kpowersave suspend-to-ram does not work

While klaptopdaemon in kubuntu feisty does work properly, kpowersave doesn't. After resuming, the login mask is displayed, enlarged, rather that the suspended session.
Ctrl-Alt-Bksp restarts kdm, so that the login mask has the right resolution. My suspended session is lost however.   

 In the kdm.log file, i have noticed the enclosed lines.   

 Any ideas?
 What to look for, in the suspend2ram.log file?   

 Thank you for your help   

 Pol   

• enc. /var/log/kdm.log (...) Synaptics DeviceOff called Error in I830WaitLpRing(), now is 1918364, start is 1916363 pgetbl_ctl: 0x5ffc0001 pgetbl_err: 0x0 ipeir: 0 iphdr: 0 LP ring tail: 8 head: 0 len: 1f001 start 0 eir: 0 esr: 1 emr: ffff instdone: ffc1 instpm: 0 memmode: 306 instps: 2014c0 hwstam: ffff ier: 0 imr: ffff iir: 0 space: 131056 wanted 131064

 Fatal server error:
 lockup   

 Error in I830WaitLpRing(), now is 1924451, start is 1919375  pgetbl_ctl: 0x5ffc0001 pgetbl_err: 0x0  ipeir: 0 iphdr: 0
 LP ring tail: 10 head: 0 len: 1f001 start 0  eir: 0 esr: 1 emr: ffff
 instdone: ffc1 instpm: 0  

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 memmode: 306 instps: 2014c0
 hwstam: ffff ier: 0 imr: ffff iir: 0
 space: 131048 wanted 131064   

 FatalError re-entered, aborting
 lockup

(...)   

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