Pure Data able to start via the Button only when connected by SSH

_dspk · April 18, 2018, 12:47pm

hi,
weird situation here… when i’m connected to my Pi over SSH I cna press the button and it launches the file ‘main’ from puredata-patches.
BUT
if i’m not connected via SSH nothing happens… if i then log in and run top i can see that pd is not running? but then pressing the button starts everything as expected.
any thoughts?

thanks

Giedrius · April 18, 2018, 2:09pm

We resolved this issue via the chat on the website - right now we worked around by specifying the ‘-nogui’ instead of $NO_GUI on this line:

github.com

BlokasLabs/pisound/blob/master/scripts/common/start_puredata.sh#L72


				aconnect "Pure Data:1" $p:$i 2> /dev/null;
			done;
		done
	) &


	PATCH="$1"
	PATCH_DIR=$(dirname "$PATCH")
	shift


	log "Launching Pure Data."
	cd "$PATCH_DIR" && puredata -stderr -alsa -audioadddev pisound -alsamidi -channels 2 -r 48000 $NO_GUI -mididev 1 -send ";pd dsp 1" "$PATCH" $@ &
	PD_PID=$!


	log "Pure Data started!"
	flash_leds 1
	sleep 0.3
	flash_leds 1
	sleep 0.3
	flash_leds 1


	wait_process $PD_PID

We’ll investigate this on our side, but so far I was unable to reproduce the issue on my own system.

Let us know if anyone else hits the same issue!

thetechnobear · April 18, 2018, 5:46pm

I suspect you need to export NO_GUI

Giedrius · April 18, 2018, 6:02pm

I suspect the cause of the issue was the automatic detection of a display to use (like using HDMI one if connected, otherwise try to locate any remote desktop displays, otherwise fall back to -nogui), if anyone knows better methods, let us know.

github.com

BlokasLabs/pisound/blob/master/scripts/common/common.sh#L93


		echo 1 argument must be specified! 1>&2
		return
	fi
	while true; do
		wait $1
		kill -0 $1 2> /dev/null || break
	done
}


# Find first X display.
find_display() {
	# If HDMI display is connected, try default :0 manually.
	if [ "$(tvservice -n 2>&1)" != "[E] No device present" ] && XAUTHORITY=/home/pi/.Xauthority DISPLAY=:0 xhost > /dev/null 2>&1; then
		echo :0
		return 0
	fi


	# HDMI display was unavailable, try finding another display (such as vnc) to use.
	display=$(ps ea | grep -Po "DISPLAY=[\.0-9A-Za-z:]* " | sort -u | head -n 1 | grep -oe :.*)
	if [ -z $display ]; then
		if [ -z $PISOUND_DISPLAY ]; then

_dspk · April 18, 2018, 6:25pm

For info (not sure if it’s useful or not, depends if any changes were made to pisound download package )
I installed my first pisound on 20th March and managed to get button working with device running standalone off a battery. That time I installed puredata from terminal window. Then managed to snap the sdcard (long story!) so reinstalled OS from same raspberry stretch disc image as before, re-downloaded pisound this Monday (16th April), and this time downloaded puredata using the option in pisound-configuration. At that point the button would only launch pd when I was logged in over SSH (via X quartz on mac osx)… Until giedrius jumped on the case and helped fix it of course!!!