Give every ubutunu user by default rt capabilities

[jviereck]

Right now we require every user to be added to the realtime user group. This looks like a unnecessary overhead.

• If possible, we should just use the default ubuntu user group and adjust the line here accordingly 1.

• In addition to the users of the real-time group to be able to edit the /dev/cpu_dma_latency file in order to ensure real-time capabilities.

Thoughts @vincentberenz @MaximilienNaveau @mwuethri ?

[vincentberenz]

Sounds like a good idea to me. Could be done this way : https://askubuntu.com/questions/963164/automatically-add-users-to-groups

[jviereck]

Hi Vincent, thanks for figuring out the way to add the user directly to the realtime user group.

One downside with this solution is how to deal with existing users already defined on the machine.

A ubuntu user is automatically added to the group sambashare. How about we give this usergroup realtime capabilities by default?

[vincentberenz]

@jviereck this sounds a little bit like a hack. I'll try to figure out another way

[MaximilienNaveau]

I update the issue above, as one more problem arose.
@vincentberenz @luator @jviereck @mwuethri

[jviereck]

@vincentberenz did you by any chance find a way for this?