Apr 04 20:20:32.259050 HTPC kernel: usbcore: registered new interface driver ftdi_sio
Apr 04 20:20:32.259086 HTPC kernel: usbserial: USB Serial support registered for FTDI USB Serial Device
Apr 04 20:20:32.259099 HTPC kernel: ftdi_sio 1-1.5.1:1.0: FTDI USB Serial Device converter detected
Apr 04 20:20:32.259255 HTPC kernel: usb 1-1.5.1: Detected FT232RL
Apr 04 20:20:32.262619 HTPC kernel: usb 1-1.5.1: FTDI USB Serial Device converter now attached to ttyUSB0
Apr 04 20:21:02.981781 HTPC systemd[1]: service.lcdd.service: Scheduled restart job, restart counter is at 4.
Apr 04 20:21:02.982293 HTPC systemd[1]: Stopped LCDProc.
Apr 04 20:21:02.984274 HTPC systemd[1]: Started LCDProc.
Apr 04 20:21:02.992908 HTPC sh[1066]: LCDd 0.5dev, LCDproc Protocol 0.4
...
Apr 04 20:21:02.995331 HTPC sh[1066]: irtrans: unable to init client socket
Apr 04 20:21:02.995331 HTPC sh[1066]: Driver [irtrans] init failed, return code -1
Apr 04 20:21:02.995331 HTPC sh[1066]: Could not load driver irtrans
Apr 04 20:21:02.995410 HTPC sh[1066]: There is no output driver
Apr 04 20:21:02.995410 HTPC sh[1066]: Critical error while initializing, abort.
Apr 04 20:21:02.995743 HTPC systemd[1]: service.lcdd.service: Main process exited, code=exited, status=1/FAILURE
Apr 04 20:21:02.995853 HTPC systemd[1]: service.lcdd.service: Failed with result 'exit-code'.
Apr 04 20:21:03.527916 HTPC systemd[1]: systemd-hostnamed.service: Succeeded.
Apr 04 20:21:08.231772 HTPC systemd[1]: service.lcdd.service: Scheduled restart job, restart counter is at 5.
Apr 04 20:21:08.232308 HTPC systemd[1]: Stopped LCDProc.
Apr 04 20:21:08.232358 HTPC systemd[1]: service.lcdd.service: Start request repeated too quickly.
Apr 04 20:21:08.232377 HTPC systemd[1]: service.lcdd.service: Failed with result 'exit-code'.
Apr 04 20:21:08.232817 HTPC systemd[1]: Failed to start LCDProc.
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Looking at the logs this is what I can see. Is the RT232RL your ir receiver?
What does lsusb -t and lsusb -v show? Where / have you configured the ttyUSB0?