Messages in this thread | | | Date | Tue, 26 Jul 2022 13:58:24 -0400 | Subject | Re: PROBLEM: Regression likely in hid_uclogic driver breaks Huion Inspiroy H640 drawing tablet | From | Stefan Hansson <> |
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Hi again!
On 2022-07-25 18:48, José Expósito wrote: > Hi everyone, > > On Sun, Jul 24, 2022 at 01:48:49PM +0200, José Expósito wrote: >> 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 a lot for reporting the issue. >> >> HUION and other non-Wacom tablets are handled by the UCLogic driver. >> This driver is present in the kernel but its changes were deployed >> and tested first in the DIGImend driver: >> https://github.com/DIGImend/digimend-kernel-drivers >> >> A while ago, I started including in the kernel the code present in >> DIGImend. At this moment, 5.19.0-RC7 and DIGImend have the same code >> (well, 5.19 has more features, but they don't affect your tablet). >> >> I'm telling you this because it might be easier for you to bisect the >> changes in the DIGImend driver as it builds way faster than the kernel. >> Let me know if you need help bisecting it and I'll do my best to help >> you. >> >> Is this your device? >> https://www.huion.com/pen_tablet/Inspiroy/H640P.html
Yes :)
>> It is affordable, so I ordered it. I don't have any HUION devices to >> debug and this is a good excuse to buy one ;) >> I'll let you know how it goes once I receive it. > > The tablet arrived today and it is a bank holiday in Spain, so I had > some time to bisect the bug. > > The first bad commit is 87562fcd1342 ("HID: input: remove the need for > HID_QUIRK_INVERT"): > https://lore.kernel.org/all/20220203143226.4023622-11-benjamin.tissoires@redhat.com/ > (CCing the folks whose email is in the patch tags) > > I reverted the patch on hid/for-next and, after fixing a tiny conflict, > I can confirm that the tablet works again as expected.
Thanks for looking into this! Bisecting has been slow on my end unfortunately. I built today's linux-next (20220726) with your proposed patch below and my drawing tablet curiously still does not work as expected. The stylus works a couple of times, but eventually stops working (unlike prior where it always seemed to only work once). Do I need both your revert and this diff for it to work properly?
Also, do you know whether the revert be backported to stable 5.18?
> I'd need to investigate a bit more over the weekend, but I think that > all HUION tablets with the latest firmware (internally, v2) are > affected. > > Those tablets do not set the inrange bit (UCLOGIC_PARAMS_PEN_INRANGE_NONE). > The driver sets it and uses a timer to remove it. > See drivers/hid/hid-uclogic-core.c, function uclogic_raw_event_pen(). > > However, at least the Huion Inspiroy H640, sends a 0x00 byte when the > tool is removed, making it possible to fix it in the driver [1]. > > Unfortunately, the affected code path is used by many tablets and I > can not test them, so I'd prefer to hear Benjamin's opinion and see if > this should be fixed in hid-input rather than in the driver before > sending a fix. > > Best wishes, > José Expósito > > [1] Diff of a possible fix: > > diff --git a/drivers/hid/hid-uclogic-core.c b/drivers/hid/hid-uclogic-core.c > index 47a17375c7fc..bdcbbd57d0fc 100644 > --- a/drivers/hid/hid-uclogic-core.c > +++ b/drivers/hid/hid-uclogic-core.c > @@ -316,8 +316,11 @@ static int uclogic_raw_event_pen(struct uclogic_drvdata *drvdata, > } > /* If we need to emulate in-range detection */ > if (pen->inrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE) { > /* Set in-range bit */ > - data[1] |= 0x40; > + if (data[1]) > + data[1] |= 0x40; > + > /* (Re-)start in-range timeout */ > mod_timer(&drvdata->inrange_timer, > jiffies + msecs_to_jiffies(100)); Regards, Stefan Hansson
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