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30

No, the Pi Zero does not support ethernet over HDMI. Unfortunately the schematics for the Pi Zero are not available (edited: an overview schematics is available now, see updated information below). However since it is essentially an minimized Pi 1 I'd bet that the HDMI circuitry is (nearly) the same - though the Pi 1 features a standard sized HDMI connector ...


26

tvservice is not the best to turn off and on the screen. Much better way to do this (found after a day of searching) is using vcgencmd command (more on this here). vcgencmd display_power 0 turns off the screen vcgencmd display_power 1 turns on the screen This allows the Qt application to be visible on the screen after turning it off and back on.


26

In /boot/config.txt: hdmi_force_hotplug=1 hdmi_group=1 hdmi_mode=16 Those are explained here: https://www.raspberrypi.org/documentation/configuration/config-txt/video.md There is also this: https://www.raspberrypi.org/documentation/configuration/hdmi-config.md -- But if the group 1, mode 16 as above works, you don't have to worry about all that.


23

There is a few things you can try: 1) Edit /etc/rc.local and add the following lines above exit 0: # Disable HDMI /usr/bin/tvservice -o this will turn off the display, but only somewhere during the boot sequence 2) add hdmi_blanking setting to your /boot/config.txt I found the follwing settings here: hdmi_blanking=0: HDMI Output will be blank when DPMS ...


18

The best information I can find suggests that it's possible to output 4K resolutions, but at fairly miserable frame rates. The Pi 3 has the same GPU as the Pi 2, so the information should still be valid: Source: https://www.raspberrypi.org/forums/viewtopic.php?f=38&t=79330 I have managed to get 3840 x 2160 (4k x 2k) at 15Hz on a Seiki E50UY04 ...


16

That cable is most likely a DisplayPort-to-HDMI cable not a HDMI-to-DisplayPort cable (mind the direction). While there are DP ports able to support HMDI signals (DisplayPort Dual-mode) HDMI does not support DP directly. Since HDMI data transmission is very different from DP there will be no simple (passive) cable that just re-routes some signal lines on the ...


14

I believe the tape is useful for manufacturing using a vacuum based pick and place machine. The machine can't pick the parts up if they're full of holes. Removing it shouldn't do any harm.


11

There's a command line utility, tvservice built into Raspbian that will tell you the state of the HDMI. To detect the full state, you can use the command: tvservice -s. On my RPi this currently outputs: state 0x40001 [NTSC 4:3], 720x480 @ 60.00Hz, interlaced The states (that I've gathered) are as follows: 0x40001 Not initialized and HDMI cable is ...


10

While the official Raspberry schematics don't tell a thing about these components we can learn from the picture of the PCB that they are connected to the paired pins 1 and 3, 4 and 6, 7 and 9, 10 and 12 - that's all the differential signal and clock lines. Since the devices have just four pads (not six) they are not dual-rail clamp ESD protectors, e.g. see ...


9

The Raspberry Pi Foundation claims unambiguously that a VGA adapter on the GPIO header "means you can use it as a secondary monitor alongside HDMI" (from here). You should certainly be able to do that via USB; for evidence of the the pi running multi-headed, see comments below. The exception, of course, is trying to use the HDMI and the RCA video ...


9

No. HDMI to Ethernet adapters are used to send HDMI display data over an Ethernet cable, rather than network data over HDMI. This won't work.


8

omxplayer now has an option to set the background to black. omxplayer -b It works both on the terminal and in X. This feature should be in the current version available in raspbian.


8

If you want to use the PI exclusively as a HTPC or media center, you could use a distribution geared towards such applications. OpenELEC/XBMC /RasBMC seem to be the obvious choice. I did try OpenELEC at one time, but getting WiFi to work reliably on it seemed to be a pain. Here's how I went about using Raspbian (since I use the RPi for tasks other than ...


8

I think you can just switch it off, but I do not know how much power is saved. Switch off /opt/vc/bin/tvservice -o Switch on /opt/vc/bin/tvservice -p


8

I used the following to calibrate my display https://github.com/ukscone/set_overscan I found this on http://www.raspberrypi.org/forums/viewtopic.php?p=305797&sid=4fe5fc284854fe3723841f79ea2c6546#p305797


8

To /boot/config.txt add: hdmi_force_hotplug=1 You will have to reboot to make that effective (this applies to anything in config.txt), but the display should work now if you plug it in after boot. However, the resolution may not be set as correctly as it is when booted with the screen attached. To ensure that, set an explicit mode as explained here.


