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[Wa Dev <wadev@xxxxxxxxxx>]

Not that this could be much of help, but this bug also exists on Debian 8 and 9, with Nouveau as well as the binary driver, on gdm3 (Gnome 3) too.
So this is definitely not a
- radeon
- nvidia
- binary driver
- open source driver
- intel
- amd
- compiz
- gnome shell
- unity
problem.

As much as I can postulate, it might be a problem with kernel vs Xorg?

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https://bugs.launchpad.net/bugs/1004475

Title:
  Slow graphics after resume from suspend

Status in Unity:
  Expired
Status in compiz package in Ubuntu:
  Expired
Status in unity package in Ubuntu:
  Expired

Bug description:
  When resume from suspend the desktop loads but Unity runs very slow.

  -------------------------------------------------------------------------------------
  General Info:

  -->lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 12.04 LTS
  Release:	12.04
  Codename:	precise

  -->uname -a
  Linux myBox 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

  -->apt-cache policy  unity
  unity:
    Installed: 5.12-0ubuntu1
    Candidate: 5.12-0ubuntu1
    Version table:
   *** 5.12-0ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       5.10.0-0ubuntu6 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

  -->apt-cache policy compiz
  compiz:
    Installed: 1:0.9.7.8-0ubuntu1
    Candidate: 1:0.9.7.8-0ubuntu1
    Version table:
   *** 1:0.9.7.8-0ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1:0.9.7.6-0ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

  -->dpkg -s Xorg | grep Version
  Version: 1:7.6+12ubuntu1

  -->glxinfo | grep OpenGL
  OpenGL vendor string: X.Org
  OpenGL renderer string: Gallium 0.4 on AMD JUNIPER
  OpenGL version string: 2.1 Mesa 8.0.2
  OpenGL shading language version string: 1.20

  -->lspci -nn | grep VGA
  01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Juniper [Radeon HD 5700 Series] [1002:68b8]

  Hardware
  Motherboard: Gigabyte GA-P55A-UD4P
  Processor: Intel Core i7-870 Processor
  Graphics: Gigabyte ATI Radeon HD 5770 GV-R577UD-1GD (Batmobile)
  Memory: 16GB (4 x 4GB) G.SKILL Ripjaws Series 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) F3-12800CL9D-8GBRL
  SSD Drive: Crucial 64GB m4 2.5-inch SATA 6GB/s
  Monitor: 2x Samsung P2770

  Discussion link:
  http://ubuntuforums.org/showthread.php?p=11962793#post11962793
  -------------------------------------------------------------------------------------

  Fresh boot; before suspend
  -->glxgears
  Running synchronized to the vertical refresh. The framerate should be
  approximately the same as the monitor refresh rate.
  303 frames in 5.0 seconds = 60.440 FPS
  300 frames in 5.0 seconds = 59.968 FPS
  300 frames in 5.0 seconds = 59.966 FPS
  300 frames in 5.0 seconds = 59.970 FPS
  300 frames in 5.0 seconds = 59.967 FPS
  300 frames in 5.0 seconds = 59.968 FPS

  After suspend
  -->glxgears
  Running synchronized to the vertical refresh. The framerate should be
  approximately the same as the monitor refresh rate.
  188 frames in 5.0 seconds = 37.560 FPS
  194 frames in 5.0 seconds = 38.670 FPS
  196 frames in 5.0 seconds = 39.068 FPS
  198 frames in 5.0 seconds = 39.599 FPS
  201 frames in 5.0 seconds = 40.198 FPS
  200 frames in 5.0 seconds = 39.868 FPS

  After compiz --replace
  -->glxgears
  Running synchronized to the vertical refresh. The framerate should be
  approximately the same as the monitor refresh rate.
  303 frames in 5.0 seconds = 60.457 FPS
  299 frames in 5.0 seconds = 59.797 FPS
  300 frames in 5.0 seconds = 59.997 FPS
  300 frames in 5.0 seconds = 59.999 FPS
  300 frames in 5.0 seconds = 59.998 FPS
  300 frames in 5.0 seconds = 59.998 FPS
  300 frames in 5.0 seconds = 59.998 FPS
  299 frames in 5.0 seconds = 59.798 FPS

  It doesn't look like it is only affecting Launcher performance when
  suspend was used. I'm not sure if this would be a separate issue so
  decided to include it here for now. Here is some more details.

