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lightdm-fb: add hotplug support for display port #466

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lightdm-fb: add hotplug support for display port #466

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arulcse2008
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Add hotplug support for display port.
Add lightdm-fb package to lxde.yml by default

Fixes: #463

@arulcse2008
lightdm-fb: add hotplug support for display port
0cd758c 
Add hotplug support for display port.
Add lightdm-fb package to lxde.yml by default

Fixes: siemens#463

Signed-off-by: Arulpandiyan Vadivel <[email protected]>
@arulcse2008
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@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:~#

@arulcse2008 arulcse2008 mentioned this pull request Jul 7, 2023
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jan-kiszka
jan-kiszka reviewed Jul 7, 2023
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recipes-core/lightdm-fb/files/postinst
#

# Add support for hotplug of Display Port
sed -i 's/LABEL="systemd_end"/SUBSYSTEM=="graphics", KERNEL=="fb0", SYMLINK="fb0", TAG+="systemd"\nLABEL="systemd_end"/g' /lib/udev/rules.d/99-systemd.rules
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Please ship and install a file to /etc. Make this package a customization package.

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in addition, the whole purpose of rules.d is to let people add their own rules (in separate files)

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The correct debian way would be to use dh_installudev. By that, the file also gets correctly numbered. Just put it into its own package and add a file <package>.udev in the debian folder. For details, see man dh_installudev.

jan-kiszka
jan-kiszka reviewed Jul 7, 2023
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recipes-core/lightdm-fb/files/postinst
# Add support for hotplug of Display Port
sed -i 's/LABEL="systemd_end"/SUBSYSTEM=="graphics", KERNEL=="fb0", SYMLINK="fb0", TAG+="systemd"\nLABEL="systemd_end"/g' /lib/udev/rules.d/99-systemd.rules

sed -i '/plymouth/d' /lib/systemd/system/lightdm.service
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Nope, thats's what /etc/systemd is for.

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it is also unclear what we are doing here (I mean I understand that we are essentially killing every single line where the word plymouth can be found but why?)

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

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Will this receive an update?

@arulcse2008
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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

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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

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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

chombourger
chombourger reviewed Jul 25, 2023
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recipes-core/lightdm-fb/files/postinst
sed -i 's/LABEL="systemd_end"/SUBSYSTEM=="graphics", KERNEL=="fb0", SYMLINK="fb0", TAG+="systemd"\nLABEL="systemd_end"/g' /lib/udev/rules.d/99-systemd.rules

sed -i '/plymouth/d' /lib/systemd/system/lightdm.service
sed -i '/Service/i [email protected] [email protected]\[email protected] [email protected]\nBindsTo=dev-fb0.device\nAfter=dev-fb0.device\n' /lib/systemd/system/lightdm.service
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please use a systemd dropin (we should avoid patching systemd units from other packages)

chombourger
chombourger reviewed Jul 25, 2023
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recipes-core/lightdm-fb/files/postinst
@@ -0,0 +1,12 @@
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if we ship a postinst script, we should ideally have a postrm script to support uninstallation

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Waiting for an update...

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Still no update - while gates are closing...

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IOT2050 Advanced PG2 board Display enumeration
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@arulcse2008 @jan-kiszka @chombourger @fmoessbauer