Ok. Here are some information about my BIOS.
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sudo dmidecode | grep BIOS
SMBIOS 2.4 present.
BIOS Information
BIOS is upgradeable
BIOS shadowing is allowed
BIOS ROM is socketed
BIOS Revision: 15.20
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It's perhaps a stupid idea, but the fact that I can suspend to RAM while I'm in
Windows 7 don't show us that my BIOS allows to suspend ?
I'm going to make a "apport-collect" just after this message, after I-ve
tied to suspend my computer (and got a lock screen).
Do you want me to update my BIOS ?
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=ob-75233-1&lc=fr&dlc=en&cc=en&lang=en&os=4062&product=3755994
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HP DV5 - Can't suspend, get a Lock Screen instad of suspend
https://bugs.launchpad.net/bugs/501323
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