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    SubjectRe: PROBLEM: Kernel version 3.2.1 usb touchscreen device not recognised [UDEV? USBINPUT? HOOK]
    On 21/01/12 07:50, Benjamin Tissoires wrote:
    > 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
    > anymore.
    > 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>
    > /sys/module/hid_multitouch/drivers/hid\:hid-multitouch/new_id
    > where:
    > - 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.
    > Cheers,
    > Benjamin
    > 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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    Hi Benjamin,

    Thankyou very much. Your solution has worked brilliantly.

    The device parameters I had to pass to hid-multitouch are as follows:

    echo 3 0eef 7302 259 > /sys/mod........

    I also have to use the binary daemon driver from eGalax for the device
    to work:


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