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====== FAQ, Frequently Asked Questions ======

===== General questions =====

== What is recovery mode? ==
Recovery mode enables you to manipulate data on internal eMMC flash from other computer via the mini USB port.  In order to get into recovery mode you should hold Ctrl+ESC keys while pressing Power during boot.  The screen will stay black -- that's OK.

== What is SOS partition? ==
SOS partition is used by Android 2.1.  SOS partition contains an alternate boot image that does factory reset.  To boot from SOS you should hold Home key while booting and select "1" at bootloader's menu.

Android 2.2 doesn't use SOS partition.  It is not possible to boot from SOS with a bootloader from Android 2.2.

== How can I dual-boot? ==
To make your AC100 dual-boot into Android and Linux you just need to flash one kernel in LNX partition and other in SOS.

== How to check battery level? ==
<code>
cat /sys/class/power_supply/battery/charge_{now,full}
</code>

== How to change LCD brightness? ==
<code>
echo 100 > /sys/class/backlight/pwm-backlight/brightness
</code>

Screen goes completely black for any values less than 2.

See [[Backlightcontrol|here]] for some handy scripts.

== How to set up sound from speakers? ==
1. run audio playback

2. start alsamixer

3. remove mute state for all elements

4. set "SpeakerOut Mux" to value "Speaker Mix"
NOTE: some people get sound from speakers only when "SpeakerOut Mux" is set to "HPOut Mix"

5. enjoy

===== phh's 2.6.32 kernel =====

== Which bootloader version do I need? ==
For 2.6.32 bootloader from Android 2.2 is needed.

== Why does my disk fill up, it does not help if I remove files? ==
If you are using Nilfs2 as filesystem you need to make sure nilfs_cleanerd is running, if it's not running the disk will keep filling even when you delete files. You may need to install nilfs2-tools and reboot / remount the partition.
If you end up with a full partition you do not have any possibility to install nilfs2-tools it still possible to clean it, if you installed on SD-card just move it to another computer with nilfs2-tools and make sure nilfs_cleanerd is running. If you installed on internal emmc you will need to install a distribution on SD card and from there mount and clean the internal emmc.

===== 2.6.37 and above kernels =====

== Which bootloader version do I need? ==
For 2.6.37 bootloader from both Android 2.1 and Android 2.2 works fine.
However it is reported that only Android 2.1 bootloader does resume correctly after standby.

== I get error "init keyboard error EcOpen error" at boot ==
Remove battery and AC-cable, wait 20 seconds and then boot again. Make sure you are running the latest kernel.

== .37 installer of ubuntu fails ==
When following [[http://people.canonical.com/~ogra/tegra/README|this guide]] the installation fails if you have a certain emmc model (sandisk) due to a kernel bug. Models 10Z and 10D are known to fail due to this issue. This bug is fixed in .38 and later. You can still install .37 to a external USB stick or SD card.

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