[JAUNTY SRU] lp#399787 UBUNTU: The kernel shoud set BTN_TOOL_DOUBLETAP and BTN_TOOL_TRIPLETAP only if the touchpad supports them

[Stefan Bader]

Alberto Milone wrote:
> SRU JUSTIFICATION
> 
> IMPACT: The kernel in Jaunty reports multi-tap events without checking whether 
> they are supported by the device. As a consequence, the X.org driver reports 
> that multi-taps are supported in any case. This prevents us from 
> distinguishing between (and therefore from fixing) problems affecting 
> touchpads which support multi-taps and the ones which don't.
> 
> Furthermore applications (under development for OEM) which rely on the ability 
> to detect such capability will fail.
> 
> We need this for the Dell Mini 10v and for other netbooks affected by the same 
> problem.
> 
> FIX: commit e42b6646a8298fe06a33a0f68dab661335f5db6e in Linus' branch 
> (available since 2.6.29) makes sure that BTN_TOOL_DOUBLETAP and 
> BTN_TOOL_TRIPLETAP are set only if the device actually supports them.
> 
> TEST: the quickest way to test this is to install Karmic's X.org Synaptics 
> driver in Jaunty, restart X, type "xinput list-props $YOUR_TOUCHPAD_NAME" and 
> check that "Synaptics Capabilities" reports 1, 1, 1, 0, 0 (the last two 
> integers refer to the availability of double-taps and triple-taps 
> respectively) on the Dell Mini 10v. Without the fix it reports 1, 1, 1, 1, 1.
> 
> 
> BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/399787
> 
> Regards,
> 
> 
The patch looks simple and reasonable. Though this is not a OMG class I would 
think it important enough to fix for the current release. ACK

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