Comment 87 for bug 1730924

Created attachment 260791
dmesg log and data file from firmware dump

Attached is a tarball with a dmesg log and the /sys/devices/virtual/devcoredump/devcd1/data
 file resulting after requesting a firmware dump.

Note that this is a 4.14 kernel, modified for Surface Pro use, but with the mwifiex module identical to the current tip of the 4.14 tree. (This tree to be precise https://github.com/jakeday/linux-surface).

I also get this result with a variety of other kernels; it seems specific to this hardware + firmware, and perhaps to this particular use case. (It is an odd case; a modified Fedora Core 23 stack.)

Nicely, I now get fairly consistent behavior. That is, upon first launch, the wifi stack is very laggy - you'll get ping times of 43, 100, 243, 79, and so on (when you'd expect steady 1.43). That shows up in interactive ssh sessions. Further, after a modest amount of use (usually just a few meg will do it), the wireless will stop working. You also can no longer successfully reboot or poweroff; you get a hang at kernel shutdown time.

The attached came from a session with a clean boot, debug_mask 0xffffffff, and about 3M of the kernel source downloaded before the wifi stopped functioning.