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by OutsourcedGuru
Fri Dec 06, 2019 10:51 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4B reboot with display sleep unwanted behavior
Replies: 1
Views: 69

Re: Raspberry Pi 4B reboot with display sleep unwanted behavior

Having just spent hours at this, I now have a working solution. * The elo touch's OSD menu setting wake-on-touch needs to be disabled * The Pi's hdmi_force_hotplug=1 needs to be set in the /boot/config.txt Somehow, the wake-on-touch feature of the elo touch display was setting things up for a fatal ...
by OutsourcedGuru
Fri Dec 06, 2019 5:57 pm
Forum: Troubleshooting
Topic: Updates blocked by school web filter
Replies: 7
Views: 222

Re: Updates blocked by school web filter

The Raspberry Pi computer is likely now part of a STEM/STEAM program at the school. As a long-time I.T. professional I just have to shake my head that they haven't tested anything themselves within this setup. Contact them, describe the scenario and put the work on them to research this and to fix i...
by OutsourcedGuru
Fri Dec 06, 2019 5:53 pm
Forum: Troubleshooting
Topic: Pi4 firmware and teething issues
Replies: 6
Views: 284

Re: Pi4 firmware and teething issues

I've always been a bit unsure of this...if I'm running buster lite, does full-upgrade or other alternatives (i.e., other than "update/upgrade") add the non-lite packages? I don't want to end up having a full buster image...just looking for some clarification. Thanks in advance. No, the suggestion w...
by OutsourcedGuru
Fri Dec 06, 2019 5:50 pm
Forum: Troubleshooting
Topic: Pi4 - 4GB (rev. 1.1) Freezes [Attempted troubleshooting]
Replies: 16
Views: 531

Re: Pi4 - 4GB (rev. 1.1) Freezes [Attempted troubleshooting]

I've just started a thread which I think may be related to hdmi_blanking on the Pi 4B. In my case, it behaves well on startup. On reboot, it turns off the HDMI output on shutdown followed by the display adapter then toggling into sleep mode. The Pi 4B then begins the startup process, sees that the d...
by OutsourcedGuru
Fri Dec 06, 2019 4:35 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4B reboot with display sleep unwanted behavior
Replies: 1
Views: 69

Raspberry Pi 4B reboot with display sleep unwanted behavior

I'm converting an existing project from Raspberry Pi 3B over to Raspberry Pi 4B and have a big problem I need to get past. * If everything is started from no power (Pi + display) then everything works fine on both Pi3B/Pi4B platforms * If I reboot the Pi3B platform, it works fine; the display never ...
by OutsourcedGuru
Thu Oct 24, 2019 8:11 pm
Forum: Troubleshooting
Topic: RPi 3B hangs on (re)boot
Replies: 6
Views: 292

Re: RPi 3B hangs on (re)boot

I'm seeing intermittent hangs on startup and long-delay hangs at the end of the shutdown portion of a reboot. I believe that it is related to what's being described on this thread and that it has to do with that fake-hwclock behavior. Raspberry Pi 3B, Raspbian Buster Lite, Linux octopi 4.19.58-v7+ #...
by OutsourcedGuru
Sat Oct 19, 2019 11:07 pm
Forum: Beginners
Topic: GPU & CPU Temp in Fahrenheit
Replies: 28
Views: 9481

Re: GPU & CPU Temp in Fahrenheit

Dougie is skating on very thin ice with that signature of his. Well, you saw my response earlier An operating system if it's released to the world should attempt to make the world's citizens feel included. We add locales, default languages, we format references to money and dates correctly for each...
by OutsourcedGuru
Sat Oct 19, 2019 10:57 pm
Forum: Troubleshooting
Topic: HELP! Rpi4 stuck at rainbow stage after firmware update.
Replies: 12
Views: 1339

Re: HELP! Rpi4 stuck at rainbow stage after firmware update.

