Public bug reported:
I installed Ubuntu 12.04 on my new Toshiba P875 laptop with i7-3610qm.
During regular use, have been getting radnom MCEs realted to intel_idle
usage. After googling around and finiding similar issues by others, I
disabled intel_idle usage and went to acpi_idle. Freezes were the same,
but the exception description was related to acpi_idle. Therefore I
disabled any idling by adding "intel_idle.max_cstate=0
processor.max_cstate=0" to grub booting command line.
With these settings, on first start of the day, I got always one freeze
again related to cpu idle states. After hard turn off by holding the
button and one more start, I boots always normally and runs normally
with no more freezes / MCEs at all.
So in simple words: when there were no idle-disabling states added to
grub for booting, there were random MCEs during usage, but no hang
during the first boot ; after adding the idle-disabling states to grub,
there is always one MCE hang during first boot of the day, but no
freezes during usage.
I did the full memtest, no errors. Kernels tried: 3.2.0, stock 12.04
kernel (3.5), also 3.7.1, now trying 3.8.0 from raring, seems also the
same.
Turbostat prooved that frequency scaling works normally with disabled
cstates, but "cat /sys/devices/system/cpu/cpuidle/current_driver" shows
correctly "none". I tried all the kernel ide options (mwait, safe_half,
poll) and it's all the same.
Screenshots: the first one is from freeze during usage, without those
cstate limiting parameters. The second one is that "first of the day"
hang.
** Affects: ubuntu
Importance: Undecided
Status: New
** Attachment added: "screenshot_P875-1.jpg"
https://bugs.launchpad.net/bugs/1102460/+attachment/3492356/+files/screenshot_P875-1.jpg
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https://bugs.launchpad.net/bugs/1102460
Title:
Kernel panic on i7-3610qm Toshiba P875
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