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by bromham
Wed Jul 10, 2019 8:48 pm
Forum: Troubleshooting
Topic: Pi 4 fails to boot when active USB switch attached
Replies: 16
Views: 998

Re: Pi 4 fails to boot when active USB switch attached

bromham wrote:
Wed Jul 10, 2019 8:26 pm

Are there any powered USB-hubs that don't back-power?
To answer my own question (sorry - should have Google'd before posting), yes, there are. This one from Pi-hut is reported as not doing so. Something to be aware of when connecting disks to the Pi 4.
by bromham
Wed Jul 10, 2019 8:26 pm
Forum: Troubleshooting
Topic: Pi 4 fails to boot when active USB switch attached
Replies: 16
Views: 998

Re: Pi 4 fails to boot when active USB switch attached

Same problem when restarting with a powered USB hub that presumably backpowers the RPi Then, even if a USB device "shouldn't" back-power the computer it's connected to, the Pi 4 is unusual in refusing to boot in this situation. No other computer I've ever used with a powered hub (including earlier ...
by bromham
Wed Jul 10, 2019 5:59 pm
Forum: Troubleshooting
Topic: Pi 4 fails to boot when active USB switch attached
Replies: 16
Views: 998

Re: Pi 4 fails to boot when active USB switch attached

This issue doesn't apply to the Pi 3B. I've just swapped over my Pi 4 for a Pi 3B and it boots consistently when attached to the USB switch whether or not the other computer attached to the switch is switched on and whichever computer is selected on the switch. I don't have a 3B+ to check but I susp...
by bromham
Tue Jul 09, 2019 9:11 pm
Forum: Troubleshooting
Topic: Pi 4 fails to boot when active USB switch attached
Replies: 16
Views: 998

Re: Pi 4 fails to boot when active USB switch attached

Thanks to Chimneyfactory and trejan for their comments. Another way of avoiding the issue may be to insert a diode in the red power wire in the USB cable between the switch and the PI, so that the switch can be powered from the Pi but the Pi can't be back-powered from the "other computer" via the sw...
by bromham
Sat Jul 06, 2019 9:38 pm
Forum: Troubleshooting
Topic: Pi 4 fails to boot when active USB switch attached
Replies: 16
Views: 998

Pi 4 fails to boot when active USB switch attached

I have an interesting issue with my new Pi 4 (4 GB) with the official power supply. I have a Ugreen USB switch that switches a keyboard and mouse between two computers when a button on the switch is pressed. The keyboard and mouse plug into the switch and there are two USB cables on the other side o...
by bromham
Tue Jul 02, 2019 4:12 pm
Forum: General discussion
Topic: Pi 4 stock at Cambridge shop?
Replies: 6
Views: 410

Re: Pi 4 stock at Cambridge shop?

Thanks to jamesh and kotovasii. I called in this afternoon and can confirm there are still plenty of Pi 4s plus all accessories. I think the Cambridge shop is the only source of Pi 4 cases at the moment - all the usual vendors seem to be out of stock. It would be useful (for those living near-ish bu...
by bromham
Mon Jul 01, 2019 9:17 pm
Forum: General discussion
Topic: Pi 4 stock at Cambridge shop?
Replies: 6
Views: 410

Re: Pi 4 stock at Cambridge shop?

Apparently not. I've seen a reference (some months old) to plans for a webpage showing stock levels. That would be helpful but I don't think it was ever done.
by bromham
Mon Jul 01, 2019 8:43 pm
Forum: General discussion
Topic: Pi 4 stock at Cambridge shop?
Replies: 6
Views: 410

Pi 4 stock at Cambridge shop?

Does anyone know whether the shop in Cambridge still has a stock of Pi 4s with all the bits? I want a 4 GB Pi 4, PSU, official case and HDMI cable and I'm wondering if it's worth a 90 minute trip to Cambridge. I don't really want to go all that way and have a wasted trip.
by bromham
Sat Oct 27, 2018 7:01 pm
Forum: Troubleshooting
Topic: Need help resolving TVHeadEnd Install Error [Details inside]
Replies: 6
Views: 682

Re: Need help resolving TVHeadEnd Install Error [Details inside]

PS: When using VLC, select Media -> Open Network Stream and enter:
to start streaming from the TV Hat.
by bromham
Sat Oct 27, 2018 6:52 pm
Forum: Troubleshooting
Topic: Need help resolving TVHeadEnd Install Error [Details inside]
Replies: 6
Views: 682

Re: Need help resolving TVHeadEnd Install Error [Details inside]

I'm running the DVB-T Hat on the rPi 2b but the picture has major stutter. That's a "well-known problem" if you're using the viewer built-in to the tvheadend web server. Try using client software instead. I've found that using VLC to connect to the Pi works perfectly. It's so good that even a Pi Ze...
by bromham
Sat Oct 27, 2018 4:26 pm
Forum: Media centres
Topic: New TV Tuner from HQ
Replies: 131
Views: 41835

Re: New TV Tuner from HQ

I have the TV HAT running on a Pi Zero and it's impressive how well it works. The Zero is quite happy streaming to four separate devices (and probably more) simultaneously. Like others have found, the picture is very jerky and unwatchable when using the tvheadend web server but is perfect when using...

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