T400 screen dims when AC attached

I have a T400 ThinkPad that is 2 months old. Today the screen went dim. I was running with the AC Adaptor plugged in. I removed the AC adaptor and the screen returned to normal brightness. Any ideas?

deepitm wrote:
I have a T400 ThinkPad that is 2 months old. Today the screen went dim. I was running with the AC Adaptor plugged in. I removed the AC adaptor and the screen returned to normal brightness. Any ideas?
I would check your power profile and make sure that the brightness while running on AC is an acceptable level. Can you turn the brightness up with the brightness hotkeys?
Thinkpad T500-2081 CTO | T9400 2.53GHz | 8 GB RAM | ATI HD3650 + Intel GM45 | 15.4" LED WXGA+ | Windows 8 | ATI Catalyst 13.1 (non-switchable)
Thinkpad 390x | PII 333 | 256mb ram | NeoMagic 256AV | SVGA LCD | OS/2 v4.52

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T400 screen dims when AC attached

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