[Bug 1171340] Re: Please update libdrm for lts-raring

[Maarten Lankhorst]

Works on pandaboard (armhf) precise too.

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Title:
  Please update libdrm for lts-raring

Status in “libdrm” package in Ubuntu:
  Invalid
Status in “libdrm” source package in Precise:
  Fix Committed
Status in “libdrm” source package in Quantal:
  Fix Committed

Bug description:
  [Impact]
   * libdrm versioning is a mess, and lying about the version will lead to all kinds of problems.
   * Changes between 2.4.39 in precise/quantal and 2.4.43:
     - some tiling changes for radeon SI and multisampled surfaces (SI support is not available on precise xserver, so this is harmless.)
     - Adding PCI ID's for newer chipsets on radeon.
     - Some fixes for intel, and adding support for newer chipsets.
     - A few small nouveau fixes, and adding support for selecting kepler engines
     - manpages no longer formatted with troff, using xml instead
     - adding support for freedreno (disabled in our package)
     - Exynos fixes (disabled too)
     - A small omap fix, which the pandaboard ppa already included.
   * Renaming libdrm hasn't worked correctly, it has been attempted before in LP #1086345
   * Lying about version numbers will break, there is a version in x-updates ppa that's the same version as quantal, so doing an upload with a version that's lower than what's available in quantal will break for anyone that followed the steam install instructions.
   * libdrm-nouveau1a should be patched in again, and re-enabled for precise and quantal.
     - plymouth needs this on quantal and precise
     - precise xserver and mesa require this, too

  [Test Case]
   * Testing should be performed on quantal, precise lts-quantal, and precise original stack, with intel, radeon and nouveau.
   * Plymouth should still work correctly on precise and quantal with all the 3 kinds of cards
   * system should boot correctly, xserver, compiz and opengl applications must still work.

  [Regression Potential]
   * I believe the regression potential is low, raring has been mostly on a stack similar to quantal for most of the release, with the bump to new mesa 9.1 only happening right
   before final freeze, so a lot of testing has already been done.
   * Old nouveau abi has not been tested however, with the plymouth update finally using the 'dumb' kms api instead of nouveau/intel/radeon directly.
   * The core libdrm api hasn't been changed however, libdrm-nouveau1a was only using that subset.
   * So if something breaks, it's likely going to be in a form similar to #1086345
   * It would be very unlikely to introduce new crashes in opengl applications, or xserver

  [Other Info]
   * Provisional MRE granted, for updating libdrm in quantal and precise to the raring version.

  [Original bug report]
  For the lts-raring backports stack libdrm needs to be backported to quantal and precise. While the API is stable and I haven't noticed any new bugs being introduced, I fear that bumping the version number to beyond what quantal provides will make upgrading to quantal harder. Unfortunately, I think this is the only solution.

  The ubuntu-x-swat/x-updates ppa was recommended to be enabled for steam, and was already providing a newer libdrm:
  https://launchpad.net/~ubuntu-x-swat/+archive/x-updates/+packages

  The only way out I see is removing libdrm from that ppa, pushing a
  newer libdrm version to precise, removing libdrm from that ppa, and
  make update-manager downgrade libdrm during an upgrade to quantal.

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