Also broken: rendercheck -t composite -o add -f a8r8g8b8,a8

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https://bugs.launchpad.net/bugs/1670945

Title:
  rendercheck claims that 'blend' 'add' operation renders incorrectly

Status in xserver-xorg-video-intel package in Ubuntu:
  New

Bug description:
  $ rendercheck -o add -t blend
  ...
  Beginning Add blend test on b8g8r8a8
  Add blend test error of 64.0000 at (0, 0) --
             R    G    B    A
  got:       0.00 0.00 0.00 1.00
  expected:  1.00 1.00 1.00 1.00
  src color: 0.00 0.00 0.00 1.00 (a8)
  dst color: 1.00 1.00 1.00 1.00
  src: 1x1R a8, dst: b8g8r8a8
  Add blend test error of 64.0000 at (0, 0) --
             R    G    B    A
  got:       0.00 0.00 0.00 1.00
  expected:  1.00 1.00 1.00 1.00
  src color: 0.00 0.00 0.00 1.00 (a8)
  dst color: 1.00 1.00 1.00 1.00
  src: 1x1R a8, dst: b8g8r8a8
  Add blend test error of 64.0000 at (0, 0) --
             R    G    B    A
  got:       0.00 0.00 0.00 1.00
  expected:  1.00 1.00 1.00 1.00
  src color: 0.00 0.00 0.00 1.00 (a8)
  dst color: 1.00 1.00 1.00 1.00
  src: 1x1R a8, dst: b8g8r8a8
  Add blend test error of 64.0000 at (0, 0) --
             R    G    B    A
  got:       0.00 0.00 0.00 1.00
  expected:  1.00 1.00 1.00 1.00
  src color: 0.00 0.00 0.00 1.00 (a8)
  dst color: 1.00 1.00 1.00 1.00
  src: 1x1R a8, dst: b8g8r8a8
  Add blend test error of 64.0000 at (0, 0) --
             R    G    B    A
  got:       0.00 0.00 0.00 1.00
  expected:  1.00 1.00 1.00 1.00
  src color: 0.00 0.00 0.00 1.00 (a8)
  dst color: 1.00 1.00 1.00 1.00
  src: 1x1R a8, dst: b8g8r8a8
  Add blend test error of 64.0000 at (0, 0) --
             R    G    B    A
  got:       0.00 0.00 0.00 1.00
  expected:  1.00 1.00 1.00 1.00
  src color: 0.00 0.00 0.00 1.00 (a8)
  dst color: 1.00 1.00 1.00 1.00
  src: 1x1R a8, dst: b8g8r8a8
  Add blend test error of 64.0000 at (0, 0) --
  ...

  $ cat /etc/X11/xorg.conf.d/20-intel.conf
  Section "Device"
   Identifier "Intel Graphics"
   Driver "intel"
   Option "XvPreferOverlay" "false"
   Option "VSync" "false"
   Option "TripleBuffer" "false"
   Option "TearFree" "true"
  EndSection

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1.2
  ProcVersionSignature: Ubuntu 4.8.0-39.42~16.04.1-lowlatency 4.8.17
  Uname: Linux 4.8.0-39-lowlatency x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  BootLog: system: clean, 442787/1933312 files, 3477778/7721472 blocks
  CompizPlugins: 
[core,composite,opengl,decor,compiztoolbox,mousepoll,move,resize,gnomecompat,wall,imgpng,vpswitch,place,snap,grid,dbus,regex,resizeinfo,session,unitymtgrabhandles,animation,expo,ezoom,fade,scale,workarounds,unityshell]
  CompositorRunning: None
  CurrentDesktop: MATE
  Date: Wed Mar  8 08:08:24 2017
  DistUpgraded: 2016-11-14 12:59:58,597 ERROR SystemError from cache.commit(): 
installArchives() failed
  DistroCodename: xenial
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller 
[8086:0162] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. P8 series motherboard [1043:84ca]
  InstallationDate: Installed on 2009-10-08 (2707 days ago)
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Alpha amd64 (20091008)
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-39-lowlatency 
root=UUID=23b87e6c-20b4-4242-9489-1599d62abcce ro 
resume=UUID=fb90e965-920d-4276-85b4-e0b72c4b0a6b delayacct quiet splash 
vt.handoff=7
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: Upgraded to xenial on 2016-11-14 (113 days ago)
  dmi.bios.date: 08/20/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1401
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8H77-M PRO
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1401:bd08/20/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8H77-MPRO:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Tue Mar  7 22:07:09 2017
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.18.4-0ubuntu0.2

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