Distribution: Ubuntu Lucid
Kernel version: 126.96.36.199.9
Environment used for testing: Dell XPS 1330 (All Intel)
All the info (lspci, dmesg....) are attached in the downstream bug report: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/499221
I mark this as a regression because I have karmic installed too (188.8.131.52.29 kernel) and suspend/resume works.
I think the problem is the suspend/resume of the wireless card (intel 4965 AGN) because after disabling wireless network through the networmanager-applet suspend/resume works again without problems.
Do you mean suspend is successful but during resume there is nothing show up in the screen (even kernel is not started)? Looks like a BIOS related issue.
The problem is gone after installing the 2.6.33rc2 kernel from here: http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.33-rc2/