Why is it that certain generations of laptops or tablets can only be woken from sleep mode by using the power button?
Why is there no Deep Sleep Control feature in the BIOS of your system? (Even with no external connected devices (USB), the system onboard keyboard and touchpad can only be awoken from sleep with the power button.)
No cause information
This has everything to do with the USB Wake Support functionality of the following Dell systems:
(Table.1 USB Wake Support Functionality)
Systems with USB Wake Support Functionality | |||||||
---|---|---|---|---|---|---|---|
Inspiron | Vostro | XPS | XPS Desktop |
Latitude | OptiPlex | Precision Mobile |
Precision Workstation |
14" 7472 | 13" 5370 | 15" 9560 | 27" 7760 AIO | 12" 7285 | 5050 | 15" 5520 | 5720 AIO |
15" 7572 | 14" 5471 | 13" 9370 | 12" 5280 | 3050 | 15" 7520 | 3620 Tower | |
15" 7577 | 15" 7570 | 12" 5288 | 5055 A-Series |
17" 7720 | 3420 Tower | ||
13" 7370 | 14" 3478 | 14" 5480 | 5055 Ryzen CPU |
15" 5530 2-in-1 | 5820 Tower | ||
13" 7373 2-in-1 | 15" 3578 | 14" 5488 | 5250 | 15" 7530 | 7820 Tower | ||
15" 7570 | 15" 5580 | 7050 | 17" 7730 | 7920 Tower | |||
15" 7573 2-in-1 | 11" 3180 | 3050 AIO | 7920 Rack | ||||
13" 5370 | 11" 3189 | 7450 AIO | |||||
15" 5570 | 13" 3380 | ||||||
17" 5770 | 12" 5289 | ||||||
14" 3476 | 13" 7389 | ||||||
15" 3576 | 12" 7212 | ||||||
14" 3490 | |||||||
12" 5285 | |||||||
12" 7280 | |||||||
13" 7380 | |||||||
14" 7480 | |||||||
14" 3480 | |||||||
15" 3580 | |||||||
14" 7490 |
What is USB Wake Support?
There is a BIOS setup setting on some systems called USB Wake Support, which can enable or disable the ability of a USB device to wake the system from the S3 state (Sleep).
When enabled, USB devices can wake the system from S3 (example: USB mouse, USB keyboard). Furthermore, on All in One (AIO) systems, the touch screen is a USB input device and can also wake the system.
When disabled, USB devices cannot wake the system form S3. Disabling this setting can help a user save power by turning off power to the USB ports in S3.
USB Wake Support does not function on battery power; that is, if a laptop system on battery power enters S3, USB devices cannot wake it up. Whether the USB devices are externally powered or derive their power from the system’s USB port makes no difference. The determining factor is whether or not the system’s USB ports are powered and able to detect USB traffic. Upon entering S3, the system turns off power to the USB ports in order to conserve power.
Some systems support a feature called Deep Sleep. For USB Wake to work, the USB ports must not be in Deep Sleep.
Deep Sleep Support: