Linux - Debian no me apaga el PC

Hola, muy buenas.

Tengo debian wheezy 7.7.0 amd686 instalado y cuando le doy a apagar, desaparece el escritorio, se pone el monitor en negro y después me dice el monitor que no hay nada conectado, pero el pc sigue encendido y tengo que apagar en el botón.

Con ubuntu no me ocurre esto, con lo cual no creo que sea problema de la BIOS. He mirado el syslog y al final de la session esto es lo que me indica...

Dec 20 02:43:37 usuario shutdown[4826]: shutting down for system halt
Dec 20 02:43:37 usuario pulseaudio[3948]: [pulseaudio] module-alsa-card.c: Failed to find a working profile.
Dec 20 02:43:37 usuario pulseaudio[3948]: [pulseaudio] module.c: Failed to load module "module-alsa-card" (argument: "device_id="0" name="pci-0000_00_03.0" card_name="alsa_card.pci-0000_00_03.0" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes card_properties="module-udev-detect.discovered=1""): initialization failed.
Dec 20 02:43:37 usuario NetworkManager[3297]: <warn> error requesting auth for org.freedesktop.NetworkManager.enable-disable-network: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.59': no such name
Dec 20 02:43:37 usuario NetworkManager[3297]: <warn> error requesting auth for org.freedesktop.NetworkManager.sleep-wake: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.59': no such name
Dec 20 02:43:37 usuario NetworkManager[3297]: <warn> error requesting auth for org.freedesktop.NetworkManager.enable-disable-wifi: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.59': no such name
Dec 20 02:43:37 usuario NetworkManager[3297]: <warn> error requesting auth for org.freedesktop.NetworkManager.enable-disable-wwan: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.59': no such name
Dec 20 02:43:37 usuario NetworkManager[3297]: <warn> error requesting auth for org.freedesktop.NetworkManager.enable-disable-wimax: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.59': no such name
Dec 20 02:43:37 usuario NetworkManager[3297]: <warn> error requesting auth for org.freedesktop.NetworkManager.network-control: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.59': no such name
Dec 20 02:43:37 usuario NetworkManager[3297]: <warn> error requesting auth for org.freedesktop.NetworkManager.wifi.share.protected: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.59': no such name
Dec 20 02:43:37 usuario NetworkManager[3297]: <warn> error requesting auth for org.freedesktop.NetworkManager.wifi.share.open: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.59': no such name
Dec 20 02:43:37 usuario NetworkManager[3297]: <warn> error requesting auth for org.freedesktop.NetworkManager.settings.modify.system: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.59': no such name
Dec 20 02:43:37 usuario NetworkManager[3297]: <warn> error requesting auth for org.freedesktop.NetworkManager.settings.modify.own: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.59': no such name
Dec 20 02:43:37 usuario NetworkManager[3297]: <warn> error requesting auth for org.freedesktop.NetworkManager.settings.modify.hostname: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.59': no such name

A ver si alguien me puede orientar, porque la búsqueda en google de momento no me dice nada.

Salu2