I have an HP dv4-1275mx that I got a few months ago. I've been having major sound issues with Ubuntu. Basically it doesn't play sounds through the speakers, but rather through the headphone jack. I can plug in external speakers and I'll have sound that way, but I can't find a way to switch the sound to the internal speakers.
Another problem: video. With the previous version of Ubuntu, I couldn't play DVDs or any of my downloaded video files. This new version can play the downloaded video files...without sound (even with headphones). DVDs still can't play at all. Yes, I've downloaded the codecs and packages suggested from the Ubuntu help site. Does anyone have any suggestions?