nvidia-prime and sddm

[Alberto Milone]

On 31-03-15 19:29:54, Jonathan Riddell wrote:
> We've switched to SDDM in Kubuntu but alas I know nothing about
> nvidia.  Alberto I think you're the dude who does know?
>
> nvidia-prime is the proprietary driver we need to care about for NVidia users?
>
> Last cycle I put in an alternate so it depended on lightdm | sddm but
> that seems to have been removed.  Is there more sddm integration
> needed?
>
> Jonathan

Hi Jonathan,

I maintain both the nvidia packages and nvidia-prime. What nvidia-prime
does is provide a way to use hybrid graphics (Intel+NVIDIA) in Ubuntu.

While I don't recall dropping he alternate dependency on sddm (which is
entirely possible that I did), maybe sddm doesn't really work with
nvidia-prime.

If you want hybrid graphics to work (as it does in Ubuntu), you'll need
support for something like the following stanzas from lightdm:

display-setup-script=/sbin/prime-offload
display-stopped-script=/sbin/prime-switch

The first line is executed after X starts, whereas the second line is
executed after stopping X (and before starting a new one).

Does sddm support that?

I should also modify the relevant upstart job in ubuntu-drivers-common
(the systemd unit already works).

Regards,

--
Alberto Milone
Software Engineer
Hardware Enablement Team
Professional and Engineering Services