On Fri, Jun 24, 2022 at 12:24:09AM +0200, Stefan Berzl wrote: > On 23/06/2022 19:51, José Expósito wrote: > > At the moment, there are only HID descriptors for the frame and the pen > > so, if your tablet is creating a touch ring device, something is not > > working as expected. > > > > Running "sudo libinput record" should display only the frame and the > > pen. Does it show something different in your case? > > > > $ sudo libinput record > > [...] > > /dev/input/event21: Hanvon Ugee Technology Co.,Ltd Deco L > > /dev/input/event22: Hanvon Ugee Technology Co.,Ltd Deco L Pad > > This is certainly true for the newer xppen devices we are working on. > However, while waiting for the xppen stuff to gain support, I bought a > tablet that's already supported, the Gaomon S620. Executing libinput > record or any other command that lists the devices, like evemu-describe, > gives: > > /dev/input/event15: GAOMON Gaomon Tablet > /dev/input/event16: GAOMON Gaomon Tablet Pad > /dev/input/event17: GAOMON Gaomon Tablet Touch Strip > /dev/input/event18: GAOMON Gaomon Tablet Dial Ah OK, I though you were talking about the XP-PEN device. I don't know why those extra event nodes are created, sorry. > >> There is however one caveat that seems to be unique to the mini7, which > >> is the ack packet that is sent when switching to the vendor defined > >> usage. It doesn't do much though, as currently it gets interpreted as a > >> pen report and since it doesn't have useful values, causes the cursor to > >> go to the top left screen position. Since the ack packet is only sent > >> once, it ought to be of little consequence. > >> > >> I would of course fix this, but I don't really know what's the preferred > >> way. One can obviously simply set up an urb to catch this, but it would > >> have to be a special corner case for the mini 7, as José assures me that > >> none of his tablets display similar behavior. Is this acceptable? > > > > My tablets also send an ACK packet, but in my case it does not have any > > visible effects. Maybe it is related to the DE environment used. I > > tested it on elementary OS (Ubuntu) and Fedora 36, in both cases the > > ACK is ignored... But catching it is fine, we can include the code you > > suggest. > > Can the contents maybe differ? > > This is the ack the mini 7 gives me: > 02 b1 04 00 00 00 00 00 00 00 00 00 > > While this is a button: > 02 f0 00 00 00 00 00 00 00 00 00 00 > > And here we have pen movement: > 02 a1 59 23 ef 32 b8 0e 00 00 00 00 Yes, the contents are different. My ACK does not contain the last 2 bytes. As mentioned in my previous email, I think that because the ACK of your tablet matches the size of a pen report and starts with 02 it is handled as a pen report. Jose
