On Fri, 22 Jul 2022, Stefan Hansson wrote: > Hi! > > Somewhere between Linux 5.17.6 and 5.18.11 the Huion tablet I have stopped > working properly. In GNOME Control Center it is identified as Huion New 1060 > Plus, however that's a different tablet than the one I have. Mine is a Huion > Inspiroy H640, and it uses the hid_uclogic driver. > > With Linux 5.17.6, the tablet works as expected with all the buttons being > detected and the stylus being usable. With 5.18.11, the buttons work fine but > the stylus does not work correctly. The first time I approach the tablet with > the stylus it works properly, i.e., the cursor on my screen moves around and > follows the stylus around the tablet as expected. It continues working like > this until I remove the stylus from the tablet. After I remove it from the > tablet, the cursor never gets controlled by the stylus again. I can see that > the tablet detects the stylus (it has a small indicator light), but the cursor > doesn't move when I approach the tablet again. To clarify, with Linux 5.17.6, > the cursor moves around just fine when I remove and then put it back to the > tablet, just as you would expected. > > It may also be worth noting that it worked fine when I previously used it > around six months ago, although I'm not sure what version of Linux I was using > at that time (whatever Fedora shipped back then). I also tried reproducing it > with yesterday's linux-next and Linux 5.19.0-RC7, and the behaviour was the > same as 5.18.11. I am currently trying to bisect this, but it's not going very > fast as I currently only have access to a dual core laptop from 2014, so > building Linux takes a good while. Thanks for the report. CCing José who has been doing a lot of work in this area recently, maybe he has an immediate idea. If not, perhaps bisecting the hid-uclogic.c commits between the two kernels would be the quickest option. -- Jiri Kosina SUSE Labs
