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[[Category:Archive]]
This article provides information about installing and setting up Arch Linux on the Samsung N140. It is also relevant for the Samsung N130 which is identical except for the omission of Bluetooth and stereo speakers (and possibly a different battery capacity). There are versions of the N130 which include a 3G cellular modem, available from Vodafone and China Mobile. The [[Samsung NC10]] is similar but not identical to the N140, so you may or may not find useful information on that page.
 
 
 
=Issues=
 
 
 
==BIOS Issues==
 
===No backlight setting via ACPI===
 
 
 
A workaround is to use "setpci" as shown below.
 
 
 
Alternatively there is a kernel patch (unrelated to the SATA freeze problem) available which changes the backlight brightness using SMI instead of poking PCI config space. It provides a kernel module called "samsung-laptop". Interestingly we see from a version of this patch which is included in OpenSUSE 11.1 that a special (as yet unreleased?) BIOS for the N130 can be informed that the OS is Linux. The effect of this hasn't been published. Suggestion: run the samsung-laptop module with its debug parameter set to 1 to check whether it does anything at all.
 
 
 
===No key releases for some Fn keys===
 
 
 
Some of the Fn keys give key press events but no key releases. This problem was also seen on the NC10 and NC20. A workaround is given below. For kernels 2.6.32 and later this can be done from userspace.
 
 
 
=Installation=
 
 
 
Do the standard Arch installation procedure from the ARCH CD ISO using an external USB CDROM drive. Alternatively boot the Arch installer from a USB flash drive.
 
 
 
The standard Arch kernel is recommended (2.6.34 or later).
 
 
 
A number of users have used a custom kernel for the following reasons:
 
* to boot with a minimal kernel containing just the required modules and without an initial ramdisk.
 
 
 
==Custom kernel: without initrd (AUR)==
 
 
 
An AUR package [https://aur.archlinux.org/packages.php?ID=52790 linux-n130] is available. In this kernel most drivers are compiled in and there is no initial ramdisk. The drivers for cpu frequency scaling (acpi-cpufreq), wifi (ath9k, rtl8192e) and webcam (uvcvideo) are compiled as modules (i.e. '''not''' compiled in) so they can be inserted or removed from the kernel to enable or disable those features. MODULES in /etc/rc.conf can be used to enable or disable loading at boot.
 
 
 
Prepare the directory
 
$ mkdir ~/builds
 
$ mkdir ~/builds/linux-n130
 
$ cd ~/builds/linux-n130
 
Get the AUR package and untar it
 
$ wget https://aur.archlinux.org/packages/li/linux-n130/linux-n130.tar.gz
 
$ tar zxvf linux-n130.tar.gz
 
$ cd linux-n130
 
 
 
At this point you can edit the PKGBUILD file if you need to (i) change the name or version number,
 
(ii) change options or (iii) add additional patches.
 
 
 
Check the PKGBUILD. Don't experiment with the CK patchset at this point:
 
_USE_CK_PATCHSET=0
 
Compile it (this will take some time...):
 
$ makepkg -s
 
Install the kernel from the new .pkg.tar.gz file
 
$ sudo pacman -U linux-n130-2.6.<xx.yy>-<rr>.pkg.tar.gz
 
 
Then, assuming you are using [[GRUB]], insert a new item in your {{ic|/boot/grub/menu.lst}} to boot the new kernel "linux-N130". Note that no initrd line is necessary for this kernel.
 
<pre>
 
# (0) Arch Linux N130
 
title  Arch Linux Custom N130 Kernel
 
root  (hd0,YOURROOT-1)
 
kernel /boot/vmlinuz-N130 root=/dev/sdaYOURROOT resume=/dev/sdaYOURSWAP ro quiet
 
</pre>
 
And reboot. If you have problems the standard Arch kernel is still installed and selectable from the GRUB menu.
 
 
 
For [[GRUB2]] {{ic|/boot/grub/grub.cfg}} the syntax looks like this (sda1 = your root partition; sda2 = your swap partition)
 
 
 
<pre>
 
menuentry "Arch Linux N130" {
 
        set root=(hd0,1)
 
        linux /boot/vmlinuz-N130 root=/dev/sda1 resume=/dev/sda2 ro quiet
 
}
 
</pre>
 
 
 
{{Note|The linux-n130 has the i915 module compiled in with KMS enabled by default. There is no need to set up KMS as described below unless you wish to disable it.}}
 
 
 
=Configure your installation=
 
 
 
==Ethernet==
 
 
 
RTL8101e/8102e fast ethernet. Works out of the box.
 