  Fresh boot; suspend not used
  At first all looks good. Launcher opens and closes quickly but after few minutes of regular use I can see performance degradation when using Launcher. Everything else still works good.

  -->glxgears
  Running synchronized to the vertical refresh. The framerate should be
  approximately the same as the monitor refresh rate.
  302 frames in 5.0 seconds = 60.245 FPS<= Launcher closed
  299 frames in 5.0 seconds = 59.798 FPS
  301 frames in 5.0 seconds = 60.002 FPS
  298 frames in 5.0 seconds = 59.596 FPS
  299 frames in 5.0 seconds = 59.799 FPS
  102 frames in 5.1 seconds = 20.030 FPS<= pressing “Super”; Launcher slowly opens
  30 frames in 5.2 seconds = 5.780 FPS
  30 frames in 5.2 seconds = 5.759 FPS
  30 frames in 5.2 seconds = 5.780 FPS
  31 frames in 5.2 seconds = 5.962 FPS
  32 frames in 5.2 seconds = 6.172 FPS
  31 frames in 5.2 seconds = 5.984 FPS
  30 frames in 5.2 seconds = 5.788 FPS
  105 frames in 5.0 seconds = 20.984 FPS<= pressing ESC; Launcher slowly closes
  299 frames in 5.0 seconds = 59.600 FPS
  299 frames in 5.0 seconds = 59.600 FPS
  298 frames in 5.0 seconds = 59.595 FPS
  301 frames in 5.0 seconds = 60.001 FPS
  300 frames in 5.0 seconds = 59.996 FPS
  293 frames in 5.0 seconds = 58.597 FPS
  49 frames in 5.2 seconds = 9.438 FPS<= pressing “Super”; Launcher slowly opens
  31 frames in 5.2 seconds = 5.961 FPS
  34 frames in 5.2 seconds = 6.529 FPS
  30 frames in 5.2 seconds = 5.791 FPS
  29 frames in 5.2 seconds = 5.595 FPS
  33 frames in 5.2 seconds = 6.305 FPS
  105 frames in 5.0 seconds = 20.984 FPS<= pressing ESC; Launcher slowly closes
  299 frames in 5.0 seconds = 59.799 FPS
  300 frames in 5.0 seconds = 59.998 FPS
  298 frames in 5.0 seconds = 59.599 FPS
  300 frames in 5.0 seconds = 59.996 FPS

  Everything seems to be very slow when Launcher is open and comes back
  to normal after Launcher is closed.

  Replacing compiz windows:
  -->compiz --replace

  -->glxgears
  Running synchronized to the vertical refresh. The framerate should be
  approximately the same as the monitor refresh rate.
  303 frames in 5.0 seconds = 60.494 FPS<= Launcher closed
  298 frames in 5.0 seconds = 59.598 FPS
  299 frames in 5.0 seconds = 59.797 FPS
  291 frames in 5.0 seconds = 58.199 FPS<= pressing “Super”; Launcher quickly opens
  299 frames in 5.0 seconds = 59.799 FPS
  298 frames in 5.0 seconds = 59.515 FPS
  299 frames in 5.0 seconds = 59.679 FPS
  300 frames in 5.0 seconds = 59.999 FPS<= pressing ESC; Launcher quickly closes
  299 frames in 5.0 seconds = 59.798 FPS
  297 frames in 5.0 seconds = 59.315 FPS
  298 frames in 5.0 seconds = 59.395 FPS
  297 frames in 5.0 seconds = 59.399 FPS<= pressing “Super”; Launcher quickly opens
  296 frames in 5.0 seconds = 59.089 FPS

  This will work good for some time (10 maybe 20 minutes) and will go
  back to degraded performance again.

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