Bug: Short reset of ps/2 mouse causes Synaptics touchpad misdetection

Bug: Short reset of ps/2 mouse causes Synaptics touchpad misdetection

[Alexander Lam]

Hi,

Please CC: me when replying

I have filed a bug on the kernel bug tracker, #15636,
https://bugzilla.kernel.org/show_bug.cgi?id=15636.

Description:
The commit
     commit 4a299bf591bc5bef3bde8316e603b9eaec5a7696
     author:    Dmitry Torokhov <dmitry.torokhov@gmail.com>
     date:    Fri, 25 Dec 2009 05:40:24 +0000 (21:40 -0800)
     Input: speed up suspend/shutdown for PS/2 mice and keyboards

     Instead of doing full-blown reset while suspending or shutting down
     the box use lighter form of reset that should take less time.

(I didn't do a full bisection, but I reversed this just this commit on a hunch,
and it made my problems go away)

Causes ~50% misdetection rate of the Synaptics touchpad upon reboot on an Acer
Aspire One AOA150.

Sometimes, the touchpad is detected as a plain mouse, and sometimes it is
detected as a Synaptics device.

Relevant dmesg sections:
Good Boot:
Mar  6 12:29:30 lamtop kernel: [    3.201052] Synaptics Touchpad, model: 1, fw:
7.2, id: 0x1c0b1, caps: 0xd04771/0xa40000
Mar  6 12:29:30 lamtop kernel: [    3.263016] input: SynPS/2 Synaptics TouchPad
as /devices/platform/i8042/serio2/input/input6


Bad Boot:
Feb 12 08:16:12 lamtop kernel: [    4.060365] input: PS/2 Generic Mouse as
/devices/platform/i8042/serio2/input/input6


I am posting this to the list because there hasn't been any movement on this
bug since last week when it was filed. It also appears that the server
hosting the mailing list that the kernel input bugs are assigned to is down
(no ping, no nmap results to email ports)

--
Alexander Lam

Re: Bug: Short reset of ps/2 mouse causes Synaptics touchpad misdetection

[Christoph Fritz]

> 
> Bug: Short reset of ps/2 mouse causes Synaptics touchpad misdetection
> 

commit 4a299bf591bc5bef3bde8316e603b9eaec5a7696
commit 9230ccb1071d2d7e4ecb6314e67203b9f7f08140
commit 3e6e15a862a0bc20128497bbdc54254cdec21835

does it work with all these applied?

Re: Bug: Short reset of ps/2 mouse causes Synaptics touchpad misdetection

[Alexander Lam]

On Sun, Apr 4, 2010 at 1:35 PM, Christoph Fritz
<chf.fritz@googlemail.com> wrote:
>>
>> Bug: Short reset of ps/2 mouse causes Synaptics touchpad misdetection
>>
>
> commit 4a299bf591bc5bef3bde8316e603b9eaec5a7696
> commit 9230ccb1071d2d7e4ecb6314e67203b9f7f08140
> commit 3e6e15a862a0bc20128497bbdc54254cdec21835
>
> does it work with all these applied?
>
>
>
>
>

I've been trying to reproduce the bug with a stock unpatched kernel,
then testing with
those commits to compare, but I've been unable to reproduce the
original behavior.

This laptop is very wierd. Sometimes complete removal of power makes
stuff like this
go away, so I guess it was transient.

In other news, I also have been running 2.6.34-rc3 and I haven't seen
any of these issues,
so I guess you could consider this issue solved.

I'll close the bug.


Thanks,
Alexander Lam