Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965754AbaLKVfj (ORCPT ); Thu, 11 Dec 2014 16:35:39 -0500 Received: from us-mx2.synaptics.com ([192.147.44.131]:49847 "EHLO us-mx1.synaptics.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934300AbaLKVff (ORCPT ); Thu, 11 Dec 2014 16:35:35 -0500 X-PGP-Universal: processed; by securemail.synaptics.com on Thu, 11 Dec 2014 13:59:49 -0800 Message-ID: <548A0DCA.6010609@synaptics.com> Date: Thu, 11 Dec 2014 13:34:02 -0800 From: Andrew Duggan User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: Gabriele Mazzotta CC: Mika Westerberg , , , , Subject: Re: NULL pointer dereference in i2c-hid References: <31518562.V5Oyo0POsI@xps13> <2187886.1Q1zbE8252@xps13> <548A02BD.7030509@synaptics.com> <9990741.QypFgP8pco@xps13> In-Reply-To: <9990741.QypFgP8pco@xps13> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.4.10.98] X-Brightmail-Tracker: AAAAAQAAAWE= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/11/2014 01:17 PM, Gabriele Mazzotta wrote: > On Thursday 11 December 2014 12:46:53 Andrew Duggan wrote: >> On 12/11/2014 11:40 AM, Gabriele Mazzotta wrote: >>> On Thursday 11 December 2014 11:21:43 Andrew Duggan wrote: >>>> On 12/11/2014 11:11 AM, Gabriele Mazzotta wrote: >>>>> On Thursday 11 December 2014 10:40:05 Andrew Duggan wrote: >>>>>> On 12/11/2014 10:16 AM, Gabriele Mazzotta wrote: >>>>>>> On Thursday 11 December 2014 16:03:07 Mika Westerberg wrote: >>>>>>>> On Thu, Dec 11, 2014 at 10:58:01AM +0200, Mika Westerberg wrote: >>>>>>>>> On Wed, Dec 10, 2014 at 06:04:51PM +0100, Gabriele Mazzotta wrote: >>>>>>>>>> my laptop uses a touchpad that needs hid-rmi along with i2c-hid to work. >>>>>>>>>> i2c-hid and hid-rmi can be loaded and unloaded independelty from each >>>>>>>>>> other, however since 34f439e4afcd ("HID: i2c-hid: add runtime PM support") >>>>>>>>>> if I unload hid-rmi and after it I also unload i2c-hid, I get a NULL >>>>>>>>>> pointer dereference. >>>>>>>>> I'll look into this. >>>>>>>>> >>>>>>>>> I can reproduce this easily with i2c-hid + hid-multitouch following your >>>>>>>>> directions. >>>>>>>> Can you try the below patch? >>>>>>>> >>>>>>>> I think we shouldn't free buffers yet in ->stop() because we need the >>>>>>>> command buffer sending power commands to the device. Also it seems that >>>>>>>> ->start() re-allocates buffers anyway if maximum size increases. >>>>>>>> >>>>>>>> It shouldn't even leak memory as we release buffers at ->remove() >>>>>>>> anyway. >>>>>>>> >>>>>>>> diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c >>>>>>>> index 62cec01937ea..68a8c938feea 100644 >>>>>>>> --- a/drivers/hid/i2c-hid/i2c-hid.c >>>>>>>> +++ b/drivers/hid/i2c-hid/i2c-hid.c >>>>>>>> @@ -705,12 +705,7 @@ static int i2c_hid_start(struct hid_device *hid) >>>>>>>> >>>>>>>> static void i2c_hid_stop(struct hid_device *hid) >>>>>>>> { >>>>>>>> - struct i2c_client *client = hid->driver_data; >>>>>>>> - struct i2c_hid *ihid = i2c_get_clientdata(client); >>>>>>>> - >>>>>>>> hid->claimed = 0; >>>>>>>> - >>>>>>>> - i2c_hid_free_buffers(ihid); >>>>>>>> } >>>>>>>> >>>>>>>> static int i2c_hid_open(struct hid_device *hid) >>>>>>> Yes, it works, thanks. >>>>>>> >>>>>>> This change seems to also prevent kernel ooops when I unload either >>>>>>> i2c-hid or i2c-designware-platform while the touchpad is in use, >>>>>>> thing that is likely to happen because of the other bug I reported. >>>>>>> >>>>>>> Speaking of it, does any of you have any suggestion on how to debug it? >>>>>> I was able to reproduce the initial issue by unloading hid-rmi and >>>>>> i2c-hid while holding my fingers on the touchpad. Mika's patch fixes it >>>>>> for me. >>>>>> >>>>>> For the original bug, you can modprobe i2c-hid debug=1 and we can see >>>>>> what data the touchpad is reporting. That might help narrowing down if >>>>>> it's noise which the touchpad thinks are fingers or if there is a >>>>>> problem with the I2C lines causing spurious interrupts. >>>>>> >>>>>> Andrew >>>>> I've already tried to do that and here what I got: >>>>> >>>>> When I release the finger, the last message is repeated 81 times. >>>>> If the byte containing informations about the width of the finger >>>>> becomes equal to either c0 or 0c at least once, the last message is >>>>> repeated indefinitely and changes as soon as I start using the touchpad. >>>>> The only way to stop it is to unload and reload i2c-hid. >>>> The reports before log throttling kicks in would still be useful. For >>>> instance c0 is outside of the range of finger width which we report so >>>> something is wrong there. But, the touchpad should stop interrupting >>>> once the finger is lifted. The fact that subsequent reads are reporting >>>> the same data does sound like a problem with I2C getting confused and >>>> continuously interrupting and reading the old finger data. I am also >>>> curious about the value of the byte after the report id. >>>> >>>> Andrew >>> If I'm not wrong c0 means that the width is 12 on y axis, while 0c means >>> that the width is 12 on the x axis. >> You are correct! I forgot width was 4 bits for X and Y in the same byte. >> That makes more sense. >> >>> I have to correct myself. The important thing is that the byte is either >>> cx or xc, where x is anything below c. >>> >>> Another correction. Sometimes unloading i2c-hid is not enough, I have to >>> first disable the touchpad with xinput and then unload i2c-hid. If I >>> don't do it, the messages starts reappearing as soon as I reload i2c-hid. >>> >>> I did several tests in the past months and I'm quite sure that the bug >>> happens only past xc/cy. >> This maybe coincidental. It is not obvious to me why a certain width >> value would cause the symptoms described. > Yes, I don't deny it. This is just a constant