[Nix-dev] A few beginner issues

[Nick Sabalausky]

On 07/29/2016 11:14 PM, Peter Hoeg wrote:
>>>> 2. When I'm in KDE4 on NixOS, I can change the display resolution,
>>>> but the
>>>> change doesn't persist across a reboot. Why is this? What is the
>>>> correct way
>
> Could you try with kde5 instead of kde4? KDE5 is getting all the love
> these days so maybe a bug snuck in there?
>

Ok, just tried now...

Gotta say, I'm thrilled how painless it was to switch from KDE4 to KDE5 
and back again. Exactly the sort of reason I've been unsatisfied with 
other distros and so intrigued by NixOS. Just changed the 
"...kde4.enable = true"/"...kdm.enable = true" to "...kde5.enable = 
true"/"...sddm.enable = true" and "nixos-rebuild switch && reboot". And 
just reverse the changes (or select old config from boot menu) to undo 
it, and it just works :) Really like the idea of being able to try 
things out without as much risk of messing things up or being stuck with 
the changes.

In KDE5/SDDM, my resolution settings changes DO persist, although only 
after the login screen. Which I suppose makes sense since I was changing 
the setting AS a logged in user. Seems as though with KDE4/KDM it just 
isn't loading any per-user resolution setting upon login (or maybe isn't 
saving it).

Is there a NixOS way to set a default resolution (presumably in 
configuration.nix) that would apply to the login screen? Or would it 
just be though whatever the display manager's (or X's) normal approach 
for doing that as with any other linux distro?