Curious effect of plugging in AC power

Hi
I have a Lenovo Thinkpad T510
I am experiencing a curious problem. Video runs perfectly with the power cable unplugged, but when I plug it in it becomes very jerky. The problem is not merely video playback, but, for example, scrolling in web browsers and transitional windows effects are also jerky.
I have tried the following:
Checked the power management settings - the problem remains even though the power settings for battery and AC are identical
- reinstalled the graphics driver. The version I installed is that in the Lenovo downloads section, version 268.24. for Nvidia NVS 3100M
reinstalled the power manager
Nothing seems to change the problem.
Any ideas?
Below is a dump of the system information.
Many thanks
Roland
OS NameMicrosoft Windows 7 Ultimate
Version6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS ManufacturerMicrosoft Corporation
System NameFRUITCAKE
System ManufacturerLENOVO
System Model4313CTO
System Typex64-based PC
ProcessorIntel(R) Core(TM) i7 CPU M 620 @ 2.67GHz, 2667 Mhz, 2 Core(s), 4 Logical Processor(s)
BIOS Version/DateLENOVO 6MET87WW (1.47 ), 14/07/2011
SMBIOS Version2.6
Windows DirectoryC:\Windows
System DirectoryC:\Windows\system32
Boot Device\Device\HarddiskVolume1
LocaleUnited Kingdom
Hardware Abstraction LayerVersion = "6.1.7601.17514"
User NameFRUITCAKE\Fruitcake
Time ZoneGMT Standard Time
Installed Physical Memory (RAM)8.00 GB
Total Physical Memory7.86 GB
Available Physical Memory5.64 GB
Total Virtual Memory15.7 GB
Available Virtual Memory13.2 GB
Page File Space7.86 GB
Page FileC:\pagefile.sys

Hi conicsection and welcome to the Community,
How does it run on just the ac adapter with no battery?
Also, how many watts is your ac adapter?
Dave
T430u, x301, x200T, x61T, x61, x32, x41T, x40, U160, ThinkPad Tablet 1838-22R, Z500 touch, Yoga Tab 2 Windows 8.1, Yoga Tablet 3 Pro
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