I'm creating a display manager (dm) in python, which waits to Xorg to start in order to run the GUI.
Python
(omitted unnecessary code like widgets and classes and functions)
import os
(more imports of PyQt6 etc ...)
.......
class LoginWindow( QMainWindow ):
def __init__(self):
super().__init__()
# Make window full screen
self.setWindowFlags(Qt.WindowType.FramelessWindowHint |
Qt.WindowType.WindowStaysOnTopHint
)
..........
.......... (unnecessary code to the problem)
def cancel(self, window):
if not window :
...
def start_x11():
xorg =subprocess.run("Xorg :0 -nolisten tcp -background none -logfile /var/log/mydm/xorg.log vt1",shell=True)
return xorg
def start_user_session(username) :
loginctl = subprocess.run(f"loginctl enable-linger {username}",shell=True)# ,capture_output=True)
#print(loginctl)
if loginctl.returncode == 0 :
subprocess.run(f"sudo -u {username} dbus-launch startxfce4",shell=True)
if __name__ == "__main__" :
if start_x11().returncode == 0 :
app = QApplication(sys.argv)
app.setStyleSheet('''
QPushButton#loginDockButton {
border: none;
padding: 0px;
margin: 0px;
}
''')
window = LoginWindow()
window.show()
sys.exit(app.exec())
As you can see, i'm using subprocess.run() in order to run Xorg. And when asked to an AI to resolve the problem,i was recommended to run :
subprocess.run("loginctl enable-linger {username}",shell=True)
According to that AI, it let the users child processes to run even if logged out, this in order to prevent closing dbus process. (though still wonder how this can help 🤔)
Unit Service
[Unit]
Description=mydm
[email protected]
After=systemd-user-sessions.service plymouth-quit.service
Requires=systemd-logind.service
[Service]
ExecStart=/usr/bin/python3 /etc/mydm/src/mydm_login.py
Restart=always
RestartSec=3
StandardOutput=syslog
StandardError=syslog
TTYPath=/dev/tty1
TTYReset=yes
TTYVHangup=yes
TTYVTDisallocate=yes
[Install]
WantedBy=graphical.target
I have to admit that the unit service code, was all generated by an AI because i didn't have any idea how unit files work and neither systemd or systemctl
Logfile
After some minutes of sadness and grief from not seeing my GUI, i decided to look at into the logfile from Xorg and got the next :
[ 3671.154] Current Operating System: Linux MrDikxon 6.13.2-arch1-1 #1 SMP PREEMPT_DYNAMIC Sat, 08 Feb 2025 18:54:55 +0000 x86_64
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
grep EE /var/log/mydm/xorg.log
[ 3671.154] (EE) systemd-logind: failed to get session: PID 4060 does not belong to any known session
[ 3671.171] (EE) Failed to load module "fbdev" (module does not exist, 0)
[ 3671.172] (EE) Failed to load module "vesa" (module does not exist, 0)
[ 3671.186] (EE) open /dev/dri/card0: No such file or directory
[ 3671.191] (II) Initializing extension MIT-SCREEN-SAVER
[ 3671.193] (EE) AIGLX error: dlopen of /usr/lib/dri/i965_dri.so failed (/usr/lib/dri/i965_dri.so: cannot open shared object file: No such file or directory)
[ 3671.193] (EE) AIGLX error: unable to load driver i965
grep WW /var/log/mydm/xorg.log
[ 3671.154] (WW) The directory "/usr/share/fonts/misc" does not exist.
[ 3671.154] (WW) The directory "/usr/share/fonts/TTF" does not exist.
[ 3671.154] (WW) The directory "/usr/share/fonts/OTF" does not exist.
[ 3671.154] (WW) The directory "/usr/share/fonts/Type1" does not exist.
[ 3671.154] (WW) The directory "/usr/share/fonts/100dpi" does not exist.
[ 3671.154] (WW) The directory "/usr/share/fonts/75dpi" does not exist.
[ 3671.169] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
[ 3671.171] (WW) Warning, couldn't open module fbdev
[ 3671.172] (WW) Warning, couldn't open module vesa
[ 3671.186] (WW) Falling back to old probe method for modesetting
When doing it when (NI,??) didn't get any output.
this is my first time working with Xorg or sysmted, so i dont know really what can i do. So i havent tried anything yet, and unix & linux stackexchange threads doesn't seem to relate much to what i need
fbdevandvesa.fbdevisFrameBuffer