Public bug reported:
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
** Affects: acpi (Ubuntu)
Importance: Undecided
Status: New
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Resume regression: CPU1 not restarting on Core Duo with 2.6.22-9
https://bugs.launchpad.net/bugs/131752
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