My Dell Latitude E5510 running Windows 7, seemingly random disables the charger/adaptor. After unplugging the charger from the socket, waiting a few seconds and plugging it back in, it works fine (sometimes only for a few seconds, sometimes until fully charged).
This behaviour is not dependent on the adaptor (I tried a different Dell-adaptor) and is not displayed when the laptop is in sleep-mode or powered-off (it charges OK). I.e. the operating system/power management/... is actively disabling the charger (control-led on charger goes out).
Googeling on for this issue gives little help. A single post describes similar symptoms, with the diagnosis being that the charger was incorrectly seen by power management as a NIC, and disabled. No solution posted however.
Changing the power management settings however does not ameliorate the situation, and I do not know how to request a log of power management-related events on Windows.
Any suggestions on diagnosis/possible fixes are welcome.