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Re: kern/46391: ums.c doesn't support digitizers or touchscreens
On Mon, 30 Apr 2012 14:05:00 +0000, nathanialsloss wrote:
> I have a laptop with a touchscreen that was supported by ums.c as a usb
mouse. After upgrading my bios it now reports as a digitizer and was no
longer supported by ums.c. And instead of reporting buttons it now
reports as tip, barrel and eraser switches.
> Note: The digitizer type is 0002 which was undefined but I think it
means digitizer. This patch is my own work and I submit it under the
According to http://www.freebsddiary.org/APC/usb_hid_usages.php, type
0002 is "Pen". This is also not expected by the uts(4) driver, but I
wonder if it wouldn't have made more sense to patch it instead of ums(4).
> I think it would also be possible to mach against digitizer touchscreens
type 0004. But I didn't add it as I don't have the hardware to test.
One more thing that I was very useful while I was debugging uts(4): it is
very likely that your touchscreen supports different "input modes", and
that your BIOS simply changed the default one. You can use usbhidctl to
list and modify these properties.
PS: I have a few questions:
- how do you handle calibration, and absolute coordinates?
- does it simply work directly out of the box?
- is your screen resolution always set to the maximum available?
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