Mh I don't see any triangle or any difference when I do this.

On TTY1 I get something like
"libEGL: warning unsupported platform (null)"

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1233545

Title:
  XMir screen corruption on radeon chipset

Status in Mir:
  Incomplete
Status in Unity System Compositor:
  Incomplete
Status in “xserver-xorg-video-ati” package in Ubuntu:
  Confirmed

Bug description:
  See the attached video. Happens on my Thinkpad Edge with radeon graphics card.
  --- 
  ApportVersion: 2.12.5-0ubuntu1
  Architecture: amd64
  DistroRelease: Ubuntu 13.10
  EcryptfsInUse: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] RS880M [Mobility Radeon HD 4225/4250] 
[1002:9712] (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:21c6]
  InstallationDate: Installed on 2011-05-12 (872 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MarkForUpload: True
  Package: unity-system-compositor 0.0.1+13.10.20130926.1-0ubuntu1
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 3.11.0-9.16-generic 3.11.2
  Tags:  saucy
  Uname: Linux 3.11.0-9-generic x86_64
  UnitySystemCompositorLog: ** (lightdm:1376): WARNING **: Error executing 
child process unity-system-compositor.sleep: No such file or directory
  UnitySystemCompositorLogOld: ** (lightdm:1377): WARNING **: Error executing 
child process unity-system-compositor.sleep: No such file or directory
  UpgradeStatus: Upgraded to saucy on 2013-06-05 (117 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  version.libdrm: libdrm2 2.4.46-1
  version.lightdm: lightdm 1.7.17-0ubuntu1
  version.mesa: libegl1-mesa-dev N/A

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