Differences

This shows you the differences between two versions of the page.

--- tips_and_tricks [2012/02/13 20:53] – created paulf
+++ tips_and_tricks [2013/02/15 17:13] (current) – [Using side LEDs and WiFi LED] turbooster
@@ Line 1: / Line 1: @@
 ====== Tips and tricks ======
+===== Gordan's blog =====
+Plenty of inspirational tricks including screen upgrade, overclocking, installing additional internal storage and more can be found at http://www.altechnative.net/tag/ac100/.
+===== Optimising power consumption =====
+[[https://gitorious.org/powertop-for-arm|PowerTOP for ARM]] might provide more relevant information than the version from the distribution's repositories.
 ===== Lid and jack insertion events =====
 You can use a lightweight https://github.com/gandro/input-event-daemon, it should listen on ''/dev/input/event4'' for ''LID:0'' and ''LID:1'' events.
+===== Using side LEDs and WiFi LED =====
+(This is for the 12.04 kernel)
+The LEDs on the side can be triggered by echoing values between 0 and 7 to
+  echo 7 > /sys/devices/platform/nvec.0/nvec-leds.0/leds/nvec-led/brightness
+for different blinking-patterns (need to be root). Try
+  echo 0 > brightness ; sleep 1 ; echo 7 > brightness ; sleep .2;echo 1 > brightness
+to 'allways-on' the side LEDs
+You can also set different triggers for the WiFi LED. To see the available options do
+  cat /sys/devices/platform/nvec.0/leds-gpio/leds/wifi-led/trigger
+then to change the trigger (temporarily) do for example
+  echo mmc0 > /sys/devices/platform/nvec.0/leds-gpio/leds/wifi-led/trigger
+to get eMMC activity.
 ===== Video playback =====
@@ Line 71: / Line 92: @@
 ===== Wireless performance =====
-  * [[http://linuxwireless.org/en/users/Download|compat-wireless]] provides newer wireless drivers that work better but wireless extensions will not be enabled until the kernel is compiled with support for some old pre-mac80211 driver (to select ''CONFIG_WIRELESS_EXT'').
+  * [[http://linuxwireless.org/en/users/Download|compat-wireless]] provides newer wireless drivers that work better but wireless extensions (only needed for some specific programs using this deprecated interface, e.g. [[http://www.aircrack-ng.org/|aircrack-ng]]) will not be enabled until the kernel is compiled with support for some old pre-mac80211 driver (to select ''CONFIG_WIRELESS_EXT'').
   * ''iw dev wlan0 set power_save off'' to improve interactivity when a power-saving compatible AP is used
+===== Wireless connectivity without NetworkManager =====
+Place this in ''/etc/network/interfaces'' (on a Debian-like system) to have automatic wifi roaming controllable with wpa_cli and support for the GSM/UMTS modem:
+<code>
+# interfaces(5) file used by ifup(8) and ifdown(8)
+auto lo
+iface lo inet loopback
+allow-hotplug wlan0
+iface wlan0 inet manual
+        wpa-driver nl80211
+        wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
+iface default inet dhcp
+iface home inet dhcp
+iface wwan0 inet dhcp
+        pre-up stty -F /dev/ttyACM1 1:0:80001cb2:0:3:1c:7f:15:4:5:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0 2> /dev/null || \
+               stty -F /dev/ttyACM1 1:0:80001cb2:0:3:1c:7f:15:4:5:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0
+        pre-up chat -v TIMEOUT 30 ""                                    \
+                        AT OK                                           \
+                        AT+CGREG=1 OK                                   \
+                        AT+CFUN=1 "+CGREG: 1"-AT+CFUN=1-"+CGREG: 1"     \
+                        "" ABORT ERROR ""                               \
+                        AT*ENAPDBG=1 OK                                 \
+                        'AT+CGDCONT=1,"IP","internet.beeline.ru"' OK    \
+                        "AT*ENAP=1,1" "*ENAPDBG: 1,1"-"AT*ENAP=1,1"-"*ENAPDBG: 1,1" < /dev/ttyACM1 > /dev/ttyACM1 || \
+                                 ! chat -v "" AT*E2RESET < /dev/ttyACM1 > /dev/ttyACM1
+        post-down chat -v "" AT+CFUN=4 OK < /dev/ttyACM1 > /dev/ttyACM1
+</code>
+This assumes your card has PIN disabled, if it's not, you should be able to add ''AT+CPIN="abcde"'' command where appropriate. If you hot-swap the SIM card you might need to issue the ''AT*E2RESET'' command manually (or do ''ifup wwan0'' twice). The modem supports messaging via SMS and USSD requests, e.g. this works with Beeline to see the amount of money left:
+<code>
+#!/bin/sh
+/usr/sbin/chat -vs "" "AT+CUSD=1,\"*102#\",15" "OK" < /dev/ttyACM1 > /dev/ttyACM1
+</code>