DougieLawson wrote:
Wed Aug 07, 2019 8:49 pm
You can't "brick" a RPi.
You can, though, update the OTP in such a way that you can't un-write that. The "OT..." part means "one-time" and that means forever.
by OutsourcedGuru
Sat Oct 19, 2019 10:52 pm
Forum: Advanced users
Topic: Connect two Raspberries via USB Type-A crossover cable
Replies: 9
Views: 1289

Re: Connect two Raspberries via USB Type-A crossover cable

@Dougie I was attempting (temporarily) use a Raspberry Pi to mimic a PyBoard that was on order and hadn't arrived yet. I wanted to begin coding a serial interface as soon as possible so I wanted to use another Pi as a surrogate. I got this to work via GPIO cabling and later, the PyBoard came in and ...
by OutsourcedGuru
Sat Oct 19, 2019 10:48 pm
Forum: Advanced users
Topic: Raspberry Pi 4B and firmware-loaded-to-chip information
Replies: 8
Views: 1406

Re: Raspberry Pi 4B and firmware-loaded-to-chip information

Installing bad firmware could cause the Pi to fail to start, but there is a recovery method. You download the latest known good firmware file from the downloads page and put it on a freshly FAT32 formatted micro SD card. Put that card in the Pi and turn it on. After a while the ACT LED will start b...
by OutsourcedGuru
Tue Oct 15, 2019 12:11 am
Forum: Advanced users
Topic: Raspberry Pi 4B and firmware-loaded-to-chip information
Replies: 8
Views: 1406

Raspberry Pi 4B and firmware-loaded-to-chip information

From what I understand, the new Raspberry Pi 4B does something different with respect to where it stores firmware. In the past it seems like all the firmware was on the microSD card. And now, some of it gets flashed to one of the chips...? "One important new thing to understand about the Raspberry P...
by OutsourcedGuru
Mon Oct 14, 2019 11:09 pm
Forum: General discussion
Topic: Encountered "Failed to add service" in Raspberry Pi 4
Replies: 4
Views: 325

Re: Encountered "Failed to add service" in Raspberry Pi 4

The reason would be that the underlying Kivy abstraction layer for the egl uses OpenGL ES v2. The Pi 4B now has OpenGL ES v3. https://i.imgflip.com/3dbhtw.jpg I suppose we're all screwed until the Raspberry Pi Foundation publishes the v3-related header files for OpenGL ES 3.0 or 3.1 since nobody has...
by OutsourcedGuru
Thu Oct 03, 2019 3:19 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4B not working with Kivy
Replies: 5
Views: 686

Re: Raspberry Pi 4B not working with Kivy

And yet, there still is no solution which is compatible for Raspbian Buster Lite (no Desktop) which simply works in kiosk mode as it did before, rendering a fullscreen to a TFT display. There have been many attempts but the status still (October 2019) is that there is no solution yet until somebody ...
by OutsourcedGuru
Tue Aug 20, 2019 7:33 pm
Forum: Advanced users
Topic: Connect two Raspberries via USB Type-A crossover cable
Replies: 9
Views: 1289

Re: Connect two Raspberries via USB Type-A crossover cable

It won't work, can't work. USB is not the same as UART / GPIO linking. You would need two USB-to-Serial adapters then cross-over the Rx/Tx pins of the two serial modules, and have their 0V linked. Connecting the UART on two Pi's, both as /dev/serial0 should work. It worked between a Pi and an Ardui...
by OutsourcedGuru
Tue Aug 20, 2019 7:30 pm
Forum: Advanced users
Topic: Connect two Raspberries via USB Type-A crossover cable
Replies: 9
Views: 1289

Re: Connect two Raspberries via USB Type-A crossover cable

There is no such thing as a USB-A to USB-A crossover cable. The 4 USB sockets on a Pi are host mode only and you can't connect host to host. If you only want a single low speed serial link between the two Pi boards then use 2x USB to serial adapters and cross over the UART connection. Up to you if ...
by OutsourcedGuru
Tue Aug 20, 2019 7:06 pm
Forum: Advanced users
Topic: Connect two Raspberries via USB Type-A crossover cable
Replies: 9
Views: 1289

Connect two Raspberries via USB Type-A crossover cable

I'm trying to attempt something so that I might test serial communications between two standard Raspberry Pi 3B computers. It's so that I can develop some serial-based software so it doesn't have to be pretty. * Most of the tutorials I've seen involve using the GPIO pins in order to talk over serial...
by OutsourcedGuru
Fri Aug 16, 2019 5:49 pm
Forum: OpenGLES
Topic: RPi 4 OpenGL ES 3.0 ShaderToy to download (100+ examples)
Replies: 49
Views: 10021

