Questions tagged [pi-4]

For questions that apply specifically to the Raspberry Pi 4 and not other/all models.

1979 questions
49
votes
12 answers

64-bit OS on Raspberry Pi 4

Looking for a 64-bit version of Linux for the Raspberry Pi 4. I'm aware that support under Ubuntu Mate is in the works, apparently Ubuntu Server works but it limited to using 1 GB of RAM. Are there any other options that are working now?
Rasjid Wilcox
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32
votes
1 answer

Does the Pi 4 resolve the Ethernet+USB bottleneck issue of past versions?

The Pi 3 (and previous models) had an issue of bottlenecked bandwidth when using Ethernet and USB simultaneously. Is this resolved in the Pi 4?
Wolf
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31
votes
3 answers

How to disable wifi in Raspberry Pi 4

How to disable WiFi in Raspberry Pi4, possibly keeping the chip powered off.
jb.
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30
votes
6 answers

Choosing a Pi4 power supply

I'm trying to decide what is the best option for powering a Pi4. The specs mention for a minimum of 3A. Let's consider we would also like to connect a 2.5" drive to the Pi4. Could someone more experienced with power supplies help me with the…
m000
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27
votes
5 answers

RPi 4 running Ubuntu Server 20.04: can't connect to WiFi

I'm trying to run my Raspberry Pi 4 on Ubuntu Server 20.04 (64bit) following this tutorial. When I reached 4. Boot Ubuntu Server, my RPi had no IP address (I switched to using a monitor when doing a headless setup failed, and calling hostname -I…
Drake P
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22
votes
4 answers

How to emulate Raspberry Pi in QEMU?

A few years ago, people were saying they were able to emulate a Raspberry Pi 2 or 3 in QEMU. However as of late 2020, I am unable to do so. Can anyone let me know what the correct command line arguments are to emulate a Raspberry Pi 3 or 4 in…
wudude
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19
votes
1 answer

Can the Pi 4 power 2 external USB 3 HDDs?

I would like to connect two external 2.5 HDDs a Pi 4. Can the Pi 4 power two of them at once? This is the model I have in mind: WD 2TB Elements
Pierre Spring
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18
votes
1 answer

Powering the Pi 4 - safe voltage levels and current requirements

How to safely power the Pi 4, more specifically: What voltage levels are safe to power the Pi 4 via the USB-C connector or via the GPIO header? What are the current requirements? What Power Management ICs / voltage regulators are used by the Pi 4?…
Ghanima
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18
votes
3 answers

Where is Raspberry Pi "wastebasket" located in the file system?

I am trying to understand the Raspbian file system better. I opened properties on the Raspberry Pi's "Wastebasket" hoping to find out where it is located in the file system and I found trash:///. Can anyone explain this, please? I expected to find…
Susan
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17
votes
2 answers

Why raspberry pi 4b claims that it's processor is armv7l when in official specification it's ARM v8? How to change it?

I need to run MongoDB docker container on Raspberry Pi 4B. My Raspberry has preset (already installed) Raspbian on SD card, I didn't install OS by myself. MongoDB docker image supports arm64v8. But when I try to run container, it claims that there…
Piotrek
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16
votes
10 answers

How much temperature is normal temperature for Raspberry Pi 4

I am running a haarcascade based face detection and face recognition on Raspberry Pi 4. The CPU temperature rises to 83-84C. So I have installed a heat sink and 5v pi fan. After installing this, I have noticed that temperature is always below 70c.…
S Andrew
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15
votes
1 answer

Pending kernel upgrade even after reboot my RPi4

Every time I update my Pi4, it runs needrestart which complains that I'm using an old kernel version and I should reboot, but rebooting doesn't change anything. First, I have to precise that: I installed a full version on the SD Card (latest one in…
Olivier
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14
votes
3 answers

Fix error "Failed to start DHCP Client Daemon" after upgrade to "Bullseye" remote?

This is a non problem. DO NOT attempt "upgrade" - follow the advice to do a fresh install, NOT a kludge to "fix" the "problem". I did an upgrade to Bullseye and rebooted. I can't login with ssh (also he does not answer ping) and on screen I see…
Sybil
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14
votes
6 answers

Best way to power multiple Raspberry Pi 4s?

I ordered a few Raspberry Pi 4s, still under way, each with their own power supply, and I plan to get more, but when I have been previously able to power RPis with USB-hub, there's apparently no USB-C-hubs, beyond few expensive 2 usb-c-port-hubs, in…
Roger
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14
votes
5 answers

Where is the USB2 OTG port on the RPi 4 Model B located?

According to this answer the Raspberry Pi 4 Model B has a total of five USB ports (two USB3 host, two USB2 host, one USB2 OTG). Where is the fifth USB2 OTG port located and how can I use it? Can I use it with OTG Gadget mode?
Ingo
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