Comment 4 for bug 587457

Ok I tried:
linux-image-2.6.32-02063211-generic_2.6.32-02063211_amd64.deb
after echo 3 > /proc/acpi/sleep
effect is the same
also installed newest mainline 2.6.35 - without changes, but on this also tried different test options
Firstly tested every of those options:
core processors platform devices freezer
passed to /sys/power/pm_test
- the kernel always resumed properly. But after passing "none" to /sys/power/pm_test the system freezed again.

During this freeze(on every kernel) system doesn't responds to SysRq requests, screen is black with backlight and single underscore character(non blinking) and quickly after hang up fan accelerates so I think CPU is used, maybe some infinite loop in kernel code?

While skipping through those kernels I've seen quite different Magic numbers in dmesg:

root@novopad:~/kernel# cat 2.6.35_dmesg.txt | grep -C 5 Magic
[ 0.817683] NET: Registered protocol family 10
[ 0.818013] lo: Disabled Privacy Extensions
[ 0.818216] NET: Registered protocol family 17
[ 0.819624] PM: Resume from disk failed.
[ 0.819635] registered taskstats version 1
[ 0.820119] Magic number: 14:963:844
[ 0.820219] rtc_cmos 00:07: setting system clock to 2010-06-05 17:49:26 UTC (1275760166)
[ 0.820225] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
[ 0.820229] EDD information not available.
[ 0.820327] Freeing unused kernel memory: 948k freed
[ 0.820584] Write protecting the kernel read-only data: 10240k

or
[ 0.820066] Magic number: 14:795:88
[ 0.820091] pcie_pme 0000:00:1c.2:pcie01: hash matches

or
 on standard ubuntu 2.6.32:
nusch@novopad:~$ dmesg | grep -C 5 Magic
[ 0.605918] NET: Registered protocol family 10
[ 0.606292] lo: Disabled Privacy Extensions
[ 0.606529] NET: Registered protocol family 17
[ 0.607911] PM: Resume from disk failed.
[ 0.607927] registered taskstats version 1
[ 0.608602] Magic number: 14:898:189
[ 0.608649] acpi device:1b: hash matches
[ 0.608710] rtc_cmos 00:07: setting system clock to 2010-06-05 18:09:02 UTC (1275761342)
[ 0.608713] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
[ 0.608714] EDD information not available.
[ 0.608793] Freeing unused kernel memory: 876k freed

nusch@novopad:~$ lspci | grep 1b
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)

I tried some time ago unloading every single module listed in lsmod and, it didn't help suspend, I can't physically unconnect devices in my laptop because it'll void warranty.