I can confirm both oddities mentioned here:
* screen visible upon unlock
* password box remains on screen after unlock
Both issues go away when disabling compositing.
This is
[ 187.843] (II) AMD Proprietary Linux Driver Version Identifier:9.00.2
[ 187.843] (II) AMD Proprietary Linux Driver Release Identifier: 9.002
[ 187.844] (II) AMD Proprietary Linux Driver Build Date: Sep 28 2012 15:32:36
...
[ 189.301] (--) fglrx(0): Chipset: "AMD Radeon HD 6310 Graphics" (Chipset =
0x9802)
[ 189.301] (--) fglrx(0): (PciSubVendor = 0x17aa, PciSubDevice = 0x21df)
a AMD E-350 APU (Brazos).
KDE is at 4.9.5, a Kubuntu 12.04.1 LTS system, Kwin is also at 4.9.5.
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https://bugs.launchpad.net/bugs/474654
Title:
[SecurityRoadmap] Desktop visible when screen is locked in Kubuntu
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