 
 
==Wifi==
 
 
 
The supplied wifi device is either an Atheros AR9285 (PCI ID = 168c:002b) (European markets) or a Realtek RTL8192E (US and UK markets).
 
 
 
===Atheros AR9285===
 
02:00.0 Network controller [0280]: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) [168c:002b] (rev 01)
 
 
 
The kernel module for this device is "ath9k" (AR9285 is supported since 2.6.29).
 
 
 
Kernels 2.6.30 and 2.6.32-rcN release candidates seem to work fine.
 
However with kernel 2.6.31 the wireless connection exhibits frequent
 
disconnects and reattachments,
 
resulting in periods of bad througput and periods of good throughput.
 
There is no sign of any patches for 2.6.31.y to fix this regression.
 
Complain to linux-wireless@vger.kernel.org. To get it working either
 
downgrade to 2.6.30 or preferably upgrade to 2.6.32.
 
 
 
The following patch was included in 2.6.32 just before the final release: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=54ab040d24904d1fa2c0a6a27936b7c56a4efb24 . It disables PS (power saving) mode by default, since this mode was found to have problems. See here http://bugzilla.kernel.org/show_bug.cgi?id=14267 . PS mode can also be disabled with the following command, which can be placed in {{ic|/etc/rc.local}}:
 
iwconfig wlan0 power off
 
 
 
===Realtek RTL8192E===
 
====Open source driver====
 
The native Linux driver for this wireless device is still in preparation, but it is available as a kernel module "rtl8192e" in "staging" -- i.e. in preparation for inclusion in the kernel and available to try out, but likely to still have some problems. It has been reported as working [https://bbs.archlinux.org/viewtopic.php?id=86454&p=6]. Firmware is required. See
 
http://lkml.org/lkml/2009/12/15/410.
 
 
 
The firmware is available in the <code>linux-firmware</code> package:
 
 
# pacman -S linux-firmware
 
 
 
Then
 
$ md5sum /lib/firmware/RTL8192E/*
 
should return
 
bb9f64de23939ec247d15dfbeb0ed91e  /lib/firmware/RTL8192E/boot.img
 
db83def0338769de1d4658a00b6f738d  /lib/firmware/RTL8192E/data.img
 
0034020e5a32571f486849aa90a389a7  /lib/firmware/RTL8192E/main.img
 
 
 
On rebooting, the kernel messages (visible with "dmesg") should now indicate that rtl819xE finds the firmware for loading into the device.
 
 
 
Note: [[wicd]] may cause excessive dropped connections with this driver, while [[NetworkManager]] appears to work better.
 
 
 
====Ndiswrapper====
 
It has been reported as working with [[Wireless_Setup#ndiswrapper|ndiswrapper]] which makes use of the closed source Windows driver under Linux.
 
 
 
==Cellular 3G Modem==
 
 
 
''Specifications required''
 
 
 
==Graphics Adapter==
 
 
 
The video controller is an Intel chipset that works with the xf86-video-intel driver.
 
 
 
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GME Express Integrated Graphics Controller [8086:27ae] (rev 03)
 
00:02.1 Display controller [0380]: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller [8086:27a6] (rev 03)
 
 
 
===Kernel Mode Setting===
 
 
 
See also [[Intel#KMS_.28Kernel_Mode_Setting.29]].
 
 
 
[[KMS]] works providing real consoles at the native LCD resolution, 1024x600.
 
There is a known problem with 2.6.32 kernels (later release candidates up to at least release 2.6.32.8),
 
which results in screen flickering and blackouts about 5 minutes after resuming
 
from suspend-to-RAM or suspend-to-disk.
 
 
 
{{Note|If you encounter screen flickering or blackouts with KMS enabled, try setting '''i915.powersave&#61;0''' as a kernel boot option.}}
 
 
 
{{Note|Since version 2.10.0 of xf86-video-intel, support for UMS has been removed from the intel driver. This means that KMS is a requirement now.}}
 
 
 
====Method A====
 
 
 
If you are using a kernel with no inital ramdisk and you can simply add the required options to the GRUB kernel line:h
 
 
 
# (0) Arch Linux N130
 
title  Arch Linux Custom N130 Kernel
 
root  (hd0,YOURROOT-1)
 
kernel /boot/vmlinuz26-N130 root=/dev/sdaYOURROOT resume=/dev/sdaYOURSWAP ro quiet '''i915.powersave=0 i915.modeset=1'''
 
 
 
====Method B====
 
 
 
If you are using an initial ramdisk (either the standard kernel or the custom kernel method B above) then do the following:
 
 
 
Edit {{ic|/etc/modprobe.d/modprobe.conf}}:
 
        options i915 powersave=0
 
        options i915 modeset=1
 
Edit {{ic|/etc/mkinitcpio.conf}}:
 
        MODULES="intel_agp i915"
 
        FILES="/etc/modprobe.d/modprobe.conf"
 
Put keymap early in {{ic|/etc/mkinitcpio.conf}} HOOKS.
 
