![]() ![]() If you are installing a fresh instance of Ubuntu Mate, I recommend to just upgrade the BIOS, if needed (I describe that procedure below) and skip installing TLP. I observed that power management worked properly after re-installing Ubuntu Mate. After writing this post, I decided to delete my disks and re-install Ubuntu Mate. ![]() In his post, I describe how to install and configure TLP and how to upgrade the BIOS on a Lenovo Thinkpad T420. Also, for good measure, I upgraded the BIOS because, while troubleshooting this issue, I discovered is was very out of date. I installed Linux Advanced Power Management, TLP. When running on the battery, the laptop would suddenly lose power after only 10 minutes, even when the battery still shows ninety percent charge. ![]() However, the upgrade seemed to break the power management on my laptop. Select Exit and Save Changes then click Enter, select YES and click Enter.I upgraded my T420 because Ubuntu Mate 19.10 now supports the Nvidia Optimus drivers and includes a utility that lets me switch between Intel and Nvidia graphics cards.Select Load Setup Default - click Enter, select YES and click Enter. Inside the BIOS Set Up, navigate to the Exit Menu.Navigate and select using the arrow keys to BIOS Set Up. Access/click this by using an unfolded paperclip or by using something similar to the latter.Make sure that the machine is properly powered down/switched off.Press and hold down the power button for as long as 60 seconds to drain flea power or excess voltage.Ensure that device is powered/switched off.power cable, hdmi cable, external mouse/keyboard, flashdrives, etc). Disconnect all cables and/or peripheral devices connected to the machine (ex.Make sure there is still remaining battery power, able to power up the machine.If same issue persist, please try to perform a static drain and load the BIOS to defaults: You should see a file labeled battery_report.html. ![]() Using Explorer navigate to C:\ aka the root directory.Put these in the blinking curse: "powercfg /batteryreport /output "C:\battery_report.html" into the command prompt window.Launch the command prompt, by typing "cmd" into the search bar, right-click the program showing up and then choose "Run as Administrator".Right-click on the Windows Icon in the bottom-left corner of desktop and select "Search".The following are steps in order to generate/initiate a Battery Report in Windows.Try to generate a battery report as well: Check if battery can exceed the percentage reported.Restart the device and the Windows itself will install the generic driver type for the battery to be installed.Go ahead and right-click the Microsoft ACPI-Compliant Control Method Battery and choose Uninstall from the menu.Click the Batteries section in the Device Manager window.You can go by pressing Windows Key X, then select Device Manager. Try to uninstall-reinstall battery drivers from Device Manager: If that doesn't work you can follow a procedure I found on the Lenovo forum: Power it off, unplug everything, remove the battery, wait a minute, put the battery back in, and plug it back in and boot it up.You can seek help from the retailer, if they are unhelpful then you can ask the Lenovo warranty support team. Since your machine is recently acquired, it is likely covered by warranty. ![]()
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