I have a dell XPS 15 (9560) and I've installed an intel wireless AC 9260 WiFi card. I'm running ubuntu 18.04
with kernel 4.17.14-041714-generic
. I get very realiable wifi connections, but it's extremely slow. After some testing, I found that it won't connect at a link speed higher than 54mb/s as reported in the gnome network manager applet.
I think for some reason the card is connecting at G speeds. The strange thing is my access point is set to WiFi A/N only on the 5GHz band so it shouldn't be possible. I've tried a lot of different askubuntu answers. The access point is set to only allow AES encryption. An interesting thing is this excerpt from iw list
:
...
Band 2:
Bitrates (non-HT):
* 6.0 Mbps
* 9.0 Mbps
* 12.0 Mbps
* 18.0 Mbps
* 24.0 Mbps
* 36.0 Mbps
* 48.0 Mbps
* 54.0 Mbps
Frequencies:
* 5180 MHz [36] (22.0 dBm) (no IR)
* 5200 MHz [40] (22.0 dBm) (no IR)
...
It appears Ubuntu thinks the card can only do up to 54mb/s. My Galaxy S9+ connects fine at 300mpbs+ so I don't believe it's an access point issue. Any idea how I can get a connection speed above 54mb/s? Thanks heaps!
UPDATE:
After a recent string of updates it seems to have fixed itself.
Best Answer
Not Ubuntu. It is the driver; the support for your card is fairly new (it was added to debian july 2018) so it might just be lacking support for this.
2 things to try:
On ubuntuforums there is a suggestion ...
11n_disable=1
or11n_disable=8
in/etc/modprobe.d/iwlwifi.conf
I would file a bug report on this against linux-firmware iwlwifi.