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[Fran Diéguez <1364629@xxxxxxxxxxxxxxxxxx>]

I've been doing Kernel Bisection and here are the results:

 Meanings:
 - OK: the kernel works ok, no regression
 - FAILED: the kernel has the regression and DE and scrolling run with poor performance.

Kernels:

linux-image-3.13.11-03131106-generic	OK
linux-image-3.14.17-031417-generic		OK
linux-image-3.15.10-031510-generic		OK
linux-image-3.16.0-12-generic			FAILED
linux-image-3.17-rc3-generic			        FAILED
 
Seems to be related with a radeon kernel module rewrite or refactor in version 3.16.

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https://bugs.launchpad.net/bugs/1364629

Title:
  Desktop environment particularly slow while using radeon driver

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  GNOME Shell and sublime-text, particularly when doing scrolls are really slow.
  While using 3.13 version this slowness is not reproducible.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-12-generic 3.16.0-12.18
  ProcVersionSignature: Ubuntu 3.16.0-12.18-generic 3.16.1
  Uname: Linux 3.16.0-12-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.7-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  fran       2728 F.... pulseaudio
   /dev/snd/controlC1:  fran       2728 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Tue Sep  2 23:08:46 2014
  InstallationDate: Installed on 2013-10-31 (306 days ago)
  InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Release amd64 (20131017)
  MachineType: Apple Inc. MacBookPro8,2
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-12-generic root=UUID=dc72a6ab-bd38-4a3e-ad02-39353a4c68b3 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-12-generic N/A
   linux-backports-modules-3.16.0-12-generic  N/A
   linux-firmware                             1.133
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2014-08-20 (12 days ago)
  WifiSyslog:
   
  dmi.bios.date: 01/24/12
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP81.88Z.0047.B27.1201241646
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-94245A3940C91C80
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro8,2
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-94245A3940C91C80
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B27.1201241646:bd01/24/12:svnAppleInc.:pnMacBookPro8,2:pvr1.0:rvnAppleInc.:rnMac-94245A3940C91C80:rvrMacBookPro8,2:cvnAppleInc.:ct10:cvrMac-94245A3940C91C80:
  dmi.product.name: MacBookPro8,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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