On XP, during hibernation a progress bar shows me how long I have to wait for completing the operation. On Seven, I see no progress bar and the monitor turn off at once while the OS saves the ram on the disk. Same thing during the wake up process after the hibernation. Is it possible to have the progress bar for hibernation and following wake up on Seven?
The feature was removed as of Windows Vista, and was not added back into Windows 7. It does not appear that this feature is able to be added back in. See: http://www.adopenstatic.com/cs/blogs/ken/archive/2006/12/26/919.aspx
No progress bar
That's by design since Windows Vista:
While you can't have a hibernation progress bar, you can still disable the standard animation shown during the resume process, and display a basic progress indicator instead. To do so, follow these steps: