I have an issue with this laptop, I have randomly freezes (2-3/week) since I bought it (begin of April) and even after doing the update or trying the kernel 3.5.0 .
When freezing, the system totally freeze, no possibility to access to others tty or to do anything else than pushing the power button.
There is already a bug opened on launchpad https://bugs.launchpad.net/dell-sputnik/+bug/1167624, but that could be also a hardware problem.
Any idea how to solve it ?
If your system is totally locked up like that, there's one recovery thing to try:
Hold down ALT+PrtScr and then tap each of these keys individually a few seconds apart:
R S E I N U B
You can look up what all this does (each letter progressively starts shutting things down) but the short answer is that it flushes your buffers to disk, attempts to kill processes cleanly, etc., and the 'B' at the end tries a reboot.
There's a mnemonic to remember: Raising Skinny Elephants Is Never Utterly Boring
Try with an externally attached USB keyboard. I've never gotten REISUB to work with the onboard KB, using either Fn+PrtScrn or Fn+SysRq