I've got a Dell Venue 11, 7130, with a fresh install of Windows 8.1. I've configured it not to sleep or hibernate, and disabled power management on USB ports. However, when the screen shuts off (Inactivity timeout, or I shut the 'lid' (When docked with it's keyboard), the USB port powers down (Verified with a USB power meter), and the USB device disconnects. It powers back up when the screen comes back on. My best guess is that this is a feature, either from Dell, or as part of tablet mode in Windows 8.1. The only way I could get it to NOT shut down the USB port was to uninstall the video driver. I've tried every video driver I could manage to install, but no difference. My best guess at this point is that the Video driver sends some kind of signal to the OS telling it the screen is off, and removing the driver simply keeps the OS, or whatever is shutting down the USB port, from knowing the screen is shut off.
Does anyone know how to disable this feature? Does anyone have this or another tablet that doesn't shut down the USB port when the screen shuts off?
UPDATE: I just got my hands on a Venue 11 5130, and the USB port stay on fine, as well as another Non-Dell tablet. Maybe this is a very weird hardware issue? Maybe an issue in the BIOS update I just did?
Does anyone know how to disable this feature? Does anyone have this or another tablet that doesn't shut down the USB port when the screen shuts off?
UPDATE: I just got my hands on a Venue 11 5130, and the USB port stay on fine, as well as another Non-Dell tablet. Maybe this is a very weird hardware issue? Maybe an issue in the BIOS update I just did?
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