lightdm-fb: add hotplug support for display port

[arulcse2008]

Add hotplug support for display port. Add lightdm-fb package to lxde.yml by default

Fixes: https://github.com/siemens/meta-iot2050/issues/463

[arulcse2008]

@jan-kiszka @BaochengSu Kindly help to review the changes

Display port hotplug is working logs were attached for reference below.

root@iot2050-debian:~# dmesg |tail
[   12.293291] remoteproc remoteproc3: powering up b004000.rtu
[   12.301086] remoteproc remoteproc3: Booting fw image ti-pruss/am65x-sr2-rtu0-prueth-fw.elf, size 30872
[   12.310444] remoteproc remoteproc3: remote processor b004000.rtu is now up
[   12.317351] remoteproc remoteproc4: powering up b00a000.txpru
[   12.327432] remoteproc remoteproc4: Booting fw image ti-pruss/am65x-sr2-txpru0-prueth-fw.elf, size 37328
[   12.336964] remoteproc remoteproc4: remote processor b00a000.txpru is now up
[   12.345967] net eno2: started
[   33.839519] tps62363-vout: disabling
[   63.971848] Console: switching to colour frame buffer device 240x67
[   64.011260] tidss 4a00000.dss: [drm] fb0: tidssdrmfb frame buffer device
root@iot2050-debian:~# systemctl status lightdm
● lightdm.service - Light Display Manager
     Loaded: loaded (8;;file://iot2050-debian/lib/systemd/system/lightdm.service/lib/systemd/system/lightdm.service8;;; enabled; preset: enabled)
     Active: active (running) since Tue 2023-02-28 11:18:51 UTC; 11s ago
       Docs: 8;;man:lightdm(1)man:lightdm(1)8;;
   Main PID: 523 (lightdm)
      Tasks: 7 (limit: 2289)
     Memory: 99.6M
        CPU: 1.398s
     CGroup: /system.slice/lightdm.service
             ├─523 /usr/sbin/lightdm
             ├─529 /usr/lib/xorg/Xorg :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
             └─591 lightdm --session-child 15 22

Feb 28 11:18:50 iot2050-debian systemd[1]: Starting lightdm.service - Light Display Manager...
Feb 28 11:18:51 iot2050-debian systemd[1]: Started lightdm.service - Light Display Manager.
Feb 28 11:18:51 iot2050-debian lightdm[523]: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: Th>
Feb 28 11:18:55 iot2050-debian lightdm[552]: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: Th>
Feb 28 11:18:55 iot2050-debian lightdm[552]: pam_unix(lightdm-greeter:session): session opened for user lightdm(uid=105) by (uid=0)
root@iot2050-debian:~# ls -la /dev/fb0
crw-rw---- 1 root video 29, 0 Feb 28 11:18 /dev/fb0
root@iot2050-debian:~#

[jan-kiszka]

And the commit messages of the patch should explain what is going on, not just list what it does.

[jan-kiszka]

Will this receive an update?

[arulcse2008]

Will this receive an update?

Yes we will get an update,

Please ship and install a file to /etc. Make this package a customization package.

Can you help me to understand what do you mean by making customization package? Rest of the comments I can understand

[jan-kiszka]

Create something like customizations-lxde or add your custom lightdm.service to https://github.com/siemens/meta-iot2050/tree/master/recipes-core/customizations-example if the lxde image is selected. The former might be cleaner, see also https://github.com/siemens/meta-iot2050/tree/master/recipes-core/customizations-swupdate

[arulcse2008]

Create something like customizations-lxde or add your custom lightdm.service to https://github.com/siemens/meta-iot2050/tree/master/recipes-core/customizations-example if the lxde image is selected. The former might be cleaner, see also https://github.com/siemens/meta-iot2050/tree/master/recipes-core/customizations-swupdate

Thanks for the information, I will update the PR shortly

[jan-kiszka]

Waiting for an update...

[jan-kiszka]

Still no update - while gates are closing...