Hello,

Thanks for Your answear. As I wrote, I start more using Windows last few days and in Windows 7 I installed virtualbox with Lubuntu 14.04. Today when I work on this Lubuntu in VM that issue happend again. In Windows it not happens any time. I have really no idea what could be a reason. It is also probably not problem with config because some time ago I was checking it on Ubuntu Live and that was also happend :/

Best regards
Slawek Kaplonski
sla...@kaplonski.pl

W dniu 2014-09-09 o 09:00, Simon Hanna pisze:
On Sun, Sep 7, 2014 at 12:19 PM, Sławek Kapłoński <sla...@kaplonski.pl>
wrote:

So I'm almost sure that problem is somewhere in linux keyboard driver and
how it works with keyboard in this laptop model but I have no idea how to
fix this problem or how to get any details about it :/

It's not the cleanest approach, but if you cant find any other solution:
Back everything up and restore the config files to default states.

A quick google for your notebook showed that it IS working using archlinux
[1]
[1] references a french site with some configurations for your notebook.
You might wanna check this out too. [2]

In fact your notebook is even certified for ubuntu [3]

So it really looks like some config files are messed up...
(Or since it's arch, newer packages break things. You might wanna try
ubuntu from a usb drive just to be sure...)

[1] https://wiki.archlinux.org/index.php/Dell_Latitude_E7440
[2]
http://williamhollacsek.com/blog/2013/09/12/dell-latitude-e7440-optimisation
[3] http://www.ubuntu.com/certification/hardware/201304-13408/

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