I found in my tests. > >>> Here few lines right before the bug. The last line is repeated indefinitely: >>> >>> [ 1983.527097] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 67 5b 61 0a 5f 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.537211] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 67 5b 63 0a 60 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.547329] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 67 5b 64 0a 60 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.557486] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 67 5b 66 0a 60 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.567663] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 67 5b 68 0a 60 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.577719] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 67 5b 6a 0a 61 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.587852] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 67 5b 6b 0a 61 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.598001] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 67 5b 6e 0a 62 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.608215] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 68 5b 61 0a 62 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.618288] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 68 5b 64 0b 63 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.628493] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 68 5b 67 0b 63 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.638552] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 68 5b 69 0b 64 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.648663] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 68 5b 6c 0b 64 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.658789] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 68 5b 6f 0b 64 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.668923] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 69 5b 61 0b 65 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.678819] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 69 5b 64 0b 65 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.689230] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 69 5b 66 0b 65 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.699435] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 69 5b 68 0b 65 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.709502] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 69 5b 6a 0b 66 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.719574] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 69 5b 6c 0b 66 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.729713] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 69 5b 6e 0b 66 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.739863] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6a 5b 60 0b 66 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.750001] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6a 5b 62 0b 66 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.760150] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 6a 5b 64 0b 67 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.770291] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6a 5b 66 0b 67 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.780445] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6a 5b 68 0b 67 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.790490] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6a 5b 5a 0b 68 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.800667] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 6a 5b 4e 0c 69 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.810691] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6b 5b 31 0c 69 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.820963] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6b 5b 24 0c 6a 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.831071] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6b 5b 17 0c 6a 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.841178] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6b 5b 09 0c 6a 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.851325] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6b 5b 0b 0c 6b 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.861435] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6b 5b 0d 0c 6b 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.871566] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 6b 5b 0f 0c 6b 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.881735] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6c 5b 01 0c 6b 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.891975] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6c 5b 03 0c 6b 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.902073] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6c 5b 05 0c 6c 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.912155] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6c 5b 07 0c 6b 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.922224] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6c 5b 09 0c 6c 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.932364] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6c 5b 0b 0c 6c 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.942480] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6c 5b 0d 0c 6c 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.952612] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 6c 5b 0f 0c 6c 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.962774] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6d 5a f1 0d 