Difficult to reconnect (RTL8191SU, authentication with xx:xx timed out)

Difficult to reconnect (RTL8191SU, authentication with xx:xx timed out)

[Szőts Ákos]

Dear list members,

I have an RTL8191SU USB WiFi card (with rtl8192su driver) and unfortunately it 
looses network connection many times (reproducibly, and only under Linux).

Re-connecting to the previous network is also very difficult because the 
following error messages appear in dmesg during that:
[164797.994074] wlp0s26f7u2: authenticate with 90:f6:52:7d:6e:0e
[164798.031433] wlp0s26f7u2: direct probe to 90:f6:52:7d:6e:0e (try 1/3)
[164798.232411] wlp0s26f7u2: direct probe to 90:f6:52:7d:6e:0e (try 2/3)
[164798.433700] wlp0s26f7u2: direct probe to 90:f6:52:7d:6e:0e (try 3/3)
[164798.634457] wlp0s26f7u2: authentication with 90:f6:52:7d:6e:0e timed out

When I turn the adapter off (in KDE network manager app), wait about ten 
seconds, then turn it on again, it can suddenly connect again flawlessly.

Since I'm not a kernel developer, I don't know the perfect ways to track down 
these kinds of issues. Anyway, I ran the following command when I tried to 
connect multiple times and the driver refused:
trace-cmd record -T -e mac80211 -e cfg80211

I uploaded the output which you can reach here: 
http://home.sch.bme.hu/~szotsaki/trace-auth-time-out.dat

I also traced out the firware version:
printk(KERN_WARNING "Version: %u\n", hal_get_firmwareversion(rtlpriv));
-> Version: 36926 (which is strange because in the source everywhere a v52-
like numbers are referenced).

Do you have time to fix this issue and if so, can I provide some more useful 
input?

Thank you very much!

All the best,

Ákos