My system (Tyan S2923-E, dmesg attached) suspends ok in all pm_test modes, but it 
won't resume with pm_test "none".

[    6.423515] mem full: hash matches

When I press the power button, the port 80 display shows:
 FF D0 23 01 D0 ... DE
(and again each time I press it)

If I force it to turn off, then on again:
 FF D0 23 01 D0 ... FF D0 23 01 D0 ... (D2?) D3 00 01 D5 D6 <normal boot>

Any ideas? (onboard SAS is disabled, watchdog is disabled, everything else is 
enabled, PCI-E graphics card)

-- 
Simon Arlott