On Thursday, February 18, 2021 4:33 PM, Willy Tarreau <w...@1wt.eu> wrote: > Usually you pick an LTS kernel for a specific hardware. If it > works that's great. But you cannot expect hardware to suddenly start to > work in the middle of a stable kernel. Sometimes it happens (PCI IDs) but > that's basically all and that's not their purpose.
It was the other way around. Fine working in-tree driver got broken by backported "fixes". I did mention bit-rot. In-tree iwlwifi worked half-ok on early 4.9.y stable. If connection somehow de-autheticated (out of radio range or whatever) it crashed the kernel spectacularly. Eventually that was fixed and in-tree iwlwifi worked fine on 4.9.y and 4.14.y stable kernels. On second half of year 2020 (don't remember exactly when) iwlwifi started causing erratic behavior when some random process terminated, as if some exit processing left some resources un-freed or something weird like that. Upgraded to 4.19.y kernels in hope to fix the issue. Nope, same problems continued there as well. Replacing in-tree iwlwifi with out-of-tree upstream Intel version solved the problem for me. -- Jari Ruusu 4096R/8132F189 12D6 4C3A DCDA 0AA4 27BD ACDF F073 3C80 8132 F189
