2022 Developer Survey is open! Take survey.

Welcome to Raspberry Pi Stack Exchange

Raspberry Pi Stack Exchange is a question and answer site for users and developers of hardware and software for the Raspberry Pi. It's built and run by you as part of the Stack Exchange network of Q&A sites. With your help, we're working together to build a library of detailed answers to specific questions.

We're a little bit different from other sites. Here's how:


Ask questions, get answers, no distractions

This site is all about getting answers. It's not a discussion forum. There's no chit-chat.

Just questions...

...and answers.

Good answers are voted up and rise to the top.

The best answers show up first so that they are always easy to find.

The person who asked can mark one answer as "accepted".

Accepting doesn't mean it's the best answer, it just means that it worked for the person who asked.

RPI4 won't boot with powered USB hub

14

I have an RPI4 running a Plex server, Pihole, etc etc.

Power kept dropping while running certain tasks involving the attached HDD, so I started using a powered USB3 hub - problem solved.

But now the Pi won't boot with the powered USB hub attached. I have to unplug it, wait for boot, then plug it back in.

What am I missing?

2 Answers

4

You have to make sure that you are getting consistent 5V from the USB hub, and at the very least 1 Amp in current... most usb hubs will only regulate to 500 mA which sounds like what you were getting due to the power drops. Did you see a lightning bolt on the screen when working on the Pi either on commandline mode or Desktop? If you did, you got your answer :)

3

I found the exact same issue in a Reddit post and the solution seems to be a frustrating one - find a more expensive powered USB hub. Oh well.


Get answers to practical, detailed questions

Focus on questions about an actual problem you have faced. Include details about what you have tried and exactly what you are trying to do.

Ask about...

  • Raspberry Pi hardware
  • Raspberry Pi peripherals
  • Software specific to the Raspberry Pi

Not all questions work well in our format. Avoid questions that are primarily opinion-based, or that are likely to generate discussion rather than answers.

Questions that need improvement may be closed until someone fixes them.

Don't ask about...

  • Anything not directly related to the Raspberry Pi
  • Questions that are primarily opinion-based
  • Questions with too many possible answers

Tags make it easy to find interesting questions

All questions are tagged with their subject areas. Each can have up to 5 tags, since a question might be related to several subjects.

Click any tag to see a list of questions with that tag, or go to the tag list to browse for topics that interest you.

RPI4 won't boot with powered USB hub

14

I have an RPI4 running a Plex server, Pihole, etc etc.

Power kept dropping while running certain tasks involving the attached HDD, so I started using a powered USB3 hub - problem solved.

But now the Pi won't boot with the powered USB hub attached. I have to unplug it, wait for boot, then plug it back in.

What am I missing?


You earn reputation when people vote on your posts

Your reputation score goes up when others vote up your questions, answers and edits.

+10 question voted up
+10 answer voted up
+15 answer is accepted
+2 edit approved

As you earn reputation, you'll unlock new privileges like the ability to vote, comment, and even edit other people's posts.

Reputation Privilege
15 Vote up
50 Leave comments
125 Vote down (costs 1 rep on answers)

At the highest levels, you'll have access to special moderation tools. You'll be able to work alongside our community moderators to keep the site focused and helpful.

Reputation Privilege
2000 Edit other people's posts
3000 Vote to close, reopen, or migrate questions
10000 Access to moderation tools
see all privileges

Improve posts by editing or commenting

Our goal is to have the best answers to every question, so if you see questions or answers that can be improved, you can edit them.

Use edits to fix mistakes, improve formatting, or clarify the meaning of a post.

Use comments to ask for more information or clarify a question or answer.

You can always comment on your own questions and answers. Once you earn 50 reputation, you can comment on anybody's post.

Remember: we're all here to learn, so be friendly and helpful!

9

You have to make sure that you are getting consistent 5V from the USB hub, and at the very least 1 Amp in current... most usb hubs will only regulate to 500 mA which sounds like what you were getting due to the power drops. Did you see a lightning bolt on the screen when working on the Pi either on commandline mode or Desktop? If you did, you got your answer :)

edit

I'll see if I can find out what the hub is doing with power, as I suspect you're correct - however I haven't once seen the lightning bolt! - lukenm Jul 17, 2019 at 9:12

add a comment


Unlock badges for special achievements

Badges are special achievements you earn for participating on the site. They come in three levels: bronze, silver, and gold.

In fact, you can earn a badge just for reading this page:

 Informed Read the entire tour page
 Student First question with score of 1 or more
 Editor First edit
 Good Answer Answer score of 25 or more
 Civic Duty Vote 300 or more times
 Famous Question Question with 10,000 views

see all badges


Sign up to get started

Signing up allows you to:

  • Earn reputation when you help others with questions, answers and edits.
  • Select favorite tags to customize your home page.
  • Claim your first badge:  Informed
Looking for more in-depth information on the site? Visit the Help Center

Raspberry Pi Stack Exchange is part of the Stack Exchange network

Like this site? Stack Exchange is a network of 179 Q&A sites just like it. Check out the full list of sites.

Stack Exchange