reverted the last changes to if_iwn.c, Git > commit 03baa64391cc86175b030d132ae900417665b92f, CVS r1.259. Running > this kernel, wifi works again on my *X230*. Both laptops report the card > as > > iwn0 at pci2 dev 0 function 0 "Intel Centrino Advanced-N 6205" rev 0x34: msi, > MIMO 2T2R, MoW > > so I guess it'll also work in the T420, but haven't tried it yet.
I have reverted the change. After more off-list discussion with Christian Schulte it is clear that the change wasn't actually helping with the problem anyway. We still don't know what is happening there, just that the issue can be avoided by moving APs to a channel other than 13. Sorry about the temporary breakage.
