Resume regression: CPU1 not restarting on Core Duo with 2.6.22-9

[Jamie Lokier]

Binary package hint: acpi

I'm use Ubuntu Gutsy on a Fujitsu-Siemens Amilo Si-1520.
It has a Core Duo CPU (it has 2 cores).

Suspend to RAM works most of the time with 2.6.22-8 and earlier kernels.

(Sometimes on suspend it hangs with a corrupt text mode screen, but I suspect that is the Intel video driver. Sometimes on resume it simply boots instead of resuming, but this bug report isn't about that).

With 2.6.22-9 kernels, I have found it consistently fails to resume one of the CPU cores, and the caps lock light flashes continuously after resume. /proc/cpuinfo shows only one core after resume, and the CPU frequency monitoring panel applet (which shows both cores normally) crashes.

During resume, a screen full of text errors mentioning ACPI appears quickly. (This doesn't happen with the older kernels), and then X reappears. Most of the error messages are lost, but a capture of /dev/vcs7 is attached.

In /var/log/messages, there's a suggestive message "Error taking CPU1 up: -5". All messages around the time of suspend and resume are attached. Even if there's a failure to restart CPU1, it shouldn't cause a "kernel panic" as appears on vcs7, I guess, but maybe that's the cause of the restart failure.

Ubuntu Gutsy kernels 2.6.22-8 and 2.6.22-7 don't have this problem; I've never seen it with them. 2.6.22-9 has it consistently on every resume.

Thanks

Thanks

[Jamie Lokier (jamie-shareable)]

The kernel panic message isn't lost. Here's the output of "dmesg" from the start of that suspend to the end of the resume. It's a kernel Oops, unable to handle paging request, and therefore a fairly clear bug.

[Jamie Lokier (jamie-shareable)]

The exact kernel for that panic backtrace is linux-image-2.6.22-9-generic, version 2.6.22-9.25, from Ubuntu Gutsy. I have seen the same problem with earlier 2.6.22-9 kernels from Gutsy, and never with 2.6.22-8 or earlier kernels. When I want a reliable system for work I use 2.6.22-7.14 (the current 2.6.22-7), as 2.6.22-8 has other occasional suspend problems.

[rotznase (gunnar-salbeck-cvmx)]

with dell inspiron 6400 and intel centrino duo i have the same problem after resume.

here the output from kern.log

http://www.ubuntuusers.de/paste/13638/

hope it helps.

good luck.

[kgerstl (kgerstl-deactivatedaccount)]

Core Duo T2400 on Intel i945GM/PM shows the same behaviour: Wakes up fine but only with one core.