i see that the kernel logs and the output of dmesg show this error:

[drm:intel_dsm_platform_mux_info] *ERROR* MUX INFO call failed

drm: registered panic notifier

intel hd 4000 my graphics. i have three pc with ubuntu 12.04. one is
working with intel hd 400 sandy bridge, 32 bit. no problem, no issue at
all. one is working with ati on 64 bit, and there are no problem. this
one, with intel hd 4000, and frequent freezes. Since it is the only one
wich use a uefi bios,  i wonder if the bug is related with the uefi
bios...

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https://bugs.launchpad.net/bugs/993187

Title:
  ubuntu 12.04 completely freezes frequently.

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