en:c2_ubuntu_release_note_v2.3 [ODROID Wiki]

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====== Release Note of Ubuntu 16.04 LTS (v2.3) =====
----
===== Summary =====
|| Release Date | 2017-03-01 ||
|| Release Type | Update ||

**File name : ubuntu64-16.04.2lts-mate-odroid-c2-20170301.img.xz**

**Note: OS will reboot on the first boot for automatic rootfs resize**

===== New updates =====
  * Official US West Coast: [[http://odroid.in/ubuntu_16.04lts]]
  * Official US East Coast: [[http://east.us.odroid.in/ubuntu_16.04lts]] (Thanks to David Beauchamp @ ArchLinuxARM)
  * Official EU Germany: [[http://de.eu.odroid.in/ubuntu_16.04lts]]
  * Official Korea Mirror: [[http://dn.odroid.com/S905/Ubuntu]]


==== Kernel Updates ====
  * GPIO Wakeup Feature [[en:c2_gpio_key_wakeup|Power Off and Wake Up using GPIO Key Button]] 
  * GPIO Mem driver is implemented to support the [[en:gpiomem|Rootless GPIO access: /dev/gpiomem]]

==== U-Boot Updates ====
  * Display Auto Detection [[en:c2_auto_detect_display|Display Auto Detection using EDID]]
  * GPIO Wakeup Feature [[en:c2_gpio_key_wakeup|Power Off and Wake Up using GPIO Key Button]] 
  * New dvfs table scheme to support [[http://forum.odroid.com/viewtopic.php?f=141&t=23044&start=300#p179945|Mainline Kernel development]]
==== Userspace Update ====
  * Kodi to 17.0
  * libcec to 4.0
  * Ubuntu to 16.04.2


===== Tips and Known issues =====
  * mySQL/KVM needs an editing of boot.ini file to change the system timer source to ARMv8 Architecture from the Meson. But the ARMv8 timer affects the VPU/GPU system accuracy.
  * NTP time syncing takes long time (sometimes around 1~2 minutes)
  * GPU acceleration should be enabled manually. Add below line into /etc/chromium-browser/default file.<code>CHROMIUM_FLAGS=" --use-gl=egl --ignore-gpu-blacklist --disable-accelerated-2d-canvas --num-raster-threads=2"</code>
  * The root file system will be resized in the first booting process. OS will reboot automatically to complete the resizing process. **This process must not be interrupted.**
  * To enable Auto-login, edit /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf file like this. <code>
[Seat:*]
greeter-session=lightdm-gtk-greeter
autologin-user=odroid </code>


===== Reverting to Kodi 16.1 =====
  * If Kodi 17 isn't working fine for you, you can revert to 16.1 with the following steps. <code>wget deb.odroid.in/old_kodi_c2/old_kodi.tar
tar xf old_kodi.tar
sudo dpkg -i *.deb</code>


===== How to update the kernel and system =====
  * <code>sudo apt update && sudo apt upgrade && sudo apt dist-upgrade </code>
  * <code>sudo apt install linux-image-c2</code>

===== The default boot.ini in V2.3 =====
  * Available here: https://github.com/mdrjr/c2_bootini/blob/master/boot.ini

===== How to checkout =====
The current version only provide Linux kernel and U-boot source code. Here are the instructions to checkout the source code and build. For more detail information, please visit [[en:c2_building_u-boot|U-boot]] and [[en:c2_building_kernel|Kernel]].

**This guide is only for the NATIVE BUILD.**
==== U-boot ====
<code>
$ git clone https://github.com/hardkernel/u-boot.git -b odroidc2-v2015.01
$ cd u-boot
$ make odroidc2_config
$ make
</code>
==== Linux Kernel ====
<code>
$ git clone --depth 1 https://github.com/hardkernel/linux -b odroidc2-3.14.y
$ cd linux
$ make odroidc2_defconfig
$ make -j5
$ sudo make modules_install
$ sudo cp arch/arm64/boot/Image /media/boot
$ sudo cp arch/arm64/boot/dts/meson64_odroidc2.dtb /media/boot
</code>

Run "**git checkout jenkins-deb_s905_kernel-102**" command to use the same kernel tag before "make odroidc2_defconfig".
===== Kodi Tips =====
  * [[c2_adjust_display_refresh_rate|Enabling Adjust Display Refresh Rate]]
  * [[c2_hdmi_passthrough|Enabling HDMI passthrough]]