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stockmind / dell-xps-9560-ubuntu-respin

Collection of scripts and tweaks to adapt Ubuntu and Linux Mint ISO images to let them run smooth on Dell XPS 15 9560.
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Touch screen power saving #14

Open luispabon opened 6 years ago

luispabon commented 6 years ago

Another power top tunable that could be set on boot:

echo 'auto' > '/sys/bus/usb/devices/1-9/power/control';
luispabon commented 6 years ago

/lib/systemd/system/touchscren-powersave.service

[Unit]
Description=Enable touch screen powersave

[Service]
Type=oneshot
ExecStart=/bin/sh -c "echo 'auto' > '/sys/bus/usb/devices/1-9/power/control';"

[Install]
WantedBy=default.target
sudo systemctl enable touchscren-powersave
luispabon commented 6 years ago

The reason I have these as services is because powertop autotune messes up with certain devices I have sometimes connected on boot. For instance my external keyboard or mouse become unresponsive on first interaction if they're idle for more than a few seconds, which is infuriating.

ryanshow commented 6 years ago

For some reason this script was working for me when invoking it manually, but not on boot. I think that there is some other process setting the autosuspend setting to "on" after the touchscreen-powersave service runs.

Regardless, I managed to make it work by changing the Type line to:

Type=idle

This delays the execution of the service to later in the boot to ensure that it won't be overridden by whatever was forcing autosuspend off.