Bug#820013: general: Touchpad not working on Lenovo IdeaPad Yoga 13 after updating from 8.3 to 8.4
On 5 April 2016 at 22:49, Ben Hutchings <ben@decadent.org.uk> wrote:
> Control: reassign -1 src:linux 3.16.7-ckt25-1
> Control: tag -1 moreinfo
>
> On Mon, 2016-04-04 at 22:11 +0300, Juho wrote:
>> Package: general
>> Severity: important
>>
>> After running "apt-get update && apt-get dist-upgrade" on 2016-04-03
>> touchpad of IdeaPad Yoga 13 stopped working. Both touch plate and
>> buttons are not working.
>> This laptop also has a touch screen and it is still working without
>> problems.
>> I'm not sure which package included this 8.4 update might be the faulty
>> one.
> [...]
>
> Most likely the kernel. However, I can't see any obviously relevant
> changes. What does this command show:
>
> ls -l /sys/class/input/mouse*/device/device/driver
I have such a Yoga, for me it's the older yoga-13, pre-highdpi pro version.
$ sudo modprobe -r psmouse
$ sudo modprobe psmouse
Makes it "work" again. I have no idea what happens during the boot, or
how come post-boot psmouse module loading results in working
behaviour.
Possibly something is racy in the kernel and initializes differently
"post-boot".
It broke around 3.13 following upstream kernels for me or some such.
And bisecting this using master/vanilla/.0 kernels ended up being
fruitless, at least for me.
So i'm reloading psmouse on my IdeaPad....
--
Regards,
Dimitri.
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