ELAN touchpads connected via i2c do not work correctly on a warm reboot from a system that does not fully support them into linux mainline. This is a somewhat esoteric bug, but it affects factory production lines where a machine first boots some kind of flashing tool / installer (which does not have proper support for this touchpad) and then reboots into the installed system to run a factory test procedure. To reproduce it one needs a modified kernel where the touchpad is driven by i2c_hid, so removing the ACPI HW id from drivers/input/mouse/elan_i2c_core.c and removing the USB_VENDOR_ID_ELAN entries from hid_ignore_list[] in drivers/hid/hid-core.c should be enough. Then doing a warm reboot from this modified kernel into mainline prevents the touchpad from working at all, and dmesg gets flooded with these messages: elan_i2c i2c-ELAN1000:00: invalid report id data (1) Any ideas are welcome, and I can provide more data / run tests if needed. This has been seen on the Asus E202SA, N552VW and X456UF. Thanks and regards, -- João Paulo Rechi Vita http://about.me/jprvita -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
