====== Differences ====== This shows you the differences between two versions of the page.
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power [2016/06/20 03:30] admin [HDMI] |
power [2016/06/20 03:47] (current) admin [WiFi & Bluetooth] |
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| The power hungry monsters in the Raspberry Pi are certainly the USB and Network Adapters. They were reported to consume as much as 200mA! Turning them off will enhance the system's autonomy when running off a power bank. | The power hungry monsters in the Raspberry Pi are certainly the USB and Network Adapters. They were reported to consume as much as 200mA! Turning them off will enhance the system's autonomy when running off a power bank. | ||
| - | === USB === | + | === USB (+ Ethernet) === |
| - | To switch the USB bus on a RasPi one can use the following commands: | + | To **switch off the USB bus** on a RasPi, which will in effect **also switch off the Ethernet** port that is linked to this same bus, one can use the following commands: |
| <Code:bash |**Turn off USB** on the Raspberry Pi:> | <Code:bash |**Turn off USB** on the Raspberry Pi:> | ||
| > echo 0x0 > /sys/devices/platform/bcm2708_usb/buspower | > echo 0x0 > /sys/devices/platform/bcm2708_usb/buspower | ||
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| To **turn HDMI back on**, you'll need to have the **''kbd''** package installed to access and use the ''chvt'' command: | To **turn HDMI back on**, you'll need to have the **''kbd''** package installed to access and use the ''chvt'' command: | ||
| - | <Code:bash |Video Groups Modes> | + | <Code:bash |Turn HDMI back on> |
| > /opt/vc/bin/tvservice -p && chvt 1 && chvt 7 | > /opt/vc/bin/tvservice -p && chvt 1 && chvt 7 | ||
| </Code> | </Code> | ||
| - | So when you want to turn the HDMI back on with, lets say, a 1024x768@60Hz screen: | + | ==== WiFi & Bluetooth ==== |
| - | <Code:bash | Turning HDMI back on at a specific resolution> | + | https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=138610 |
| - | > /opt/vc/bin/tvservice -e="DMT 16 HDMI" | + | |
| - | </Code> | + | http://www.mikeslab.net/?p=455 |