Regenerate the init ramdisk for the kernel(s) you are running:
 
        $ mkinitcpio -p linux
 
        or
 
        $ mkinitcpio -p linux-n140
 
Remove any vga= or video= from grub {{ic|/boot/grub/menu.lst}} kernel line, and reboot.
 
 
 
====KMS with KDE====
 
 
 
With earlier versions of KDE, on logout it returned to the F1 real console instead of to [[KDM]].
 
Uncommenting this entry in {{ic|/usr/share/config/kdm/kdmrc}} solved the problem:
 
  TerminateServer=true
 
This setting is now the default.
 
 
 
===Backlight Brightness===
 
xbacklight does not work currently.
 
However the brightness can be set with the following command
 
 
 
setpci -s 00:02.1 F4.B=hh
 
 
 
where hh is the level of brightness, in the range 00 to FF. Don't set it to zero
 
because your backlight will turn off!
 
 
 
Note this does not require the samsung-laptop patch mentioned above.
 
 
 
Use the following script to increase and decrease the brightness. Put it in
 
/sbin/backlight for example. Use xbindkeys to bind commands to the backlight Fn keys.
 
Obtain sudo permission for user to use those commands with visudo.
 
 
 
  #!/bin/bash
 
  # increase/decrease/set/get the backlight brightness (range 0-255) by 16
 
  #
 
  #get current brightness in hex and convert to decimal
 
  var1=`setpci -s 00:02.1 F4.B`
 
  var1d=$((0x$var1))
 
  case "$1" in
 
        up)
 
                #calculate new brightness
 
                var2=`echo "ibase=10; obase=16; a=($var1d+16);if (a<255) print a else print 255" | bc`
 
                echo "$0: increasing brightness from 0x$var1 to 0x$var2"
 
                setpci -s 00:02.1 F4.B=$var2
 
                ;;
 
        down)
 
                #calculate new brightness
 
                var2=`echo "ibase=10; obase=16; a=($var1d-16);if (a>15) print a else print 15" | bc`
 
                echo "$0: decreasing brightness from 0x$var1 to 0x$var2"
 
                setpci -s 00:02.1 F4.B=$var2
 
                ;;
 
        set)
 
                #n.b. this does allow "set 0" i.e. backlight off
 
                echo "$0: setting brightness to 0x$2"
 
                setpci -s 00:02.1 F4.B=$2
 
                ;;
 
        get)
 
                echo "$0: current brightness is 0x$var1"
 
                ;;
 
        toggle)
 
                if [ $var1d -eq 0 ] ; then
 
                        echo "toggling up"
 
                        setpci -s 00:02.1 F4.B=FF
 
                else
 
                        echo "toggling down"
 
                        setpci -s 00:02.1 F4.B=0
 
                fi
 
                ;;
 
        *)
 
                echo "usage: $0 {up|down|set <val>|get|toggle}"
 
                ;;
 
  esac
 
  exit 0
 
 
 
===External VGA===
 
 
 
External VGA works out of the box with xrandr / krandrtray. Tested at 1920x1080 resolution.
 
 
 
==Audio==
 
 
 
The audio device is an Intel HD.
 
00:1b.0 Audio device [0403]: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller [8086:27d8] (rev 02)
 
 
 
==Suspend and Hibernate==
 
 
 
Suspend to RAM with pm-suspend works.
 
 
 
It is most useful to trigger suspends using [[acpid]].
 
 
 
To catch the "sleep" function key, edit {{ic|/etc/acpi/handler.sh}} so that the button/sleep) event calls /usr/sbin/pm-suspend (instead of "echo mem > /sys/power/state" which may leave wifi down after resume):
 
<pre>
 
    button/sleep)
 
        case "$2" in
 
            SLPB)  logger "Sleep button pressed, suspending to RAM"
 
                    /usr/sbin/pm-suspend
 
                    ;;
 
            *)      logger "ACPI action undefined: $2"
 
                    ;;
 
        esac
 
        ;;
 
</pre>
 
When catching the lid closure, the button/lid event will be seen twice -- once on suspend
 
and again on resume. So use the lid state to distinguish between these so that pm-suspend
 
is not triggered twice:
 
 
 
Enter the following lines in {{ic|/etc/acpi/handler.sh}}:
 
    button/lid)
 
        if [ `/bin/awk '{print $2}' /proc/acpi/button/lid/LID0/state` = closed ]; then
 
            /usr/sbin/pm-suspend
 
        fi
 
        ;;
 
 
 
Hibernate works correctly (see [[pm-utils|pm-utils article]]).
 
