https://bugzilla.kernel.org/show_bug.cgi?id=222065
URL: https://github.com/Pawls/acer-e5-575g-touchpad-fix
Bug ID: 222065
Summary: i2c-hid: ELAN0501 touchpad on Acer Aspire E5-575G
stalls; firmware declares its IRQ edge-triggered
Product: ACPI
Version: 2.5
Kernel Version: 7.0.0-34-generic (Ubuntu/Mint build)
Hardware: Intel
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: Config-Interrupts
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 310932
--> https://bugzilla.kernel.org/attachment.cgi?id=310932&action=edit
dmesg, E5-575G BIOS V1.47, touchpad in Advanced mode, stock DSDT (no override),
kernel 7.0.0-34
Hardware: Acer Aspire E5-575G, BIOS V1.47 (DMI: Acer / Aspire E5-575G / V1.47),
touchpad ELAN0501:00 04F3:3019 on i2c_designware.0.
Kernel: 7.0.0-34-generic (Ubuntu/Mint build).
With the BIOS touchpad option set to "Advanced", the DSDT exposes
\_SB.PCI0.I2C0.TPDE (ELAN0501) with:
Interrupt (ResourceConsumer, Edge, ActiveLow, Exclusive, ,, ) { 0x52 }
(TPD1 / SYNA7DB5 has the same descriptor.) i2c-hid honours the edge trigger
from ACPI, the touchpad asserts its level-low interrupt, and after a missed
edge the line stays asserted and no more interrupts arrive. /proc/interrupts
shows "82-edge" with the count stuck; dmesg shows "i2c_hid_get_input: IRQ
triggered but there's no data". Rebinding the driver partially revives it.
Overriding the DSDT to declare the interrupt Level/ActiveLow (only change: flag
byte 0x07 -> 0x05 in both descriptors) makes the touchpad work fully: IRQ 82
becomes fasteoi and delivers interrupts normally. Windows works with the stock
table.
Suggested fix: a DMI quirk forcing IRQF_TRIGGER_LOW for this device in
i2c-hid-acpi, or an ACPI IRQ trigger override for this system. Override
scripts: https://github.com/Pawls/acer-e5-575g-touchpad-fix
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