6d 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.972932] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6d 5a f3 0d 6e 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.982872] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6d 5a f6 0d 6f 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1983.993194] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 6d 5a f9 0d 6f 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.003295] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6d 5a fc 0d 6f 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.013511] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6d 5a ff 0d 70 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.023590] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6e 5a f2 0d 70 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.033747] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 6e 5a f5 0e 71 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.043850] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6e 5a f8 0e 71 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.053873] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6e 5a fb 0e 71 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.064077] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6e 5a fe 0e 72 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.074207] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6f 5a f1 0e 72 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.084425] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 6f 5a f3 0e 72 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.094533] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6f 5a f6 0e 73 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.104629] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6f 5a f8 0e 73 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.114742] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6f 5a fa 0e 73 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.124890] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6f 5a fc 0e 73 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.135006] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 6f 5a fe 0e 73 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.145149] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 70 5a f0 0e 73 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.155317] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 70 5a e2 0e 73 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.165380] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 70 5a d4 0d 74 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.175532] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 70 5a d6 0d 74 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.185409] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 70 5a d8 0d 75 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.195761] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 70 5a db 0d 75 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.205909] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 70 5a dd 0d 75 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.216034] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 71 5a d0 0e 76 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.226198] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 71 5a d3 0e 77 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.236301] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 71 5a d6 0e 77 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.246520] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 71 5a cb 0f 79 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.256573] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 01 00 72 5a b1 0e 78 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.266697] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 72 5a a7 0e 77 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.276823] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 72 5a 6d 0d 72 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.286921] i2c_hid i2c-DLL060A:00: input: 20 00 0c 0c 01 00 73 59 96 0a 5a 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.296888] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 00 00 73 59 96 00 00 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.306825] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 00 00 73 59 96 00 00 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >>> [ 1984.316980] i2c_hid i2c-DLL060A:00: input: 20 00 0c 04 00 00 73 59 96 00 00 03 09 40 00 00 90 86 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 >> The last report which repeats indicates that no fingers are present. >> But, the click button is generating the interrupt and it is reporting >> that it is in the down position. Could the click button be getting stuck >> down? That would also explain why the data in the report is not >> changing. Could you be bumping the touchpad with your palm which is >> causing the click button to get stuck in the down position? That might >> also explain the large width value. Our max width is 15, so 12 would >> typically indicate a contact larger then a normal finger contact. That >> would explain the width of 12 showing up when this happens. > Yes, that's not a normal finger touch and the reported width seems > quite accurate to me. There are no clicks involved, laying the side of > my thumb gently on the top part of the clickpad (from where even voluntary > clicks are hard to obtain) is enough to trigger the bug. If a click is > reported, than something is really wrong. Do the reports look the same? With the repeated reports starting with "20 00 0c 04"? >> Andrew -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/