Erratic mouse behavior in 12.04

Marcelo Magno T. Sales mmtsales at
Wed May 30 17:40:50 UTC 2012

Em quarta-feira, 30 de maio de 2012, às 17:21:35, Basil Chupin escreveu:
> On 28/05/12 22:09, Marcelo Magno T. Sales wrote:
> > 2012/5/27 Basil Chupin <blchupin at>:
> >> On 28/05/12 03:51, Marcelo Magno T. Sales wrote:
> >>> Hello,
> >>> 
> >>> I'm running Kubuntu 12.04 64 bits fully updated and I'm experiencing
> >>> some
> >>> strange mouse behaviors, completely reproducible in this machine (Dell
> >>> Inspiron One 2320). I have three others (vaio notebook and two Dell
> >>> notebooks)
> >> 
> >>> where this problem does not happen. Some examples:
> >> Sounds like it may be your video card driver. Are you using nVidia, for
> >> example, but have not installed the "proper" driver[***] - that is, still
> >> using the default nouveau driver?
> >> 
> >> [***] The latest nVidia driver is 295.53.
> >> 
> >> [.............]
> > 
> > This system uses hybrid graphics (nvidia optimus), but I'm currently
> > running Intel graphics only. I've seen some solutions around the net
> > to activate and use the nvidia GPU, but haven't tried any of them yet.
> > So far, Intel graphics is doing good for what I need, so activating
> > the nvidia GPU is not a priority right now.
> > After my first post, I've noticed that all those pointer problems go
> > away if I disable the system's touchscreen device. Therefore, it seems
> > that the mouse and the touchscreen are fighting each other. Now I'm
> > trying to get rid of the problems while keeping a working touchscreen.
> > 
> > Thanks,
> > 
> > Marcelo
> Good luck then in your quest for the solution.
> But one of the things which *I* would have done is to install the proper
> nVidia driver which would then at least eliminate one possible cause of
> the problem; if this did not solve the problem then you can go on and
> keep looking for the cause knowing that it is not the nVidia driver.
> But then, you know best.

It's not that I'm ignoring your suggestion, it's just that it's not so simple 
to test it. Right now, Xorg can't even see the nvidia GPU. It is "disabled", 
so to speak (not exactly, is on and consuming power, but it's invisible for 
the system). Only the Intel GPU is visible and this is the driver X loaded, 
not nouveau. The proper nvidia driver does not find the nvidia GPU neither.
I've seen two solutions for activating the nvidia GPU in a system with nvidia 
optimus technology:

All those transformers :) seem great, but it takes some time to make them 
work. This is not a priority for me at the moment and, since the nvidia GPU is 
invisible for the system and the loaded driver is the Intel one, it doesn't 
seem like the problems are caused by the video driver, specially if they all 
go alway when the touchscreen is off.
But eventually I'll make the nvidia GPU work...



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