Did so. Apport told me I am running mainline kernel, however, everything
described here was 100% same using stock 12.04 kernel.
** Tags added: apport-collected precise
** Description changed:
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.
+ Screenshots: the first one is from freeze during usage, without those cstate
limiting parameters. The second one is that "first of the day" hang.
+ ---
+ ApportVersion: 2.0.1-0ubuntu15.1
+ Architecture: amd64
+ DistroRelease: Ubuntu 12.04
+ InstallationMedia: Kubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64
(20120820.1)
+ MarkForUpload: True
+ Package: linux (not installed)
+ ProcEnviron:
+ LANGUAGE=
+ TERM=xterm
+ PATH=(custom, no user)
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
+ ProcVersionSignature: Ubuntu 3.8.0-0.3-generic 3.8.0-rc3
+ Tags: precise
+ Uname: Linux 3.8.0-0-generic x86_64
+ UnreportableReason: The running kernel is not an Ubuntu kernel
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1102460
Title:
Kernel panic on i7-3610qm Toshiba P875
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