I have an HP Pavilion x360 n010dx running Ubuntu 14.10 Utopic Unicorn with the Linux kernel "linux-signed-image-3.16.0-23-generic", and I am having issues with Ubuntu starting up as well as with Ubuntu turning itself off.
The first time I turn the computer on from its completely shut off state, and after I input my disk encryption password, the computer will hang at the crypt_swap being successfully set up message. I then have to hold down the power button to force the computer to turn off. However, when I try to start up the computer again, it will get past the crypt_swap message, check the disk for errors and start up perfectly fine. It seems to work every other time.
When it comes to turning the computer off, Ubuntu itself can't seem to make the computer do so. When I tell the computer to shut down through Ubuntu, it will transition to the purple Ubuntu splash screen and freeze there after a couple of seconds. The only way for me to actually turn the computer off is to once again hold down the power button.
I read on another forum (I can't find the link right now...) that it could be a module called "hp_accel" that is causing the startup problem. I believe this may be it, because I started Ubuntu through Recovery Mode in GRUB, and the last message to appear had something to do with hp_accel reverting to default configuration since it couldn't identify my laptop before the startup process froze up as usual. Concerning the shutdown issue, I have no idea what could be causing that.
So, what can I do to fix these issues, if anything? Should I provide some sort of log to help diagnose the problem? If so, what log would I want to get and how do I get it (never dealt with logs and log-fetching before so I have no idea what to do when it comes to that)?
SIDE NOTE: I know that the latest Linux kernel image I can get through the Ubuntu Software Update program is 3.16.0-29, but with that image, my computer would freeze on startup 100% of the time. So, I reverted back to the -23 image because I could at least get it to start some of the time.