Happens to me too, not every time but a bit too often. Ubuntu 15.10
64-bit up to date. nvidia driver 340.96. Using two screens (laptop's own
and external display via displayport). HW:
01:00.0 VGA compatible controller: NVIDIA Corporation G98M [Quadro NVS 160M]
(rev a1) (prog-if 00 [VGA controller])
Subsystem: Dell Device 0233
Flags: bus master, fast devsel, latency 0, IRQ 33
Memory at f5000000 (32-bit, non-prefetchable) [size=16M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
Memory at f2000000 (64-bit, non-prefetchable) [size=32M]
I/O ports at df00 [size=128]
[virtual] Expansion ROM at f4000000 [disabled] [size=128K]
Capabilities: [60] Power Management version 3
Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [78] Express Endpoint, MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [128] Power Budgeting <?>
Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024
<?>
Kernel driver in use: nvidia
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https://bugs.launchpad.net/bugs/1292830
Title:
Resuming from sleep makes black borders around windows to appear
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