Re: F36 Change: Wayland by Default for SDDM (Self-Contained Change proposal)

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On Wed, 9 Feb 2022 at 11:00, Neal Gompa <ngompa13@xxxxxxxxx> wrote:
>
> On Wed, Feb 9, 2022 at 5:24 AM Jonathan Wakely <jwakely@xxxxxxxxxx> wrote:
> >
> > On Tue, 18 Jan 2022 at 14:30, Ben Cotton <bcotton@xxxxxxxxxx> wrote:
> > >
> > > https://fedoraproject.org/wiki/Changes/WaylandByDefaultForSDDM
> > >
> > > = Wayland by Default for SDDM =
> > >
> > > == Summary ==
> > > Change the default display server mode for SDDM to use a Wayland-based
> > > greeter rather than an X11-based one.
> > >
> > > == Owner ==
> > > * Name: [[User:Ngompa|Neal Gompa]], [[User:Rdieter|Rex Dieter]],
> > > [[User:Jgrulich|Jan Grulich]]
> > > * Email: ngompa13@xxxxxxxxx, rdieter@xxxxxxxxx, jgrulich@xxxxxxxxxx
> > > * Product: KDE Spin, Kinoite
> > > * Responsible WG: KDE SIG
> > >
> > >
> > > == Detailed Description ==
> > > With [https://github.com/sddm/sddm/pull/1393 the work done upstream in
> > > SDDM to support using a Wayland based greeter] and
> > > [[Changes/ReplaceFbdevDrivers|the introduction of SimpleDRM to fix the
> > > broken fallback when platform drivers are unavailable]], it is now
> > > possible for the Fedora KDE variants (the regular spin and Kinoite) to
> > > move to Wayland for the login manager, which effectively completes the
> > > switch to Wayland for these variants.
> > >
> > >
> > > == Benefit to Fedora ==
> > > As originally detailed in [[Changes/WaylandByDefaultForPlasma|the
> > > Change to switch Plasma to Wayland by default]], Fedora is a leader in
> > > advancing the adoption of the Wayland protocol as part of the overall
> > > strategy to improve the Linux graphical software stack. We have been
> > > successful in helping drive Wayland forward in the Plasma Desktop, and
> > > we intend to do the same for SDDM.
> > >
> > > == Scope ==
> > > * Proposal owners:
> > > ** Upgrade {{package|sddm}} to the latest snapshot and introduce
> > > mutually exclusive <code>sddm-wayland-generic</code> and
> > > <code>sddm-x11</code> greeter configuration packages.
> > > ** Modify {{package|plasma-workspace}} to switch SDDM to Wayland
> > > *** Enable installation of the SDDM Wayland configuration snippet and
> > > ship as <code>sddm-wayland-plasma</code> that is mutually exclusive
> > > with the other sddm greeter configuration packages. This package will
> > > supplement {{package|sddm}} and <code>plasma-workspace-wayland</code>
> > > to be automatically installed together.
> > > ** Modify <code>@kde-desktop</code> comps group for Fedora Linux 36 to
> > > include <code>sddm-wayland-plasma</code> for the media.
> > >
> > >
> > > * Other developers: N/A (not needed for this Change)
> > >
> > > * Release engineering: [https://pagure.io/releng/issue/10536 #10536]
> > > * Policies and guidelines: N/A (not needed for this Change)
> > > * Trademark approval: N/A (not needed for this Change)
> > > * Alignment with Objectives: N/A
> > >
> > >
> > > == Upgrade/compatibility impact ==
> > > On upgrade to Fedora Linux 36, SDDM will be transparently switched
> > > from the X11 greeter to the Wayland one leveraging kwin. In order to
> > > override this, the user can do one of the following:
> > > * Drop in a configuration file in <code>/etc/sddm.conf.d</code> to set
> > > the display server back to X11
> > > * Swap back to X11 with the configuration package: <code>dnf swap
> > > sddm-wayland-plasma sddm-x11</code>
> > >
> > >
> > > == How To Test ==
> > > Once the SDDM and Plasma Wayland changes are made, Rawhide users can
> > > try this by using nightly KDE ISOs and using them normally to install
> > > and run a Rawhide KDE Plasma environment.
> > >
> > > == User Experience ==
> > > Ideally, there should be no noticeable impact on the user experience,
> > > though users may notice that things operate more smoothly and with
> > > slightly lower resources.
> >
> >
> > Last time I tried, I couldn't use Synergy and Wayland together, so I
> > use X11 sessions with KDE still. Will this change only affect the
> > pre-login greeter screen, or does it also affect the lock screen when
> > a running X11 session is locked (either explicitly or after the
> > timeout)? Currently I can still use the mouse and keyboard from a
> > different machine to unlock that lock screen. If it starts using
> > Wayland that won't work. It might be worth mentioning that for the
> > user experience for other Synergy users.
>
> SDDM only affects pre-login, just like GDM for GNOME. If you select
> X11 at login, the lock screen will also use X11.

Great, thanks!
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