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

[Tim Gardner]

Stefan Bader wrote:
> 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
> 

Stefan - I tend to agree that its not an OMG bug, except we've been
given the mandate to pay special attention to some of these netbooks.
So, I think it will have to qualify for an SRU. ACK.

rtg
-- 
Tim Gardner tim.gardner at canonical.com