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Lenovo notebook can not shutdown, suspend or hibernate properly. Reboot works. What can cause this?

When a command to shutdown/hibernate/suspend is issued the system will go down properly. But then it will not power off. Instead it keeps running with a black screen. Resetting the notebook is the only way to stop it then.

The system is a fresh installation of fedora 20 on a Lenovo ideapad. The installation failed due to an error while installing the bootloader. The bootloader was installed manually later.

So: What are possible reasons and how can they be diagnosed?

Lenovo notebook can not shutdown, suspend or hibernate properly. Reboot works. What can cause this?

When a command to shutdown/hibernate/suspend is issued the system will go down properly. But then it will not power off. Instead it keeps running with a black screen. Resetting the notebook is the only way to stop it then.

The system is a fresh installation of fedora 20 on a Lenovo ideapad. The installation failed due to an error while installing the bootloader. The bootloader was installed manually later.

So: What are possible reasons and how can they be diagnosed?

EDIT: When shutdown the last message displayed is something like:

[ACPI:] preparing system for sleep sate S5

When hibernated/suspended the display turns black while the system is still running.