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SubjectRe: PROBLEM: Kernel version 3.2.1 usb touchscreen device not recognised [UDEV? USBINPUT? HOOK]
Hi Lachlan,

Well, many eGalax devices are multitouch devices, and can not be
handled by the generic input hid layer without having strange issues.
We have a patch in 3.2 that auto detect such devices and release them
from the generic input stack.
Then, it's easier for people to handle the devices through
hid-multitouch as the recompilation of the kernel is not required
I also submitted a patch to catch multitouch devices in
hid-multitouch, but it has not been accepted as it would require
everybody to load hid-multitouch for every hid device.

To enable your device, do (as root)
# modprobe hid-multitouch
# echo 3 VID PID 104 >

- 3 is the bus, usb here
- VID: vendor ID (must be 0eef in your case)
- PID: product ID
- 104 is the number of the right class of multitouch device to use
(see MT_CLS_* definitions in hid-multitouch)
VID/PID can be retrieved from lsusb.

If it's working, then you should also give us your PID so that we can
add it in the source of hid-multitouch.


On Fri, Jan 20, 2012 at 21:13, Padfoot <> wrote:
> On 21/01/12 03:02, Greg KH wrote:
>> On Fri, Jan 20, 2012 at 07:13:54PM +1100, Padfoot wrote:
>>> Upgrade from kernel 3.1.9 to 3.2.1 eGalax usb touchscreen device is
>>> no longer recognised.
>>> Device is an Acer Iconia Tab w501 with inbuilt touchscreen. Screen
>>> is a pci device but is connected on boot as a usb input device.
>>> Issue appears to be with either UDEV or USBINPUT boot hook failing
>>> to recognise the device as can be seen in the dmesg.3.2.1
>>> attachment.
>>> Downgrading to kernel 3.1.9 corrects the issue.
>> Can you run 'git bisect' between 3.1.0 and 3.2.0 to find the problem
>> commit here?
>> Also, you might want to cc: the linux-input developers, they can help
>> you out much better than the general list can.
>> greg k-h
> Hi Greg,
> I am not a kernel dev, nor have I ever compiled a kernel, so I don't think I
> am able to help with a git bisect to locate the offending commit. I am just
> a regular user running pre-compiled packages on my Arch Linux distro. But,
> of course I am happy to assist wherever I can.
> Cheers.
> Lachlan
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