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Bug#689268: [wheezy] Intel HD 4000 (Ivy Bridge) graphics freeze



On 2012-10-17 05:21, Jonathan Nieder wrote:
Per Foreby wrote:

However my computer has been running without any problems for 11
days, so whatever caused this bug seems to be fixed in the 3.5.5
kernel.

Drat.  Ok.

To recap:

* Asus P8Z77-V LE.

* Newish system.  Works fine under load (e.g., Folding@Home) but
when you started normal interactive use it started to freeze a few
times a day while you were interacting with it (in particular, the
freeze happens around the same time as a keyboard or mouse action).

* The freeze is a bad one --- the fan spins down, the NIC stops
responding, caps lock doesn't light up, ctrl+alt+del and magic sysrq
have no effect.  No messages about it in netconsole.

* Happens reliably (how reliably?  >80% of the time?) after a few
hours of sustained use (?)

* Logs available in the bug log.  No obvious smoking guns. ;-)

* Changing the amount of memory allocated to the integrated GPU in
BIOS doesn't change anything.

* The above describes 3.2.23-1.  Based on a week and a half of
running 3.5.5-1~experimental.1 it doesn't seem to be affected.

Correct, apart from the timing. It's been from a few hours to five days
between the freezes. But with very little interactive use during the
five days.

I can add that stressing the graphics doesn't seem to trigger the
problem.

None of the changes from 3.2 to 3.5.5 are jumping out as likely
candidates for the fix, but that's a pretty wide range.

What about the MTRR patch that Ben Hutchings mentioned above (commit
9e984bc1dffd405138ff22356188b6a1677c64c8)? Or maybe that's just a
cosmetic change? According to https://bugs.freedesktop.org/show_bug.cgi?id=41648, this patch was added in 3.5-rc1.

How reliably can you reproduce the hang on a known-bad kernel? If you
have time to try 3.2.30-1 from sid, 3.4.4-1~experimental.1 from
http://snapshot.debian.org/package/linux/ and 3.3.6-1~experimental.1
from http://snapshot.debian.org/package/linux-2.6/ then that could
help narrow down the search.

With up to five days (so far) for a freeze to occur, it might take long to narrow down the change, and the computer in question is semi production (working from home), so the freezes are very annoying. But I'll give it a try in the name of the good cause.

Maybe I should start with running 3.5.5 for a few weeks, just to make sure that the freezes really are gone?

Jonathan Nieder wrote:

 * Asus P8Z77-V LE.

This makes as good a keyword for a web search as any.

It found [1] which is not too encouraging.  Maybe memtest86+ could be
worth a try to rule some problems out.

[1] http://thread.gmane.org/gmane.linux.debian.user.french/176707/focus=176710

Memory and cpu cooling were of course the first suspects. But I'm using a large Arctic heatpipe cooler and have never seen higher temperatures than +57.0°C on any core according to lm_sensors. And memtest86+ has been happy. I ran an extra pass today (about 2.5 hours) just to make sure, and everything was blue and white.

The french discussion talks about RAM timing and voltage, but I'm not an overclocker (vanilla i7 3770, not 3770K) so that hardly applies.

And please note that with FAH running 24/7, the computer is always under heavy load, but has never frozen while running unattended. Even when running interactively, the freezes have never been random, but has happened *exactly* when I was clicking or typing something.

Btw, I found http://www.linuxbsdos.com/2012/10/06/ubuntu-12-04-lts-and-12-10-beta-2-on-intel-ivy-bridge-powered-computer/. One of the comments indicate that 3.4 fixes some sort of freeze problem on ivy bridge/HD4000. And the partiallysanedeveloper page that I linked to in the initial bug report says that the freezes are gone in 3.3.

Here are some other other discussions of freezes on similar hardware on debian derivatives with the same kernel generation:
http://forums.linuxmint.com/viewtopic.php?f=90&t=114382
http://phoronix.com/forums/showthread.php?71895-Intel-Ivy-Bridge-On-Linux-Two-Month-Redux
http://forums.linuxmint.com/viewtopic.php?f=198&t=113070
http://ubuntuforums.org/showthread.php?t=1995945

/Per


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