CommonInfrastructure-12.04.3

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 * Hibernate (suspend to disk) has been disabled by default, as it was found to be unreliable, very slow, and confusing to have two suspend modes. See bug Bug:812394 for details. If you want to re-enable it, please [[http://askubuntu.com/questions/94754/how-to-modify-policykit-to-allow-hibernation-in-upower|follow this recipe]].

New Features

Common Infrastructure

  • Until Ubuntu 11.10, the Unix group for administrators with root privileges through sudo had been admin. Starting with Ubuntu 12.04 LTS, it is now sudo, for compatibility with Debian and sudo itself. However, for backwards compatibility, admin group members are still recognized as administrators.

  • Hibernate (suspend to disk) has been disabled by default, as it was found to be unreliable, very slow, and confusing to have two suspend modes. See bug 812394 for details. If you want to re-enable it, please follow this recipe.

  • Automatic Apport crash reporting has been enabled by default again to catch problems early on. It now checks for duplicates on the client side, which will avoid uploading debug data and creating Launchpad bug reports unnecessarily in many cases now.
  • pm-utils now has two new scripts to power down USB and various PCI devices in battery mode. A number of desktop packages were fixed to wake up less often. Both of this reduces power consumption and thus battery lifetime.
  • DNS resolution is now done through dnsmasq, which should help split-DNS VPNs and faster DNS resolution.

  • resolvconf is now used to manage /etc/resolv.conf on all Ubuntu systems. For systems using Network Manager DNS resolution is now done through dnsmasq, which should help split-DNS VPNs and faster DNS resolution. You can learn more here

Linux 3.2.12 Kernel

  • 12.04 ships with the 3.2.0-23.36 Ubuntu kernel which is based on the v3.2.12 upstream stable linux kernel. Key changes since the v3.0 linux shipped in 11.10 Ubuntu release include:

    • The amd64 -server and -generic kernel flavors have been merged to help reduce the maintenance burden over the life of this LTS release.
    • Non-smp flavor of PowerPC kernel has been removed.
    • anyone needing AUFS is encouraged to migrate to overlayfs.
    • RC6 is enabled by default for Sandy Bridge systems. RC6 is a technology which allows the GPU to go into a very low power consumption state when the GPU is idle (down to 0W). It results in considerable power savings when this stage is activated. When comparing under idle loads with machine state where RC6 is disabled, improved power usage of around 40-60% has been witnessed.

    • We've backported an improved set of jack detection patches from the upstream v3.3 kernel.

    • A set of kexec fixes for arm from v3.3-rc1 have also been backported.

    • We've also conducted an extensive review of Ubuntu kernel configs and made numerous config changes as a result.

Known Issues

Boot, Installation and Post-Installation

Upgrades

  • Aptitude does not work on 64 bit systems without disabling multiarch in /etc/dpkg/dpkg.cfg.d/multiarch . (831768)

  • If you have i386 packages installed an an amd64 system in Ubuntu 11.10, it is strongly recommended that you install the versions of apt and dpkg from oneiric-updates before upgrading. A number of multiarch-affecting upgrade issues have been fixed in those versions. (850264, 902603)

Kernel

  • On ARM omap imagesd the networking support for the Beagle XM board is broken (838200)

PrecisePangolin/ReleaseNotes/CommonInfrastructure-12.04.3 (last edited 2014-02-03 17:48:30 by 82-69-40-219)