> Actually, I've noticed this problem on my dell e7440 after updating the bios > to A10. Unfortunately, I've not written the previous version I was using > before (probably A08). > 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 :/ Hello! Now this could be an evil and unsupported way, but try downgrading the bios to A09 or even A08 and test that. Also, now that this happens in a VM the issue could be raised to Dell support, as it should be a supported system. -- Oliver Temlin