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by geffers
Mon Sep 23, 2019 9:09 am
Forum: General discussion
Topic: Back Voltage from USB Hub
Replies: 19
Views: 563

Re: Back Voltage from USB Hub

I'm a wee bit puzzled with this back power issue. In the early days of Desktops, powered hubs were the norm otherwise, if used in passive mode the 4 (or 8) port hub could only use a maximum of 500mA being the current output of the single port the hub is plugged in to. I never had even heard of the t...
by geffers
Mon Sep 23, 2019 8:55 am
Forum: General discussion
Topic: Back Voltage from USB Hub
Replies: 19
Views: 563

Re: Back Voltage from USB Hub

As I am interested in acquiring a powered USB hub I have followed this thread, but I'm still not clear on whether the Pi Hut accessory is not back-powering the Pi. The PiHut hub definitely back powered the Pi. No connection was made to the microUSB power input socket on the Pi. It was a very early ...
by geffers
Wed Sep 18, 2019 9:15 am
Forum: General discussion
Topic: Back Voltage from USB Hub
Replies: 19
Views: 563

Re: Back Voltage from USB Hub

I didnt have to supply power to the Pi, merely plugging a powered hub into the USB socket of the Pi powered it up. Did you connect the hub using one of the output ports (in which case, the behavior is expected for the Pi you've indicated), or was it by connecting the hub's uplink connection? The fo...
by geffers
Tue Sep 17, 2019 11:59 pm
Forum: General discussion
Topic: Back Voltage from USB Hub
Replies: 19
Views: 563

Re: Back Voltage from USB Hub

On a positive note, you could use one of the hub's USB ports and power a pi with that. As long as the powered hub gets more than 2,5A at 5V (1A at 12V) on the input, you can save cables there. (Meaning using data connection + power connection to the hub, for a more stable power). The problems usual...
by geffers
Tue Sep 17, 2019 11:55 pm
Forum: General discussion
Topic: Back Voltage from USB Hub
Replies: 19
Views: 563

Re: Back Voltage from USB Hub

As I am interested in acquiring a powered USB hub I have followed this thread, but I'm still not clear on whether the Pi Hut accessory is not back-powering the Pi. It was definitely back powering, the hub had a PSU plugged in, I connected the hub's input plug to the Pi's USB socket, no PSU was conn...
by geffers
Tue Sep 17, 2019 11:50 pm
Forum: General discussion
Topic: Back Voltage from USB Hub
Replies: 19
Views: 563

Re: Back Voltage from USB Hub

hippy wrote:
Thu Sep 12, 2019 11:15 am
geffers wrote:
Thu Sep 12, 2019 8:47 am
I was very surprised when the Pi booted up as soon as I connected the hub to the Pi.
You don't mention which model of Pi you have so it is hard to tell if you should have been surprised or not.
Only two USB ports so a very early one.

Geffers
by geffers
Tue Sep 17, 2019 11:50 pm
Forum: General discussion
Topic: Back Voltage from USB Hub
Replies: 19
Views: 563

Re: Back Voltage from USB Hub

Burngate wrote:
Thu Sep 12, 2019 10:06 am

Would it be possible to open the hub and cut the 5v trace to the input socket?
I'll use it just as a passive hub.

Geffers
by geffers
Tue Sep 17, 2019 11:47 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: PC Version wont boot
Replies: 2
Views: 89

Re: PC Version wont boot

Andyroo wrote:
Tue Sep 17, 2019 12:11 pm
The installer is the standard Debian installer that asks for the disk to put the OS on and the grub location with a check for dual boot...

Best thing I can think of is to search for menu.lst to find one that matches :cry:
Dont think menu.lst exists any more.

Geffers
by geffers
Tue Sep 17, 2019 11:34 am
Forum: Raspberry Pi Desktop for PC and Mac
Topic: PC Version wont boot
Replies: 2
Views: 89

PC Version wont boot

Folks, Experimenting with Linux distros I installed the RaspberryPi Desktop for PC version onto an external SATA hard drive. I've also go Ubuntu-Mate and Fedora KDE installed, both work fine. Installation all appeared to go OK but I don't recall being asked about location of GRUB and it seems it ins...
by geffers
Thu Sep 12, 2019 8:47 am
Forum: General discussion
Topic: Back Voltage from USB Hub
Replies: 19
Views: 563

Re: Back Voltage from USB Hub

It was never my intention to use it to power the Pi. I was very surprised when the Pi booted up as soon as I connected the hub to the Pi. Initially I was impressed with this device as it had both the conventional 'A' connector plus a micro USB so could be used on Zero without adapters. Not so sure n...
by geffers
Wed Sep 11, 2019 7:24 pm
Forum: General discussion
Topic: Back Voltage from USB Hub
Replies: 19
Views: 563

Back Voltage from USB Hub

Folks, I recall in the early Pi days they mentioned 'back voltage' from USB hubs was an issue and that R-Pi recommended hubs had no 'back voltage'. I recently purchased a 4 port hub from Pi Hut, it can work as a passive hub as well as powered, I recently discovered that if you power this hub and the...
by geffers
Tue Aug 27, 2019 11:36 am
Forum: General discussion
Topic: Change root in cmdline.txt
Replies: 14
Views: 1513

Re: Change root in cmdline.txt

Which model PI? What OS? What are you using for a power supply? What kind of drive are you attempting to load the OS from? It was only an experiment but for your info; Pi Model 2B (Not 2B+) Buster-lite Raspberrypi 2.5 Amp PSU Copied the new Ext4 partition of a working installation from MicroSD card...
by geffers
Tue Aug 27, 2019 11:21 am
Forum: General discussion
Topic: dd won't copy
Replies: 6
Views: 253

