desktop-packages team mailing list archive

[Rolf Leggewie <1174495@xxxxxxxxxxxxxxxxxx>]

saucy has seen the end of its life and is no longer receiving any
updates. Marking the saucy task for this ticket as "Won't Fix".

** Changed in: cogl (Ubuntu Saucy)
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1174495

Title:
  Window Managers instability with r600 radeon and high monitor
  resolutions

Status in Compiz:
  Fix Released
Status in Compiz 0.9.9 series:
  Fix Released
Status in Mesa:
  Fix Released
Status in cogl package in Ubuntu:
  Confirmed
Status in compiz package in Ubuntu:
  Fix Released
Status in kde-workspace package in Ubuntu:
  Fix Released
Status in mesa package in Ubuntu:
  Confirmed
Status in cogl source package in Raring:
  Won't Fix
Status in compiz source package in Raring:
  Fix Released
Status in kde-workspace source package in Raring:
  Fix Released
Status in cogl source package in Saucy:
  Won't Fix
Status in compiz source package in Saucy:
  Fix Released
Status in kde-workspace source package in Saucy:
  Fix Released

Bug description:
  [Impact]
  KWin 4.10.2 and Compiz 0.9.9 are using MSAA visuals with 13.04's mesa.
  This is unintended and leads to resource exhaustion which eventually crashes the WM.
  This affects all users on the r600 with sufficiently sized displays.

  [Test Case]
  Run Kwin or Unity with an r600 card, if it does not crash after a while we are happy.

  [Regression Potential]
  None, the fix was done by an upstream KWin and Mesa developer plus it has been incorporated into Fedora for a while plus it was used elsewhere in KWin already but not in this specific code path.

  [Other Info]
  None.

  --------------------------------------

  I think the version of kwin included in 13.04 contains a known bug as described here:
  https://bugs.kde.org/show_bug.cgi?id=315089
  https://bugs.freedesktop.org/show_bug.cgi?id=61182

  My understanding of the problem is as follows:
  * The Mesa radeon r600 driver recently added support for MSAA GLX visuals
  * Kwin isn't aware of MSAA properties and happens to (incorrectly) pick MSAA visuals for everything
  * These visuals occupy a large amount of memory when running at high monitor resolutions
  *  Mesa is "only" capable of mapping 256MB of visuals into CPU address space at once
  * Kwin's oversize visuals exceeds this limit, resulting in constant crashes

  The two radeon systems I have both crash immediately after logging in,
  when running with at a resolution of 2560x1440 and desktop effects
  enabled. After restarting kwin, a crash can be induced by performing
  actions that triggers desktop effects/animations. The resulting
  callstack is attached.

  ProblemType: BugDistroRelease: Ubuntu 13.04
  Package: kde-window-manager 4:4.10.2-0ubuntu2
  ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
  Uname: Linux 3.8.0-19-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  Date: Mon Apr 29 19:53:57 2013
  InstallationDate: Installed on 2013-04-27 (2 days ago)
  InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MarkForUpload: TrueSourcePackage: kde-workspace
  UpgradeStatus: No upgrade log present (probably fresh install)

  --------------------------------------

  Compiz (unity) is affected by the same issue as shown in this
  stacktrace:

  http://paste.ubuntu.com/5661055/

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