- Does the failure happen during suspend or resume ?
- Is it reproducible ?
- has suspend resume worked for you before ?

Can you please try to do the following ?

sudo echo 1 > /sys/power/pm_trace
setfont /usr/share/consolefonts/Uni1-VGA8.psf.gz
sudo pm-suspend

And collect dmesg data and may be a photo of the screen if it spits out
any additional information ?

-- 
[Sony Corporation VGN-Z21VN_X] suspend/resume failure
https://bugs.launchpad.net/bugs/347337
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