Marwan, your workaround did in fact fix the problem for me.

I'll add that when I tried your workaround (echo 0
>/proc/sys/kernel/nmi_watchdog), I REMOVED acpi_backlight=vendor (which
I already had) at the same time. I rebooted and both problems were
fixed: I could change the backlight using my keyboard AND changing the
backlight no longer caused the computer to freeze. I haven't tried
putting acpi_backlight=vendor back in my grub configuration to see if
that breaks anything.

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https://bugs.launchpad.net/bugs/1007765

Title:
  brightness adjusting crashes system

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