Created attachment 244581 [details]
iwlwifi dmesg output from kernel 4.8.7 and firmware a179db97

I recently updated my kernel from 4.7.2 to 4.8.7. A few days later, I updated my firmware, from commit dca88401 to a179db97, and started running into iwlwifi issues.

The most noticeable difference between 4.7.2 and 4.8.7 is the firmware version being loaded.

4.7.2 with firmware a179db97 (works):
[1.312428] iwlwifi 0000:04:00.0: enabling device (0000 -> 0002)
[1.331643] iwlwifi 0000:04:00.0: loaded firmware version 21.302800.0 op_mode iwlmvm
[1.340847] iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208

4.8.7 with firmware a179db97 (broken on boot):
[1.301575] iwlwifi 0000:04:00.0: enabling device (0000 -> 0002)
[1.318870] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-24.ucode failed with error -2
[1.320021] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-23.ucode failed with error -2
[1.330996] iwlwifi 0000:04:00.0: loaded firmware version 22.361476.0 op_mode iwlmvm
[1.345931] iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208
...
[5.181979] iwlwifi 0000:04:00.0: Microcode SW error detected.  Restarting 0x82000000.

Rolling back the installed firmware to dca88401, so that 4.8.7 uses firmware version 21.302800.0, fixes the issue. So there seems to be compatibility issues with the latest firmware, or 4.8 is picking the wrong firmware file to load.