[Bug 1413911] [NEW] Graphical corruption in system settings

[/ADM]

Public bug reported:

Latest Kubuntu 15.04 alpha vivid
system-settings 5.1.95

1. Get to System Settings 
2. Observe the background and move/resize window.  Some faint corruption is visible (looks like mashed pixels).  Dolphin File Manager does not have this issue and neither do other areas I have tested.

Reproducible: Always (might be restricted to certain gpu chipsets)

Below is my GPU from lspci:

00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
        Subsystem: Lenovo Device [17aa:20e4]
        Flags: bus master, fast devsel, latency 0, IRQ 29
        Memory at f2000000 (64-bit, non-prefetchable) [size=4M]
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 1800 [size=8]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: <access denied>
        Kernel driver in use: i915

00:02.1 Display controller [0380]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a43] (rev 07)
        Subsystem: Lenovo Device [17aa:20e4]
        Flags: bus master, fast devsel, latency 0

** Affects: ubuntu-system-settings (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 5.1.95 kubuntu system-settings vivid

** Attachment added: "graphical_corruption_system_settings_window.png"
   https://bugs.launchpad.net/bugs/1413911/+attachment/4304123/+files/graphical_corruption_system_settings_window.png

** Package changed: ubiquity (Ubuntu) => ubuntu-system-settings (Ubuntu)

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https://bugs.launchpad.net/bugs/1413911

Title:
  Graphical corruption in system settings

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