30 lines
1.3 KiB
Bash
30 lines
1.3 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 resume to fully reinitialize haptic engine
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sudo tee /usr/lib/systemd/system-sleep/dell-xps-haptic-touchpad << 'HOOK'
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#!/bin/bash
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if [[ $1 == "post" ]]; then
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if [[ -d /sys/bus/i2c/devices/i2c-VEN_06CB:00 ]]; then
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echo "i2c-VEN_06CB:00" > /sys/bus/i2c/drivers/i2c_hid_acpi/unbind 2>/dev/null
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sleep 1
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echo "i2c-VEN_06CB:00" > /sys/bus/i2c/drivers/i2c_hid_acpi/bind 2>/dev/null
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fi
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fi
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HOOK
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sudo chmod +x /usr/lib/systemd/system-sleep/dell-xps-haptic-touchpad
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fi
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