switch to VT1 by pressing Ctrl-Alt-F1. Login at the prompt there and
then run the following commands:

sudo echo 1 > /sys/power/pm_trace

setfont /usr/share/consolefonts/Uni1-VGA8.psf.gz
      
sudo pm-suspend

And see if you can collect more dmesg info or photo of the screen if it
spits out more information.

-- 
[Dell XPS M1710] suspend/resume failure [non-free: nvidia]
https://bugs.launchpad.net/bugs/347548
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