I have the same problem: "firmware: failed to load iwl-debug-yoyo.bin (-2)" in the log. I am using Debian linux-image-5.9.0-5-amd64-unsigned (= 5.9.15-1).
I am no expert but i don't think this log message is pressent in Linux mainline, only in Debian. The upstream patch [0] that Jeremy mentions is not for this message but for the upstream debug message: "Direct firmware load for iwl-debug-yoyo.bin failed with error -2" This message is now not shown anymore. The message that this bug report handles is "firmware: failed to load iwl-debug-yoyo.bin (-2)" This message is not in upstream Linux but instead comes from an ancient Debian kernel patch from 2012 that is still applied on debian kernel 5.10.4-1.(firmware_class-log-every-success-and-failure.patch [1]) While the mainstream Linux logging evolved a lot since 2012 i doubt that this patch which duplicates error logging is still wise to use. [0]: https://patchwork.kernel.org/patch/11625759/ [1]: https://sources.debian.org/src/linux/5.10.4-1/debian/patches/bugfix/all/firmware_class-log-every-success-and-failure.patch/
