Re: PROBLEM: Kernel version 3.2.1 usb touchscreen device not recognised[UDEV? USBINPUT? HOOK]

[Padfoot]

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<padfoot@xxxxxxxxxxxxxx>  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:
http://home.eeti.com.tw/web20/eGalaxTouchDriver/linuxDriver.htm

Cheers.
Lachlan.

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