How can i disable Wifi 6

Sat Apr 29 14:15:09 PDT 2023

Hi

My new notebook has Qualcomm Atheros QCNFA765 wifi-card but it does not 
play well with the router of my internet provider.
In Windows i could force the wifi-card to Wifi 5 mode by setting the 
"wireless mode".
How can i do the same in Linux ? I could not find a description of the 
parameters for ath11k.
I'm using Ubuntu 23.04 and the driver is ath11k_pci.

Thanks for your support
Jakob