ASUS Eee PC 1015pn

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Revision as of 19:00, 30 January 2011 by Pulsar (Talk | contribs) ( Method 2)

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This page includes general information regarding Asus EEE PC 1015pn and related notes on installing/using Arch Linux on it.

System Specs

  • CPU: Intel Atom Dual-Core N550 (1.5 GHz)
  • RAM: 1GB 1066MHz DDR3
  • HDD: 250 5400RPM
  • GPU: nVidia ION2 with Optimus
  • Display: 10,1" 1024 x 600 pixels LCD display
  • Wireless: BCM4313
  • Bluetooth: TODO
  • Webcam: TODO
  • Card Reader: TODO
  • Extras: 3 USB 2.0 ports, Bluetooth 3

HDD important issue

With the Western Digital hard drive (not SSD), there is an important issue: using the APM (Advanced Power Management) there are too nomerous spin-down, that can damage the hard drive. To confirm this issue you have to install smartmontools:

# pacman -S smartmontools

And you have to run multiple times this command (once in a minute for like 5 minutes):

# smartctl -a /dev/sda|grep Load_Cycle_Count

If the number under Load_Cycle_Count is increasing in a small amount of time (1 or 2 in a minute) you have this issue.

Method 1

The problem is easily solvable using laptop-mode-tools. In your /etc/laptop-mode/laptop-mode.conf you have to set:

#
# Should laptop mode tools control the hard drive power management settings?
#
CONTROL_HD_POWERMGMT=1

#
# Power management for HD (hdparm -B values)
#
BATT_HD_POWERMGMT=255
LM_AC_HD_POWERMGMT=255
NOLM_AC_HD_POWERMGMT=255

This disable all power management systems of the hard drive cause a light heat up (maybe). The same behaviour can be obtained running this command:

# hdparm -B 255 /dev/sda

the 255 number is the power-management level, in a range of 1-255 where 1 is maximum powersaving and 255 powersaving disabled. However setting the value to 253 causes a lot of spin-down. Setting the spin-down feature (it parks the heads away from disk) however can save hdd in case of fall.

 Method 2

This method correct this issue once and for all : WDIDLE3

nVidia ION 2 with Optimus

Optimus doesn't work at all but it is possible to choose which graphical card will be used on next reboot.

You can get 2 'modes' :

  • By default (if you don't do anything) the machine starts with the Nvidia beeing the only VGA controller visible (so it will use the ION chip).
  • Using some tools you can start with the Intel and Nvidia VGA controller visible. In this mode the Intel controller is used and it's possible to powerdown the Nvidia part.


To switch between those modes you will need acpi_call.

Installing acpi_call

Manual Install:

git clone http://github.com/mkottman/acpi_call.git
cd acpi_call
make
sudo insmod acpi_call.ko

OR

Using AUR (recommended):

yaourt -S acpi_call-git

Add acpi_call module into /etc/rc.conf


Selecting Video Card

To select Intel + Nvidia on next reboot :

echo "\OSGS 0x03" > /proc/acpi/call

Note: You will need to do this at each boot as long as you want to stay with the Intel part (If you don't do this the Eee will start with only the Nvidia Ion part).


You can check the current mode with :

echo "\AMW0.DSTS 0x90013" > /proc/acpi/call
cat /proc/acpi/call

For example if the result is 0x30003 :

  • First byte 0x03 means mode 3 (returnvalue &= 3)
  • Logical AND with 0x10000 and right-bitshift 16 bytes gives whether Optimus is supported (1=true, 0=false): here 1


After reboot you can see with lspci that the Intel VGA controller is visible. You can now power down the ion part with (you'll need the acpi_call module loaded):

echo "\_SB.PCI0.P0P4.DGPU.DOFF" > /proc/acpi/call

Note: When leaving suspend you need to do this again because the Nvidia part reactivates itself.

Check consumption

You can check consumption with :

cat /proc/acpi/battery/BAT0/state 
  • Before disabling: ~1700mA.
  • After disabling: ~1000mA.

As you can see this method saves a lot of battery !

ACPI

To enable acpi you need to edit menu.lst and add acpi_osi=Linux to the kernel line like so:

 kernel /boot/vmlinuz26 root=/dev/sda1 ro acpi_osi=Linux

This enabled you to trigger devices in /sys/devices/platform/eeepc/.

Wireless

The Broadcom BCM4313 card requires the compat-wireless-brcm80211 module which is available in the AUR.

To Do

Manage to get the xf86-video-intel and nvidia packages installed (specific libgl being used by each one)

 Links