After numerous hours of reverting commits, building, compiling, installing, and attempting to suspend, I can rule out with certainty any libata, usb, and pci restoration changes as culprits.
** Description changed: Regression introduced with 2.6.15-25 (worked fine with all previous - kernels) - the machine will not wake up from suspend or hibernate. - Lifting the lid or pressing the power button has no effect - the machine - remains asleep. + kernels) - the machine will not suspend and thus will not resume. -- [regression] Suspend [to-RAM and to-disk] is broken in 2.6.15-25.43 https://launchpad.net/bugs/50031 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs