{"id":677,"date":"2019-01-26T11:21:06","date_gmt":"2019-01-26T16:21:06","guid":{"rendered":"http:\/\/www.k2dls.net\/blog\/?p=677"},"modified":"2019-01-26T23:01:49","modified_gmt":"2019-01-27T04:01:49","slug":"turn-of-hdmi-on-pi-star-image","status":"publish","type":"post","link":"https:\/\/www.k2ie.net\/blog\/2019\/01\/26\/turn-of-hdmi-on-pi-star-image\/","title":{"rendered":"Turn off HDMI on Pi-Star Image"},"content":{"rendered":"\n

It is common practice on headless Raspberry Pi computers to turn off the HDMI to save some power. Even without a monitor attached, the HDMI hardware seems to draw ~ 50 ma of current. However, in the interest of saving space in the image, Pi-Star<\/a> (as distributed) lacks the necessary tvservice command to turn off the HDMI hardware.<\/p>\n\n\n\n

This command is part of the Raspberry PI “userland” package, which for some reason is not packaged as a .deb. So you’ll have to grab the code off github, but it is pretty easy. Before starting, make certain that you have expanded the filesystem of your image to fill the SD card.<\/p>\n\n\n\n

sudo pistar-expand
sudo reboot<\/pre>\n\n\n\n
After the reboot, do the following:<\/p>\n\n\n\n
rpi-rw
git clone https:\/\/github.com\/raspberrypi\/userland
sudo apt-get install cmake -y
cd userland
.\/buildme<\/pre>\n\n\n\n
Add the libraries to the ld.so search patch by creating a file named “userland.conf” in \/etc\/ld.so.conf.d.  In that file add the following line:<\/p>\n\n\n\n
\/opt\/vc\/lib<\/pre>\n\n\n\n
Next, update the ld.so search path:<\/p>\n\n\n\n
sudo ldconfig -v<\/pre>\n\n\n\n
You can now run the tvservice command:<\/p>\n\n\n\n
## Status
sudo \/opt\/vc\/bin\/tvservice -s
## Turn off HDMI
sudo \/opt\/vc\/bin\/tvservice -o<\/pre>\n\n\n\n
All that is left to be done is to add the HDMI off command to your \/etc\/rc.local file so that it will run every time the system boots.<\/p>\n","protected":false},"excerpt":{"rendered":"
It is common practice on headless Raspberry Pi computers to turn off the HDMI to save some power. Even without a monitor attached, the HDMI hardware seems to draw ~ 50 ma of current. However, in the interest of saving space in the image, Pi-Star (as distributed) lacks the necessary tvservice command to turn off … Continue reading “Turn off HDMI on Pi-Star Image”<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,6],"tags":[123,124,122,125,18,29],"class_list":["post-677","post","type-post","status-publish","format-standard","hentry","category-radio","category-technology","tag-hdmi","tag-mw0mwz","tag-pi-star","tag-power","tag-raspberry-pi","tag-rpi"],"_links":{"self":[{"href":"https:\/\/www.k2ie.net\/blog\/wp-json\/wp\/v2\/posts\/677","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.k2ie.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.k2ie.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.k2ie.net\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.k2ie.net\/blog\/wp-json\/wp\/v2\/comments?post=677"}],"version-history":[{"count":16,"href":"https:\/\/www.k2ie.net\/blog\/wp-json\/wp\/v2\/posts\/677\/revisions"}],"predecessor-version":[{"id":697,"href":"https:\/\/www.k2ie.net\/blog\/wp-json\/wp\/v2\/posts\/677\/revisions\/697"}],"wp:attachment":[{"href":"https:\/\/www.k2ie.net\/blog\/wp-json\/wp\/v2\/media?parent=677"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.k2ie.net\/blog\/wp-json\/wp\/v2\/categories?post=677"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.k2ie.net\/blog\/wp-json\/wp\/v2\/tags?post=677"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}