Graphical corruption in system settings

[ad4m]

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