I have a problem with my T540p which has Windows 8.1 installed. A message window keeps popping up says that my power suppy has an issue. See the error message below:
It is impossible to use powerpoint, because the message pops up and/or the brightness is going down and up.
I'm using 135W power adapter.
Screen flickering or flashing while in a docked configuration may attributed to an issue with the dock that was resolved via a firmware update for the dock. See this KB article for details. If the config does not include a dock, or the firmware has already been applied, the symptoms may also be attributed to certain 135w AC adapters. a service tip has been released for service to help in identifying these particular AC adapters.
There may be other possible causes including the input socket on the laptop .
If you have isolated the issue to the 135 watt power supply by testing with other ThinkPad adapters including 90w, other 135w or 170w adapters and finding they produce normal results, please contact Lenovo support and reference support site tip HT082284.