I have a Dell ‘gaming’ laptop, the Inspiron 7567. It’s about 2 years old now, and while the laptop works fine, I’ve been having an issue with the charger (and a backup charger left over from a Precision M6600.) Both chargers will keep the laptop running when plugged in, but refuse to charge the battery in Windows. What’s interesting about this, is that both chargers will top off the battery in Ubuntu.
Researching this a little further, it appears that Dell actually embeds a chip in the PSU that tells the laptop and Windows what the wattage of the PSU is. If it doesn’t recognize the adapter, or the adapter doesn’t provide enough power, the system can throttle or just not draw power from the adapter.
However, a pretty common occurrence is that the PSU works perfectly fine, but the chip malfunctions or loses connection to the laptop. Both of my chargers seem to work fine in Linux (no magic smoke has come out yet), so it possible to convince Windows to also ignore the absence of this chip and just charge the laptop?
UPDATE: Actually, Ubuntu isn’t charging the battery…it just says it is. Sigh. It’s looking like I’m going to have to fork over $75 to Dell for a frickin’ power brick.