I will give it a try when I have a chance. To be honest I am not hopeful because in my experience the lap dock has been the least fussy HDMI display in the house, and my "go to" device when I have problems with other devices.jamesh wrote: ↑Fri Jun 28, 2019 10:41 amDoes the output work when plugged in to a normal HDMI equipped monitor or TV? (I'm presuming the lapdock this is some sort of HDMI->LCD system?)Mortimer wrote: ↑Thu Jun 27, 2019 8:34 pmI am having trouble getting HDMI output from my new RPi4. I am able to get to it via SSH, so would appear to be working. The display (Motorola Atrix Lapdock) is not complaining that there is no signal, which it does if I switch the connection to the HDMI-1 port. So I presume there is a signal there, but the lap dock is not displaying it.
I tried the following:
hdmi_force_hotplug:0 = 1
hdmi_group:0 = 2
hdmi_mode:0 = 39
The lap dock now displays the four raspberries, then it blanks with a flashing cursor. I will get a brief flash of the splash screen (less than a second) a few more seconds of flashing cursor then the screen goes completely black and nothing further is displayed.
Thanks for the pointers, I'll give it another go when I get home (away at sea at the moment).procount wrote: ↑Mon Jul 08, 2019 9:28 pm@Mortimer - It turns out I already had a uHDMI socket -> plug extension cable, so I was finally able to connect my Pi4 up to my lapdock.
I already had the SD card configured to use HDMI and VGA666 on the GPIO pins, so I plugged it in and booted.
i didn't have any problems at all. I had an extended desktop across the VGA666 interface and the HMDI0 connected lapdock.
Well, the only problem I had was my uHDMI cable is a bit flaky and I had to wiggle it occasionally when the picture disappeared.
You do need the USB cable connected between the lapdock and the Pi4 so the lapdock knows something is connected (even though I used an external mouse and keyboard because my lapdock has some dead keys).
I powered the Pi4 from the USB-C output port of my laptop whilst it was running on batteries.
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hdmi_ignore_edid=0xa5000080 hdmi_group=2 hdmi_mode=86 hdmi_force_mode=1
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Are you using a direct micro-HDMI to HDMI cable, or a micro-HDMI adapter?markewallace wrote: ↑Tue Jul 09, 2019 9:00 pmNew Pi4 user here. Pardon the newbiness, please.
... however, before I could actually get anything else installed, suddenly my screen (a Sharp 50-something-inch TV) went blank and then I got a "No Signal" from it.
I have tried unplugging/replugging the power and HDMI inputs/outputs as well as trying different HDMI ports on the TV. Nothing seems to bring the video back.
Red LED means you are getting power. Does the green activity LED blink at all, and is it random or a pattern?The red light on the end of the RPi is red. I haven't looked to see if this is bad or good.
Read the boot problems sticky for troubleshooting tips.Any tips for me?
Using all stock everything, including the direct micro to HDMI cable from Canakit.
I'm guessing you tried HDMI-0 and that worked but HDMI-1 didn't. that happened to me too and others.markewallace wrote: ↑Sat Jul 13, 2019 3:33 pmUsing all stock everything, including the direct micro to HDMI cable from Canakit.
I took the whole setup upstairs last night and plugged it in to my Dell monitor. I still get a No Signal, but I found that it is just from *one* of the HDMI ports. The other one works fine.
Is it possible that plugging the Pi in to my TV fried the HDMI port? It worked briefly a few days ago but then gave me the No Signal thing, and now that same port doesn't work on just a regular monitor.
I haven't tried taking the Pi back downstairs and plugging it back in to the TV. A little nervous that that could fry my only remaining HDMI output, if indeed that is what happened on the first one.
But it worked briefly and now doesn't work on either of two displays.
Yes, same here; you could always try and RMA it from where you purchased from but you're not the only one and afaik it will be fixed via an update.markewallace wrote: ↑Sat Jul 13, 2019 4:19 pmBut it worked briefly and now doesn't work on either of two displays.
Is there a way for me to tell if the port is just dead now?
If so, I need to get the board exchanged for a good one. Right now I only intend to use one monitor, but it's possible that someday I will want to use two, for which of course I would need two functional HDMI ports.