[Interest] Slow pointer follow in Qt 5.2.2 (git) on freescale i.MX6 with tslib

[Jacob Kroon]

On Thu, Mar 6, 2014 at 10:20 AM, Stefano Cordibella <
stefano.cordibella at edalab.it> wrote:

>  Thank you Jacob for your suggestion,
>     for this application the choice of using eglfs is not under my direct
> control, in addition to this I suppose that the use of X11 can degrade the
> performance of the application (the target is a imx6 Single...).
>
> Did you noticed a decrease in performance moving from eglfs to X11?
> Which imx6 did you used? Single Dual or Quad?
>
>
It's just been some very rude basic testing, running a custom QML
application on Wandboard Solo and Wandboard Quad.
I can't say I've seen any particular overhead in performance in comparing
X11/eglfs, but eglfs should in theory use less resources as I see it.
As a humble Qt5 user I'm simply suspecting that the eglfs backend has seen
less use, and is not as mature as the X11 backend yet.



> Stefano.
>
>
> On 03/06/2014 10:05 AM, Jacob Kroon wrote:
>
>  Hi Stefano,
>
> On Thu, Mar 6, 2014 at 9:22 AM, Stefano Cordibella <
> stefano.cordibella at edalab.it> wrote:
>
>>  Hi Jacob,
>>     right, I did not specify that I use eglfs.
>>
>>
>  I can just talk from my own personal experience in using Qt5+iMX6. In
> 5.1.1, eglfs had a hard time tracking the mouse pointer, 5.2.0 improved
> things a lot. But best experience sofar has been in using the X11 backend
> instead of eglfs.
>
>   Stefano.
>>
>>
>> On 03/06/2014 08:53 AM, Jacob Kroon wrote:
>>
>>  Hi Stefano,
>>
>> On Thu, Mar 6, 2014 at 8:47 AM, Stefano Cordibella <
>> stefano.cordibella at edalab.it> wrote:
>>
>>>  Hi list,
>>>     using qt 5.2.2 (release branch from git, but I noticed the same
>>> issue with 5.2.1) on I.MX6 it is impossible to flick on qml elements,
>>> because the pointer does not "follow" the finger on touchscreen...
>>>
>>> The strange issue is that with non-qml application (fingerpaint example)
>>> or using tslib test application (ts_test) on device the cursor follow the
>>> finger at higher speed.
>>> Is this a libqtslibplugin.so or a qml issue?
>>> I generated the plugin without any option, only qmake, make and make
>>> install...
>>>
>>> I am using tslib library because my touchscreen does not support evdev
>>> (it is resistive?); I mean, trying to use EvdevTouch does not work at all,
>>> using EvdevMouse I see the pointer moving on screen, but the click doesn't
>>> work...
>>>
>>> Any suggestion will be appreciated...
>>>
>>>
>> Which qpa backend are you using, xcb, wayland or eglfs ?
>>
>>
>>
>>   --
>> *Stefano Cordibella*
>> EDALab s.r.l. - Networked Embedded Systems
>>
>> Strada Le Grazie, 15 - 37134 Verona - Italy
>> email : stefano.cordibella at edalab.it
>> skype : stefano.cordibella
>> tel. : +39 045 802 70 85 <%2B39%20045%20802%2070%2085>
>> web : www.edalab.it
>>
>
>
>
> --
>   -- Jacob
>
>
>
> --
> *Stefano Cordibella*
> EDALab s.r.l. - Networked Embedded Systems
>
> Strada Le Grazie, 15 - 37134 Verona - Italy
> email : stefano.cordibella at edalab.it
> skype : stefano.cordibella
> tel. : +39 045 802 70 85
> web : www.edalab.it
>



-- 
  -- Jacob
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