Машинка:

System:    Host: mkhome Kernel: 3.15.5-calculate x86_64 (64 bit) Desktop: Xfce 4.10.2 
           Distro: Calculate Linux Desktop 13.19 XFCE 
Machine:   Mobo: ASRock model: FM2A55M-VG3+ serial: M80-3B002604544
           Bios: American Megatrends v: P1.00 date: 10/14/2013
CPU:       Quad core AMD A10-5700 APU with Radeon HD Graphics (-MCP-) cache: 8192 KB 
           Clock Speeds: 1: 1400 MHz 2: 2600 MHz 3: 1400 MHz 4: 1400 MHz
Graphics:  Card: NVIDIA GT218 [GeForce 210]
           Display Server: X.org 1.15.0 driver: nvidia tty size: 207x62 Advanced Data: N/A for root

перестала "засыпать". в логах:

Jul 23 03:39:26 mkhome dbus³³⁷⁵: [system] Rejected send message, 6 matched rules; type="method_call", sender=":1.31" (uid=1001 pid=6566 comm="xfce4-power-manager ") interface="org.freedesktop.NetworkManager" member="Sleep" error name="(unset)" requested_reply="0" destination="org.freedesktop.NetworkManager" (uid=0 pid=15291 comm="/usr/sbin/NetworkManager --pid-file /run/NetworkMa")
Jul 23 03:39:54 mkhome dbus³³⁷⁵: [system] Rejected send message, 6 matched rules; type="method_call", sender=":1.31" (uid=1001 pid=6566 comm="xfce4-power-manager ") interface="org.freedesktop.NetworkManager" member="Sleep" error name="(unset)" requested_reply="0" destination="org.freedesktop.NetworkManager" (uid=0 pid=15291 comm="/usr/sbin/NetworkManager --pid-file /run/NetworkMa")
Jul 23 03:48:40 mkhome kernel: uvesafb: probe of uvesafb.0 failed with error -5