7

Try verifying the output of the file: /sys/class/drm/card0-HDMI-A-1/status The part card0-HDMI-A-1 may be a little different (verify the parent directory for the correct file) and the content should be connected or disconnected. Also works for another connections, like VGA, LVDS, etc. After this, simply make a script like: while [ 1 ] do STATUS=`cat /...


7

There's another setting in your /boot/config.txt that affects sound: hdmi_group If you want sound over HDMI, config.txt should have both: hdmi_group=1 hdmi_drive=2 You need them both set because hdmi_group=1 tells the kernel we are using CEA mode (for TV's, has sound) instead of DMT mode(for monitors, no sound) and hdmi_drive=2 tells the kernel to use ...


7

Try tvservice --explicit="DMT 35 HDMI" This powers on HDMI explicitly with "DMT mode 35" which is 60 HZ at 1280x1024 pixels. There is also tvservice --off if you've got enough. For more information try both tvservice --help and looking here for a tabular listing of modes.


7

Based on the type of flashing of the green (ACT) LED, you can figure out what is wrong (or at least what ballpark it's in) by looking at this page. Too long didn't read version: Green LED: ACT LED ------ Red LED: PWR LED Simple Issues No PWR LED - No power. PWR LED Blinking - Not enough power. PWR LED but no ACT LED (For Pi 1s) - Problem with SD card. ...


7

I am using xset dpms force off to turn off the display. This command uses Display Power Management Signaling. In a cron job, you'll need to set the DISPLAY variable, so that the crontab entries become something like: 0 22 * * * DISPLAY=:0 xset dpms force off 0 7 * * * DISPLAY=:0 xset dpms force on Make sure the X server is started with -...


7

The most likely scenario is that the Pi has booted, but you have asked it to do the impossible i.e. boot to Desktop when there is no default Desktop (an examination of the boot logs would probably confirm this). See Pi4 Boot Problems Sticky You have 2 options:- Boot to console. Force HDMI Uncomment the below line in the file /boot/config.txt: # uncomment ...


7

This in fact is a known problem with the Sense-Hat. See https://github.com/astro-pi/python-sense-hat/issues/96 for detail. Apparently, the Sense-Hat interferes with the resolution auto-detection if there is no monitor attached (works fine with monitor attached). The work around is to manually specify a resolution (you do not have to force HDMI). You can ...


7

Most laptop hdmi ports are output not input. They are designed to connect a laptop to a monitor. There are a few that have hdmi input. You could use VNC Viewer on your laptop to view the Pi screen (by enabling VNC in Pi Configuration) over wifi/network.


6

In addition to @Krzystof 's excellent answer, I would quote what I read in this post: Include the hdmi_ignore_cec_init=1 switch in /boot/config.txt. Then in Settings>System>Input devices>Peripherals>CEC turn off the option: "Make XBMC the active source at start".


6

You need to do two things : 1 Setup your xorg.conf with two layouts , HDMIOnly and TFTOnly. Use this as inspiration : https://www.raspberrypi.org/forums/viewtopic.php?f=44&t=91764&start=25#p661085 2 Use a script to auto-switch between the two layouts. Try this: #!/bin/bash HDMI_ON = false while true; do if (/usr/bin/tvservice -s | /bin/egrep '...


6

The safest touchscreen would be one that is built for the pi and has in-tree kernel drivers so you do not get stuck having to use a manufacturer's OS image that is likely to fall (or already be) out of date and may cause you other kinds of subsequent grief. Unfortunately, navigating that realm is problematic because people in the latter category will still (...


6

Same issue a few days ago. Order of plugged in peripherals mattered. Making sure video out was connected before connecting power.


6

While I can't specifically identify them from this picture where any markings they may have are hidden, that is almost certainly the problem with your HDMI output. If you look at the three that are not sideways, you can see that solder goes from their connectors down to the runs on the board. It appears each one has four connections, and the two presumably ...


6

What you have is a manufacturing defect called a cold solder joint. There was not enough heat or flux present to properly wet the solder to the component. This is a very weak joint, and may have passed any electrical test the manufacturer may (or may not) have performed. This can be caught by human or automated visual inspection of the board. The joint ...


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