This problem also affects my Toshiba Tecra M3. Suspend/resume worked
under Gutsy but fails with all release Hardy kernels and the current
Intrepid kernel. They would resume to a blank screen without accepting
any input necessitating a hard reboot.

Adding this to /etc/pm/config.d/config:

SUSPEND_MODULES="ehci_hcd"

fixes the problem. LSPCI output is attached. /proc/version_signature is
"Ubuntu 2.6.27-7.16-generic"

I found this out using the pm_trace function, the relevant portion of
dmesg output is:

[    1.851860]   Magic number: 0:250:259
[    1.851865]   hash matches 
/build/buildd/linux-2.6.27/drivers/base/power/main.c:350
[    1.851884] tty ttyx1: hash matches
[    1.851958] pci 0000:00:1d.7: hash matches
[    1.852017] rtc_cmos 00:08: setting system clock to 2068-04-03 03:15:29 UTC 
(3100648529)

I presume this bug is the correct place to file the issue, if anyone
wants to report under Intrepid please do so :).

** Attachment added: "Toshiba Tecra M3 lscpi"
   http://launchpadlibrarian.net/19664165/lspci-vvnn.log

-- 
[Hardy] [regression] ehci_hcd.ko breaks suspend-to-ram
https://bugs.launchpad.net/bugs/211572
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