33 lines
1.5 KiB
Bash
33 lines
1.5 KiB
Bash
# Fix Dell XPS haptic touchpad losing haptic feedback after suspend/resume.
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# The I2C controller's runtime power management aggressively suspends the touchpad,
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# and on resume the haptic engine sometimes fails to reinitialize.
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# This udev rule keeps the I2C controller always on to prevent that.
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# Applies to any Dell XPS with the Synaptics haptic touchpad (06CB:D01A).
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if cat /sys/class/dmi/id/product_name 2>/dev/null | grep -qi "XPS" \
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&& ls /sys/bus/i2c/devices/i2c-VEN_06CB:00 2>/dev/null; then
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# Disable runtime PM for I2C controller so haptic state isn't lost
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sudo tee /etc/udev/rules.d/99-dell-xps-haptic-touchpad.rules << 'EOF'
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ACTION=="add", SUBSYSTEM=="pci", KERNEL=="0000:00:19.0", ATTR{power/control}="on"
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ACTION=="add", SUBSYSTEM=="platform", KERNEL=="i2c_designware.0", ATTR{power/control}="on"
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EOF
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sudo udevadm control --reload-rules
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# Rebind the I2C HID touchpad on boot and resume to reinitialize haptic engine
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sudo tee /etc/systemd/system/dell-xps-haptic-touchpad.service << 'SVC'
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[Unit]
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Description=Rebind Dell XPS haptic touchpad
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After=systemd-udev-settle.service
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[Service]
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Type=oneshot
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ExecStart=/bin/bash -c 'if [[ -d /sys/bus/i2c/devices/i2c-VEN_06CB:00 ]]; then echo "i2c-VEN_06CB:00" | tee /sys/bus/i2c/drivers/i2c_hid_acpi/unbind > /dev/null 2>&1; sleep 1; echo "i2c-VEN_06CB:00" | tee /sys/bus/i2c/drivers/i2c_hid_acpi/bind > /dev/null 2>&1; fi'
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[Install]
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WantedBy=multi-user.target suspend.target hibernate.target
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SVC
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sudo systemctl daemon-reload
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sudo systemctl enable dell-xps-haptic-touchpad.service
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fi
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