 
 
If you are a KDE4 user you can take advantage of powerdevil (included in kdemod-core/kdemod-kdebase-workspace since release 4.2) to manipulate the screen brightness, cpu scaling and hibernate. Suspend
 
from KDE works too, but if you are using handler.sh to suspend on the button/lid and button/sleep acpi
 
events, then KDE only needs to lock the screen. Note that cpu scaling requires acpi-cpufreq module
 
to be loaded in MODULES in /etc/rc.conf.
 
 
 
==Fn Keys==
 
 
 
Firstly edit {{ic|/usr/share/hal/fdi/information/10freedesktop/30-keymap-misc.fdi}}
 
and insert N140 into the list where you see NC10 already.
 
 
 
Now in a real console
 
  showkey
 
 
 
will show presses for the function keys, but ''no releases'' for some of them.
 
 
 
This is a BIOS issue which was also found on the Samsung NC10. A workaround quirk was put in the
 
kernel in atkbd.c for the NC10. Patching this routine to apply the same
 
quirk also works for the N140, and is recommended for 2.6.31 and earlier.
 
However for 2.6.32 and later (i.e. any current Arch installation) there is a much simpler solution because this quirk can now be applied from user space. Simply edit {{ic|/etc/rc.local}} and add the following line:
 
 
 
  echo 130,131,132,134,136,137,179,247,249 > /sys/devices/platform/i8042/serio0/force_release
 
 
 
After this is run, doing "showkey" in a real console will show key presses and releases.
 
 
 
===Binding Fn keys with xbindkeys===
 
 
 
The following has been tested with KDE, but should also work for other DEs.
 
 
 
To bind the Fn keys to action, read [[Extra_Keyboard_Keys#The_quick_way]] and also [[Extra_Keyboard_Keys_in_Xorg#Using_your_Desktop_Environment_tools|Extra Keyboard Keys in Xorg]].
 
 
 
The suspend key (Fn+ESC) and disable touchpad (Fn+F10) keys, numlock, scroll lock,
 
volume controls and mute work out of the box.
 
 
 
Note, that suspend key is handled in {{ic|/etc/acpi/handler.sh}} (see "button/sleep" case entry) as
 
shown above.
 
 
 
1) install ''xbindkeys''
 
  pacman -S xbindkeys
 
 
 
2) check the key values with
 
  xbindkeys -mk
 
 
 
3) edit .xbindkeysrc
 
 
 
  "sudo /sbin/backlight up"
 
      m:0x0 + c:233
 
  "sudo /sbin/backlight down"
 
      m:0x0 + c:232
 
  "/home/user/bin/systeminfo_battery"
 
      m:0x0 + c:244
 
  "sudo /sbin/backlight toggle"
 
      m:0x0 + c:156
 
  "/home/user/bin/systeminfo_disk"
 
      m:0x0 + c:157
 
  "/home/user/bin/systeminfo_cpu"
 
      m:0x0 + c:210
 
  "/home/user/bin/systeminfo_wifi"
 
      m:0x0 + c:246
 
 
 
4) run xbindkeys, and try it out
 
xbindkeys
 
 
 
For KDE4 put a link to {{ic|/usr/bin/xbindkeys}} in {{ic|~/.kde4/Autostart}}
 
  ln -s /usr/bin/xbindkeys ~/.kde4/Autostart/xbindkeys.link
 
 
 
The Fn+F3 ("Euro") key: here Samsung implemented what has been called
 
an entertaingly hilarious hack:
 
http://lists.freedesktop.org/archives/hal/2009-August/013536.html
 
ROFL! Does anyone know a practical use for this key?
 
Fortunately some (eurozone) models have a real Euro key as well.
 
 
 
===Binding Fn keys in Openbox===
 
 
 
In [[Openbox]] one can use the internal keybind setup instead of xbindkeys.
 
