Lenovo T540p intermittent network problem

[Barry Du Plessis]

Hi

I recently installed Qubes R3.2 on my Lenovo T540p.  It installed and is running.  The wifi card in the machine is an Intel Wireless 7260.  Qubes does pick this up, and connects to my wifi, BUT the connection is intermittend.  If I ping (e.g.) ping www.google.com, I will get a packet loss of anything between 20% to 50%.

I have previously installed Ubuntu on the same hardware, and had a similar problem there, which I solved by disabling 802.11n on the wireless (add "options iwlwifi 11n_disable=1" to /etc/modprobe.d/iwlwifi.conf).

However, this does not seem to work on Qubes - I have added the file in both a dom0 and net-sys terminal (as root), and in both cases the file disappeared after rebooting the system and the problem remains.

I have searched Google and the qubes groups, but could not find a solution to this problem.  Can someone please either tell me how/where to set the 11n_disable parameter, or else have another solution for the intermittent network problem?  It is at the moment impossible to use the Internet or install software because of this.

Thanks

Barry

[Unman]

Hi Barry -
You need to understand a core feature of Qubes - the use of Templates to
back individual qubes. There is a good explanation here:
www.qubes-os.org/doc/getting-started

So you can make a permanent change by altering the Template on which
your sys-net is based.
It's also possible to make individual changes by putting them in to
/rw/config/rc.local in the qube - Look here:
www.qubes-os.org/doc/config-files/
Remember to chmod +x rc.local if you want the changes to take effect on
boot.

There is another mechanism - the use of bind-dirs to have a persistent
config file in a Template-based qube. Again, that's covered inn the
docs.

cheers

unman