## INTRODUCTION
DDM is a fork of SDDM. And use single compositor and session management functionality.
SDDM is a modern display manager for X11 and Wayland sessions aiming to
be fast, simple and beautiful.
It uses modern technologies like QtQuick, which in turn gives the designer the ability to
create smooth, animated user interfaces.
SDDM is extremely themeable. We put no restrictions on the user interface design,
it is completely up to the designer. We simply provide a few callbacks to the user interface
which can be used for authentication, suspend etc.
To further ease theme creation we provide some premade components like a textbox,
a combox etc.
There are a few sample themes distributed with SDDM.
They can be used as a starting point for new themes.
## SCREENSHOTS
## VIDEOS
* [Video background](https://www.youtube.com/watch?v=kKwz2FQcE3c)
* [Maui theme 1](https://www.youtube.com/watch?v=-0d1wkcU9DU)
* [Maui theme 2](https://www.youtube.com/watch?v=dJ28mrOeuNA)
## RESOURCES
* [Issue tracker](https://github.com/ddm/ddm/issues)
* [Wiki](https://github.com/ddm/ddm/wiki)
* [Mailing List](https://groups.google.com/group/ddm-devel)
* IRC channel `#ddm` on [chat.freenode.net](https://webchat.freenode.net?channels=ddm)
## INSTALLATION
Qt >= 5.15.0 is required to use SDDM.
SDDM runs the greeter as a system user named "ddm" whose home directory needs
to be set to `/var/lib/ddm`.
If pam and systemd are available, the greeter will go through logind
which will give it access to drm devices.
Distributions without pam and systemd will need to put the "ddm" user
into the "video" group, otherwise errors regarding GL and drm devices
might be experienced.
## VIRTUAL TERMINALS
SDDM is assumed to start at the tty specified by the cmake variable
SDDM_INITIAL_VT which is an integer and defaults to 1.
If SDDM_INITIAL_VT wasn't available, SDDM will use the next available one
instead.
You can override SDDM_INITIAL_VT if you want to have a different one if,
for example, you were planning on using tty1 for something else.
## LICENSE
Source code of SDDM is licensed under GNU GPL version 2 or later (at your choosing).
QML files are MIT licensed and images are CC BY 3.0.
## TROUBLESHOOTING
### NVIDIA Prime
Add this at the bottom of the Xsetup script:
```sh
if [ -e /sbin/prime-offload ]; then
echo running NVIDIA Prime setup /sbin/prime-offload, you will need to manually run /sbin/prime-switch to shut down
/sbin/prime-offload
fi
```
### No User Icon
SDDM reads user icon from either ~/.face.icon or FacesDir/username.face.icon
You need to make sure that SDDM user have permissions to read those files.
In case you don't want to allow other users to access your $HOME you can use
ACLs if your filesystem does support it.
```sh
setfacl -m u:ddm:x /home/username
setfacl -m u:ddm:r /home/username/.face.icon
```
### Custom DPI
In order to set custom DPI for high resolution screens you should configure
Xorg yourself. An easy way is to pass an additional argument to Xorg.
Edit ``/etc/ddm.conf``, go to the ``X11`` section and change ``ServerArguments`` like this:
```
ServerArguments=-nolisten tcp -dpi 192
```
to set DPI to 192.
As an alternative you can edit Xorg configuration ``xorg.conf``, please refer to the
Xorg documentation.
