After using powertop for a long time, on 1.x line, all configuration mod required you to make the suggested changes, now using powertop 2.x on Wheezy is only matter of doing so powertop and to apply a change more to the correct tab and press space.
I found out that NMI, VM and SATA where the resource hogs on this little atom 450 classmate, so applied the suggested changes, without knowing beforehand what they d (on the 1.x line , the proposed change was listed on a line)
So after finished dinning, resumed this machine from hibernation and got some curious messages the notebook kernel.
vicm3@classmate:~$
Message from syslogd@classmate at Oct 27 20:20:54 …
kernel:[25476.472679] Uhhuh. NMI received for unknown reason 20 on CPU 0.
Message from syslogd@classmate at Oct 27 20:20:54 …
kernel:[25476.472688] Do you have a strange power saving mode enabled?
Message from syslogd@classmate at Oct 27 20:20:54 …
kernel:[25476.472693] Dazed and confused, but trying to continue
Yes I got several warnings at hibernation time but as I just clicked on the button and close the lid, only now I’m reading, anyway the system returned without a major hitch and only reaply changes was needed…
Anyway the messages looked funny and to have them on hand I post here, also this project machine info, for future use.
cpu family : 6
model : 28
model name : Intel(R) Atom(TM) CPU N455 @ 1.66GHz
stepping : 10
microcode : 0x105
cpu MHz : 1667.000
cache size : 512 KB
Linux classmate 3.2.0-4-686-pae #1 SMP Debian 3.2.51-1 i686 GNU/Linux
vicm3@classmate:~$ more /etc/debian_version
7.2
vicm3@classmate:~$ lspci -k
00:00.0 Host bridge: Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx DMI Bridge
Subsystem: Elitegroup Computer Systems Device 997a
Kernel driver in use: agpgart-intel
00:02.0 VGA compatible controller: Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller
Subsystem: Elitegroup Computer Systems Device 997a
Kernel driver in use: i915
00:02.1 Display controller: Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller
Subsystem: Elitegroup Computer Systems Device 997a
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 02)
Subsystem: Elitegroup Computer Systems Device 90c9
Kernel driver in use: snd_hda_intel
00:1c.0 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 1 (rev 02)
Kernel driver in use: pcieport
00:1c.1 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 2 (rev 02)
Kernel driver in use: pcieport
00:1c.2 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 3 (rev 02)
Kernel driver in use: pcieport
00:1d.0 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #1 (rev 02)
Subsystem: Elitegroup Computer Systems Device 90c9
Kernel driver in use: uhci_hcd
00:1d.1 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #2 (rev 02)
Subsystem: Elitegroup Computer Systems Device 90c9
Kernel driver in use: uhci_hcd
00:1d.2 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #3 (rev 02)
Subsystem: Elitegroup Computer Systems Device 90c9
Kernel driver in use: uhci_hcd
00:1d.3 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller #4 (rev 02)
Subsystem: Elitegroup Computer Systems Device 90c9
Kernel driver in use: uhci_hcd
00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller (rev 02)
Subsystem: Elitegroup Computer Systems Device 90c9
Kernel driver in use: ehci_hcd
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation NM10 Family LPC Controller (rev 02)
Subsystem: Elitegroup Computer Systems Device 90c9
00:1f.2 SATA controller: Intel Corporation NM10/ICH7 Family SATA Controller [AHCI mode] (rev 02)
Subsystem: Elitegroup Computer Systems Device 90c9
Kernel driver in use: ahci
00:1f.3 SMBus: Intel Corporation NM10/ICH7 Family SMBus Controller (rev 02)
Subsystem: Elitegroup Computer Systems Device 90c9
Kernel driver in use: i801_smbus
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
Subsystem: Elitegroup Computer Systems Device 90c9
Kernel driver in use: r8169
07:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8191SEvB Wireless LAN Controller (rev 10)
Subsystem: Realtek Semiconductor Co., Ltd. Device 8181
Kernel driver in use: rtl8192se