Re: dd won't copy

Raspbian Buster with Desktop includes SD Card Copier, to clone the SD Card to another in a USB SD Card Reader, providing it has enough space ! If you are running in Cli only then try: https://github.com/billw2/rpi-clone/blob/master/README.md Thanks for info - I know microSD cards are not the greate...
by geffers
Tue Aug 27, 2019 11:14 am
Forum: General discussion
Topic: dd won't copy
Replies: 6
Views: 253

Re: dd won't copy

Any recommendations? Cut and paste here from the terminal when you try the commands, so we see exactly what you try and the exact error message. Your chances for getting useful help is multiplied by 10. Not sure this is going to help but here it is; sudo dd if=/dev/mmcblk0 of=Backup-27Aug19.img bs=...
by geffers
Fri Aug 23, 2019 9:48 pm
Forum: General discussion
Topic: dd won't copy
Replies: 6
Views: 253

dd won't copy

Folks, I have Raspian desktop installed on a Pi3, all seems to be working fine. Connected to a TV and displays as expected, as no KB or mouse I do maintenance via ssh. I occasionally run apt-get update then upgrade which all completes successfully. Today I wanted to back up the drive so extracted fr...
by geffers
Tue Aug 20, 2019 10:08 pm
Forum: General discussion
Topic: Change root in cmdline.txt
Replies: 14
Views: 1513

Re: Change root in cmdline.txt

thagrol wrote:
Sat Aug 17, 2019 11:19 am
graysky wrote:
Sat Aug 17, 2019 11:05 am
I think there is a kernel parameter you need to change as well.
Not in my experience. /boot/cmdline.txt and /etc/fstab on the new partition is all I've ever had to change.
Thanks, that worked spot on. Soon as I altered fstab it worked fine.

Geffers
by geffers
Sat Aug 17, 2019 10:12 am
Forum: General discussion
Topic: Change root in cmdline.txt
Replies: 14
Views: 1513

Re: Change root in cmdline.txt

Now obviously I've done something wrong then. I copied the actual ext4 partition (not just files within, used gparted to copy partition) to an external drive, got the PARTUUID then checked ID same when plugged in the the Pi. Then deleted the ext4 partition on the SD card having altered the location ...
by geffers
Fri Aug 16, 2019 4:35 pm
Forum: General discussion
Topic: Change root in cmdline.txt
Replies: 14
Views: 1513

Change root in cmdline.txt

Folks, Think I misunderstood something some time back that I read in an article somewhere. In the cmdline.txt file in the /boot directory there is an entry as follows; root=PARTUUID=c82337fe-02 which seems to allow setting the root directory to a different location. Now I am thinking you need the op...
by geffers
Wed Jul 31, 2019 4:10 pm
Forum: General discussion
Topic: Script files disappear from Home Directory
Replies: 3
Views: 173

Script files disappear from Home Directory

Folks, Been driving myself mad here. Trying to set something up on my Raspberry Pi I created a couple of scripts in my home directory to easily configure some settings on reboot. Every time I reboot the script files disappear from my home directory. I am baffled what is happening here, it only seems...
by geffers
Wed Jul 31, 2019 8:07 am
Forum: General discussion
Topic: Servers Power Consumption
Replies: 4
Views: 241

Servers Power Consumption

Curious folks, If a server is installed is it consuming any power when idle or is it mainly just when serving services? I'm guessing when idle power consumption is probably extremely low but increases under load. Reason for enquiry is basically CPU temperature, seems very important with Pi4 and am w...
by geffers
Wed Jun 26, 2019 12:24 am
Forum: General discussion
Topic: Pricing of Pi models
Replies: 7
Views: 536

Re: Pricing of Pi models

All good points brought up.

Geffers
by geffers
Mon Jun 24, 2019 8:14 pm
Forum: General discussion
Topic: Pricing of Pi models
Replies: 7
Views: 536

Pricing of Pi models

Appreciating power consumption may be a factor but am wondering; the new 1GB Pi 4 is priced almost the same as a 1GB Pi 3+ so what would prompt someone to purchase a Pi 3+ I've still got a couple of Pi 1s (or the ones before the two) doing useful tasks, bought a couple of Zeros, again for simple but...
by geffers
Mon Jun 24, 2019 2:09 pm
Forum: General discussion
Topic: Temporary Router
Replies: 7
Views: 452

Re: Temporary Router

procount wrote:
Mon Jun 17, 2019 12:51 pm
Lede / Openwrt can also be installed on a RPi to turn it into a router. It's available for many devices. (also installable via PINN ;) )
Now the Pi 4 is out with gigabit ethernet this becomes a decent option.

Geffers
by geffers
Mon Jun 17, 2019 12:49 pm
Forum: General discussion
Topic: Temporary Router
Replies: 7
Views: 452

Re: Temporary Router

I'd rather suggest adding a bridge (possibly anonymous = sans IP address), in other words turn the Pi into a 2-port ethernet switch, that will see all the traffic pass through it without changing anything to the network setup. Great suggestion but for my minimal requirements might be too much. Thin...
by geffers
Mon Jun 17, 2019 12:47 pm
Forum: General discussion
Topic: Temporary Router
Replies: 7
Views: 452

Re: Temporary Router

On many routers you can install a linux-based open source firmware that then allows you to modify and install almost anything on them. The best known is https://dd-wrt.com/ but there is https://openwrt.org/ and https://advancedtomato.com/ with different capabilities. Yes, I've seen them, my present...

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