I have found the solution !!!

In fact, I force the ACPI_OS_NAME to "Windows 2001" just to activate the
same functions as in Windows. And now, that works like a charm. Would
you please try the workaround ? It's easy, you just have to add

acpi_os_name="Windows 2001"

at the end of the line concerning your kernel in the menu.lst from
/boot/grub/menu.lst.

-- 
after sleep+resume I can't restart the system
https://bugs.launchpad.net/bugs/29695
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