Precision 7550 or 7750 users may experience that CPU will throttle to 1 GHz or lower (0.8 GHz frequently reported) when computer is attached to AC power source (Dock or power adapter) and battery is fully charged. System performance may be limited.
They may also notice that throttling does not occur when operating on battery or when battery is not fully charged.
Embedded Controller (EC) is placing computer into protection state.
Updating the latest BIOS version (1.8.1 or newer) on the computer helps resolve the issue. To download and install the latest BIOS:
WARNING: Dell recommends disconnecting any external devices such as external hard disk drives, printers, scanners, and so on (except keyboard and mouse) before updating the BIOS on a Dell computer.
WARNING: Dell laptops must have the battery installed and charged to at least 10% before you begin the BIOS update. Dell recommends connecting the laptop to the ac adapter before proceeding with the update process.
NOTE: To learn more about updating the BIOS on a Dell computer, see the Dell knowledge base article
Dell BIOS Updates.
- Browse to the Dell Drivers & downloads page.
- Select the Operating System.
- Under Category, select BIOS.
- Locate the latest System BIOS (1.8.1 or newer).
- Click Download and save the file to your computer.
- Open File Explorer and browse to the location where the downloaded file is saved.
- Double-click the BIOS setup file and follow the on-screen instructions to complete the installation process.