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[Bug 1393024] Re: Graphical corruption with hidpi scaling

 

Looks like a propagating roundoff error in the underlying floating point
math.

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https://bugs.launchpad.net/bugs/1393024

Title:
  Graphical corruption with hidpi scaling

Status in Unity:
  Incomplete
Status in unity package in Ubuntu:
  Incomplete

Bug description:
  With a hidpi scaling greater or equal than 2 there is graphical
  corruption of the window borders in gtk3 apps.

  Steps to reproduce:

  1. Set hidpi scaling to 2.
  2. Enlarge a window for nautilus or eye of gnome. Probably it is necessary to do resize the window more than one time to spot the problem.
  3. See corrupted window border on the right and/or the bottom.

  Expected behavior:
  Clean rendering

  Ubuntu 14.10 64 Bit
  Compiz 0.9.12+14.10.20140918-0ubuntu1
  Unity 7.3.1+14.10.20141016-0ubuntu1

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: unity 7.3.1+14.10.20141016-0ubuntu1
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  Uname: Linux 3.16.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Ist ein Verzeichnis: '/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  331.89  Tue Jul  1 13:30:18 PDT 2014
   GCC version:  gcc version 4.9.1 (Ubuntu 4.9.1-16ubuntu6)
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sat Nov 15 16:36:40 2014
  DistUpgraded: Fresh install
  DistroCodename: utopic
  DistroVariant: ubuntu
  GraphicsCard:
   NVIDIA Corporation GK106 [GeForce GTX 660] [10de:11c0] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd Device [1458:354e]
  InstallationDate: Installed on 2014-11-12 (2 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: Gigabyte Technology Co., Ltd. GA-990FXA-D3
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic root=UUID=2a652086-a4da-44ed-ae7f-7b994401ef8b ro quiet splash
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/30/2012
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F7
  dmi.board.name: GA-990FXA-D3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF7:bd05/30/2012:svnGigabyteTechnologyCo.,Ltd.:pnGA-990FXA-D3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-990FXA-D3:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-990FXA-D3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.0-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.0-0ubuntu3
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
  xserver.bootTime: Sat Nov 15 15:00:14 2014
  xserver.configfile: default
  xserver.errors: open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.16.0-1ubuntu1

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References