Fail to suspend to ram: "Class driver suspend failed for cpu0"

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Hello,

I have a beagle board with OMAP3530. I ported linux-omap-pm2.6.32 to
this board. When I want to let it suspend to ram, it fails and I get
the message "Class driver suspend failed for cpu0". Here is the log:

root@beagleboard:~# echo mem > /sys/power/state
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
omapfb omapfb: timeout waiting for FRAME DONE
Class driver suspend failed for cpu0
Restarting tasks ... done.

*********************************************

Is there any idea to fix this problem? Thanks.

-- 
Luke
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