Re: RPi 4 OpenGL ES 3.0 ShaderToy to download (100+ examples)

Tried this locally on Raspbian Buster Desktop 4.9 with Raspberry Pi 4B (4GB) and it works great (noting that I adjusted the `gpu_mem` to 128 as suggested). It brings up another window to display the graphical output. This is using a SunFounder 10.1" TFT display for what it's worth and it's attached ...
by OutsourcedGuru
Fri Aug 09, 2019 5:30 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4B not working with Kivy
Replies: 5
Views: 686

Re: Raspberry Pi 4B not working with Kivy

I note that on a working Raspberry Pi 3B, this is seen in the Kivy log: [INFO ] Window: Provider: egl_rpi [INFO ] GL: Using the "OpenGL ES 2" graphics system [INFO ] GL: Backend used <gl> [INFO ] GL: OpenGL version <OpenGL ES 2.0> [INFO ] GL: OpenGL vendor <Broadcom> [INFO ] GL: OpenGL renderer <Vid...
by OutsourcedGuru
Wed Aug 07, 2019 8:22 pm
Forum: Troubleshooting
Topic: HELP! Rpi4 stuck at rainbow stage after firmware update.
Replies: 12
Views: 1339

Re: HELP! Rpi4 stuck at rainbow stage after firmware update.

I wouldn't recommend rpi-update to anyone who's not developing hardware drivers, for example.

rpi-update => bricked raspberry
by OutsourcedGuru
Wed Aug 07, 2019 8:16 pm
Forum: Troubleshooting
Topic: No audio through 3.5 jack pi 4
Replies: 4
Views: 464

Re: No audio through 3.5 jack pi 4

If you're trying to use something like `aplay` to play a file then it's probably good to first run `alsamixer` to adjust the volume. To me, it seems like setting the volume there to 40 was perfect for the Raspberry Pi 3B but had to set it much higher on the Raspberry Pi 4B as I recall (80?).
by OutsourcedGuru
Wed Aug 07, 2019 8:12 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4B not working with Kivy
Replies: 5
Views: 686

Raspberry Pi 4B not working with Kivy

I have yet to be able to get even the simplest of Kivy examples to work. Tried both Buster Lite and Buster Desktop from 7/10/2019 Added the `KIVY_GL_BACKEND=gl` to the environment Commented-out the `dtoverlay=vc4-fkms-v3d.` in config.txt Tried selecting HDMI with `KIVY_BCM_DISPMANX_ID=2` Edit to `.k...
by OutsourcedGuru
Wed Aug 07, 2019 7:51 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 564
Views: 203508

Re: Raspberry Pi 4 temperature

I'm noting that I purchased/installed the Zebra 4 fan case and the CPU temperature is reporting around 39C (reasonably idle with 35 processes running), for what it's worth.
by OutsourcedGuru
Mon Jan 28, 2019 4:49 pm
Forum: Other programming languages
Topic: NPM start on start-up? Help wanted
Replies: 12
Views: 11338

Re: NPM start on start-up? Help wanted

> "Just drop your service file into /etc/systemd/system and away you go." I spent hours trying to get this "just" version to work. I'm suggesting that with Raspbian Stretch it needs to be in the way I'm describing. I will note that the "After" line in the [Unit] section needs to instead be: After=ne...
by OutsourcedGuru
Fri Jan 25, 2019 10:16 pm
Forum: Other programming languages
Topic: NPM start on start-up? Help wanted
Replies: 12
Views: 11338

Re: NPM start on start-up? Help wanted

For anyone trying to follow along with Raspbian Stretch, I found that "/etc/systemd" was not the place where it wanted to see these "*.service" files. Also, the default file restrictions appear to be wrong as seen above. Path: /lib/systemd/system/yourapp.service Rights: sudo chmod 644 /lib/systemd/s...
by OutsourcedGuru
Tue May 29, 2018 12:20 am
Forum: Advanced users
Topic: Raspi3 to Raspi0 via USB serial communications
Replies: 8
Views: 922

Re: Raspi3 to Raspi0 via USB serial communications

Okay, was able to get the Raspi3 and Raspi0 to talk via minicom so I'm guessing that I'm good to go now. Thanks.

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