I have a Wacom Bamboo tablet which has a touchpad function I almost never use—it mostly gets in the way. I have a script which switches that function off, run via a .desktop file in ~/.config/autostart. This works fine and I have no problem running the script from a terminal either.
The problem is that after resuming from suspend, the touch function reactivates. Prior to upgrading to 16.04, this script was called from /etc/pm/sleep.d/wacom which switched it off again. After upgrading I’ve tried doing the same thing using systemd (/lib/systemd/system-sleep/wacom), but there seems to be something very different about the context in which it’s run because the command produces puzzling errors.
Syslog shows wacom_set_report: ran out of retries (last error = -32) and error -32 seems to mean “communication pipe broken”.
Logging output shows that even getting the status fails—xsetwacom get "$DEVICE" touch* returns no output when it should report “on” or “off”. Running the command to switch off touch (xsetwacom set "$DEVICE" touch off) returns “Failed to open Display .”.
I also get this—warning: commands will be executed using /bin/sh but the script runs fine for me using sh.
I’ve tried adding a sleep command before calling the script but it doesn’t seem to help. I’ve called it using at (at now + 1 min -f), but the result is the same—even though it’s running well after resume the script still can’t even get the device status. I tried putting the status command into a while loop, but it never broke out of the loop (no status was returned), yet at the same time I could run the command successfully in a terminal.
I’ve also tried putting the command directly in /lib/systemd/system-sleep/wacom.
This is fairly trivial, but annoying that this used to work, but now doesn’t.
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*DEVICE="Wacom Bamboo 2FG 6x8 Finger touch" as returned by xsetwacom list dev.
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