So I have been trying to reach out in aim to get this driver fixed as its regressed now to a total non working state.
The card can see access points, but thats about as good as it gets as trying to connect to any networks ( either 2.4 ot 5 Ghz ) results in the following,
wlp3s0: CTRL-EVENT-SCAN-FAILED ret=-22 retry=1
( alot of these ) which then resets connection status with a failed timeout.
I am currently running FedoraCore 30 with the 5.2.5-200 kernel updated from 5.1.x yesterday. The firmware loaded is,
loaded firmware version 9.221.4.1 build 25532 op_mode iwldvm
Now with all that said, using a Linux Mint live boot from a usb device yeilds the card working fine at both 2.4 and 5ghz speeds, it connects within seconds. The kernal in this live boot is 4.15.x and uses the same firmware build as my FC install.
I'm also using a "Intel Corporation Centrino Ultimate-N 6300 (rev 3e)"
card and it's working perfectly with 5.3.0-rc4-wt here.
(And with most wireless-testing kernels for the last years, too..)
Now there was one noteworthy bug in the last year we handled on the
mailing list:
https://lore.kernel.org/linux-wireless/87k1rk1af5.fsf@xxxxxxxxxxxxxxxxxxxxxxxx/
But then this was a null pointer and does not match to what you observe.
(And that really should be fixed in any 5.2 kernel...)
I'm using a Gentoo ~amd64 system and wpa_supplicant more or less
tracking git upstream and the wireless-testing kernels with the same
firmware as you.
So whatever it is, it's not affecting me. I would suggest to try a
vanilla 5.2 kernel and maybe also an updated wpa_supplicant version next...
Alexander
