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Bug#693726: xserver-xorg-input-synaptics: synaptics crashes after wakeup



On Mon, Nov 19, 2012 at 13:41:00 -0500, Sajith T S wrote:

> Package: xserver-xorg-input-synaptics
> Version: 1.6.2-2
> Severity: important
> 
> To be sure, synaptics doesn't crash each time the laptop is back from
> suspend.  I'm not sure how to reliably reproduce this.  The symptom is
> an unresponsive touchpad -- mouse pointer is present, but can't move
> it using touchpad; and there are no response to button clicks.
> 
> I believe these messages from Xorg.0.log could be of interest:
> 
>   [ 62236.584] BUG: triggered 'if (priv->num_active_touches > priv->num_slots)'
>   [ 62236.584] BUG: ../../src/synaptics.c:3122 in UpdateTouchState()
>   [ 62236.584] 
>   [ 62236.584] Backtrace:
> 
>   [...]  
> 
> There are several of those, but I think it's the first crash that made
> the touchpad unresponsive.
> 
> This is a Thinkpad T420 running wheezy/sid.  Please let me know what
> other information I could provide.
> 
Try rebuilding the synaptics driver with debug info, and running X under
valgrind until you reproduce...

Cheers,
Julien

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