Here is an excerpt from rc.xml:
 
 
 
<pre>
 
    <keybind key="XF86Battery">
 
      <action name="Execute">
 
        <command>~/.PersonalBin/batteryDisplay</command>
 
      </action>
 
    </keybind>
 
    <keybind key="XF86Display">
 
      <action name="Execute">
 
        <command>~/.PersonalBin/monitor</command>
 
      </action>
 
    </keybind>
 
    <keybind key="XF86Launch1">
 
      <action name="Execute">
 
        <command>~/.PersonalBin/brightnessToggle</command>
 
      </action>
 
    </keybind>
 
    <keybind key="XF86Launch2">
 
      <action name="Execute">
 
        <command>nice python ~/.config/openbox/scripts/checkmail.py --update</command>
 
      </action>
 
    </keybind>
 
    <keybind key="XF86Launch3">
 
      <action name="Execute">
 
        <command>~/.PersonalBin/powersaveToggle</command>
 
      </action>
 
    </keybind>
 
    </keybind>
 
    <keybind key="XF86AudioMute">
 
      <action name="Execute">
 
        <command>~/.PersonalBin/volume mute</command>
 
      </action>
 
    </keybind>
 
    <keybind key="XF86WLAN">
 
      <action name="Execute">
 
        <command>~/.PersonalBin/wlanToggle</command>
 
      </action>
 
    </keybind>
 
    <keybind key="XF86AudioLowerVolume">
 
      <action name="Execute">
 
        <command>~/.PersonalBin/volume -</command>
 
      </action>
 
    </keybind>
 
    <keybind key="XF86AudioRaiseVolume">
 
      <action name="Execute">
 
        <command>~/.PersonalBin/volume +</command>
 
      </action>
 
    </keybind>
 
    <keybind key="XF86MonBrightnessDown">
 
      <action name="PreviousWindow">
 
        <bar>no</bar>
 
        <allDesktops>yes</allDesktops>
 
        <finalactions>
 
          <action name="Focus"/>
 
          <action name="Raise"/>
 
        </finalactions>
 
      </action>
 
    </keybind>
 
    <keybind key="XF86MonBrightnessUp">
 
      <action name="NextWindow">
 
        <bar>no</bar>
 
        <allDesktops>yes</allDesktops>
 
        <finalactions>
 
          <action name="Focus"/>
 
          <action name="Raise"/>
 
        </finalactions>
 
      </action>
 
    </keybind>
 
</pre>
 
 
 
==Saving Power==
 
Read [[Laptop#Power_Management]]
 
 
 
Read [[Lightweight Applications]]
 
 
 
{{Note|Caution is advised here with hdparm settings because the issue with SATA freezing is
 
related to power management and spindowns. Before you tune the Samsung N130/N140 to minimize power consumption it is strongly recommended that you resolve the SATA freezing issue as discussed above.}}
 
 
 
The Samsung N130/N140 contains a 1.6 GHz Intel Atom ULV (ultra low voltage) N270 processor, designed for low power consumption. The power consumption of the netbook (not just the processor) can be as low as 6W on idle with HDD spun down, although a typical figure under normal usage would be considerably higher.
 
 
 
Obviously the battery life depends on battery capacity as well as power consumption.
 
The supplied battery varies in different markets. This list is a guideline only. Do not rely on this information before purchase -- check with YOUR vendor and update this wiki if it is incorrect:
 
<pre>
 
Voltage 11.1V
 
 
 
N130            = 4000mAh [44Wh] (most markets), 5200mAh [57Wh] (Sweden)
 
N130 (Vodafone)  = ? [?] (Spain)
 
N130 (CMCC)      = ? [?] (China)
 
N140            = 5200mAh [57Wh] (US, Germany, France, Sweden), 5900mAh [65Wh] (UK)
 
Extended battery = 7800mAh [86Wh]
 
</pre>
 
Install [[powertop]] which is a very useful tool for measuring and tuning power consumption, and htop which is useful for checking the CPU and memory usage of running processes
 
# pacman -S powertop htop
 
 
 
Enable CPU frequency scaling (P-states) by loading the driver module "acpi-cpufreq". This is most conveniently done in {{ic|/etc/rc.conf}}:
 
MODULES=(acpi-cpufreq ... )
 
Select the CPU frequency governor by adding the following lines to {{ic|/etc/rc.local}}:
 
# Set the CPU frequency scaling governor for each core
 
echo "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
 
echo "ondemand" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
 
 
 
{{Note|Contrary to the advice in many places "hdparm -B 255 /dev/sda" does NOT necessarily turn off advanced power management. What happens depends on the disk model. With the Samsung HM160HI disk 255 results in very frequent spindowns}}
 

Latest revision as of 22:34, 25 November 2017

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