Comment 6 for bug 1488426

One more thing that it's worth mentioning.
My Dell laptop came with ubuntu 14.04 preinstalled.
I tried to install all the updates (around 600MB of packages), had some issues and decided to download and install the latest LTS image (14.04.3).
What I'm trying to say is that I only noticed this bug after I reinstalled Ubuntu so I'm not sure if it also affected the Dell preinstalled Ubuntu image which might have had some additional proprietary divers included.
At this point I'm unable to reinstall the Dell stock Ubuntu image because I didn't create a recovery disk.