Hi Dmitry! I'm observing a problem with internal touchpad (handled by psmouse.ko) on Dell laptops connected to Dell E docking station. When I connect external PS/2 keyboard to docking station then internal laptop touchpad switch from multitouch absolute mode to relative bare PS/2 mode. And because ALPS driver in psmouse.ko is capable to process interleaved bare 3-byte PS/2 packets with 6-byte ALPS packets (which handles trackstick data on some ALPS models), ALPS driver does not show any message about this "downgrade" from multitouch to bare mode. And continue working in bare mode. When I rmmod psmouse and modprobe it again, then touchpad switch back to multitouch mode. Mario told me that Dell Embedded Controller, which handle internal keyboard, internal touchpad and external PS/2 keyboard, automatically send RESET command to *all* those devices when external PS/2 keyboard is connected. Therefore this is reason why touchpad downgrade to to bare mode. And according to Mario, host system should issue vendor specific PS/2 commands to re-initialize all PS/2 devices when this situation happen. Mario also told me that Windows is doing this action. Every time when I connect external PS/2 keyboard to dock I see this message in dmesg: Spurious ACK... Some program might be trying to access hardware directly. I see it also every time when I dock laptop into docking station (to which is keyboard already connected). And it happens also when I connect external PS/2 mouse to dock. Dmitry, how to handle this situation to re-initialize psmouse.ko when external PS/2 device is connected to Dell E docking station? According to Mario, this is how Dell Embedded Controller is designed and suppose how OS should work with it. Manually rmmoding and modprobing for every docking/undocking laptop is not ideal solution. Could it be possible to use that Spurious ATKBD_RET_ACK from atkbd.c be handled on Dell systems (probably via DMI) as an event to reset and reinitialize all PS/2 devices? -- Pali Rohár pali.rohar@xxxxxxxxx -- 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
