RHEL 9

[aclater]

I've begun trying to play with projecteur on RHEL9 by installing the Fedora 34 RPM, and I've found a few issues.

[aclater@lennon ~]$ uname -a;cat /etc/redhat-release 
Linux lennon 5.14.0-70.17.1.el9_0.x86_64 #1 SMP PREEMPT Tue Jun 14 11:32:10 EDT 2022 x86_64 x86_64 x86_64 GNU/Linux
Red Hat Enterprise Linux release 9.0 (Plow)
[aclater@lennon ~]$ rpm -qa | grep -i projecteur
projecteur-0.9.2-1.x86_64

It appears that there is a dependency on qt5-qtwayland, which is not in the RPM spec file:

[aclater@lennon ~]$ QT_QPA_PLATFORM=wayland projecteur
[2022-07-14T13:07:58.031][inf][default] Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
[2022-07-14T13:07:58.037][wrn][qt.qpa.plugin] Could not find the Qt platform plugin "wayland" in ""
[2022-07-14T13:07:58.038][fat][default] This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.

Aborted (core dumped)

Once resolved, it appears that the application fails to write a configuration file and core dumps:

[aclater@lennon ~]$ QT_QPA_PLATFORM=wayland projecteur [2022-07-14T13:09:50.285][inf][default] Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway. [2022-07-14T13:09:50.292][wrn][default] QSocketNotifier: Can only be used with threads started with QThread [2022-07-14T13:09:50.351][err][projecteur.settings] Settings file '/home/aclater/.config/Projecteur/Projecteur.conf' not readable. [2022-07-14T13:09:50.351][wrn][projecteur.settings] Settings file '/home/aclater/.config/Projecteur/Projecteur.conf' not writable. [2022-07-14T13:09:50.351][inf][projecteur.virtualdevice] Created uinput device: /sys/devices/virtual/input/input27 mprotect failed in ExecutableAllocator::makeExecutable: Permission denied Segmentation fault (core dumped)

Once created, it seg faults on another permission error and core dumps:

[aclater@lennon ~]$ touch /home/aclater/.config/Projecteur/Projecteur.conf [aclater@lennon ~]$ QT_QPA_PLATFORM=wayland projecteur [2022-07-14T13:13:46.879][inf][default] Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway. [2022-07-14T13:13:46.885][wrn][default] QSocketNotifier: Can only be used with threads started with QThread [2022-07-14T13:13:46.947][inf][projecteur.virtualdevice] Created uinput device: /sys/devices/virtual/input/input28 mprotect failed in ExecutableAllocator::makeExecutable: Permission denied Segmentation fault (core dumped)

Any thoughts?

[jahnf]

Do have the uinput rule inside your udev rules?
See: https://github.com/jahnf/Projecteur/blob/develop/55-projecteur.rules.in
This should enable the user to create and open uinput devices.

Or if you can live without the button mapping feature: Try to start Projecteur with the
command line option --disable-uinput

I havn't had time and motivation to really investigate, but there seems to be all kind of issues with newer Ubuntu versions + wayland.
Qt with wayland + a bunch of different LInux distros that now have it by default is sadly a mess for this project.

[aclater]

I'll look into this later today!

[jahnf]

On another note: on newer Ubuntu versions (starting from 21.10 as far as I know) there are also issues related to uinput and (probably) wayland. No issues while opening or creating the uinput device, but the events sent to it seem to be blocked or not forwarded to Gnome.

[jahnf]

uinput issue can be resolved as it seems #175 , see draft PR #197