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by bjtheone
Fri Aug 30, 2019 12:08 pm
Forum: Troubleshooting
Topic: Saving to a folder in a USB stick
Replies: 6
Views: 373

Re: Saving to a folder in a USB stick

Read up on how permissions work to understand why. Remember that Raspbian is a version/variant of Debian, which is a flavor of Linux. It is a multi user system, even if you are only every using a single default user (pi). As you found out, it matters which type of file system you are mounting and wh...
by bjtheone
Thu Aug 29, 2019 8:42 pm
Forum: General discussion
Topic: cables and casing
Replies: 5
Views: 963

Re: cables and casing

Pi 4B supports bluetooth so certainly can support a bluetooth mouse/keyboard. The only caveat I would add is that RF tends to work better, and is much better supported in Linux. It happily recognizes all my RF USB dongles. While I have not played with bluetooth on the Pi for mice and keyboards I hav...
by bjtheone
Thu Aug 29, 2019 8:33 pm
Forum: General discussion
Topic: Can i upgrade LPDDR4 4GB or 8GB form RPi4 (2GB)?
Replies: 32
Views: 4065

Re: Can i upgrade LPDDR4 4GB or 8GB form RPi4 (2GB)?

The one thing I have learned over the last 40+ years of mucking about with computers is that there is no such thing as "too much". This is especially true for devices with non upgradeable bits. For something like a laptop I can trade off sunk costs against potential future needs, and figure if I sho...
by bjtheone
Thu Aug 29, 2019 2:50 pm
Forum: General discussion
Topic: Raspberry Pi 4 overheat : why not underclocking a little ?
Replies: 26
Views: 10637

Re: Raspberry Pi 4 overheat : why not underclocking a little ?

In the media center application you have three conflicting issues: 1) Environment - closed cabinet with other heat sources, which may raise local ambient significantly above "room" temperature. 2) Always on, appliance like functionality, plus relatively high loads when streaming 3) Noise sensitivity...
by bjtheone
Thu Aug 29, 2019 2:12 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 574
Views: 220173

Re: Raspberry Pi 4 usb boot?

Its a toMAYtoe toMAtoe kinda thing. PXE is a specific type of network boot. The end result is boot over a network. And it was over things other than ethernet. I still have nasty flashbacks to token ring networks....
by bjtheone
Wed Aug 28, 2019 11:56 am
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 574
Views: 220173

Re: Raspberry Pi 4 usb boot?

It may be important at some point in time for a company to stop pulling rabbits out of a hat and provide a roadmap for future products that business partners and school boards can rely on. After more than five successful product releases, the reputation of the team behind the Raspberry Pi is well-e...
by bjtheone
Wed Aug 28, 2019 11:28 am
Forum: General discussion
Topic: Can i upgrade LPDDR4 4GB or 8GB form RPi4 (2GB)?
Replies: 32
Views: 4065

Re: Can i upgrade LPDDR4 4GB or 8GB form RPi4 (2GB)?

I used to have access to industrial grade, state of the art, reflow and rework equipment (telecom manufacturer). I suspect that is not particularly rare as I suspect lots of Pi users are engineering types. Certainly have done more complex rework and repairs. Back in the dark ages of dips, I also bui...
by bjtheone
Tue Aug 27, 2019 12:47 am
Forum: Advanced users
Topic: How to see if wireless radio is powered off?
Replies: 1
Views: 603

Re: How to see if wireless radio is powered off?

What specifically is your concern. Are you trying to save power, or guarantee that wifi is not usable or what? I doubt that the actual chip is powered down. It certainly can be disabled (as in taking the interface down) and if you are really concern you could remove the functionality. "sudo iwconfig...
by bjtheone
Tue Aug 27, 2019 12:32 am
Forum: Beginners
Topic: Calibre Not Updating Pi 3
Replies: 7
Views: 491

Re: Calibre Not Updating Pi 3

Interesting.... I use Calibre a lot. When I setup the 4B I started with Buster Lite, added Mate desktop and then added Calibre via sudo apt-get install calibre Seems to have worked fine, and I am definitely running verison 3.39.1. sudo apt-cache showpkg calibre produces: Package: calibre Versions: 3...
by bjtheone
Mon Aug 26, 2019 4:47 pm
Forum: Troubleshooting
Topic: Out of memory error on RPi 4 when there's memory
Replies: 12
Views: 1980

Re: Out of memory error on RPi 4 when there's memory

Is it 11 GB total or a single 11 GB file that you are trying to rsync? Also what is the exact rsync command you are using?

I do know that using rsync to copy 15ish GB(across multiple files) works fine on Buster and the 4B since I have done it a bunch of times to setup a 4B/120 GB SSD configuration.
by bjtheone
Mon Aug 26, 2019 4:38 pm
Forum: Troubleshooting
Topic: No WiFi on a 4B-4GB with Raspbian Buster
Replies: 52
Views: 7613

Re: No WiFi on a 4B-4GB with Raspbian Buster

Under normal circumstances "it just works". More information about your setup would be useful. First off, what country are you in (matter for wireless connection only) and what is your internet source? Are you sure that it is wide open and accepting connections? The standard configuration of Buster ...
by bjtheone
Mon Aug 26, 2019 11:59 am
Forum: Beginners
Topic: Calibre Not Updating Pi 3
Replies: 7
Views: 491

Re: Calibre Not Updating Pi 3

That version of Calibre is in Stretch. I suspect you have not yet updated to Buster or your upgrade did not go particularly well. I can confirm the new version for Buster, since I am running it. Note: sudo apt-get upgrade << Updates to latest versions in current release you have installed sudo apt-g...
by bjtheone
Fri Aug 23, 2019 5:24 pm
Forum: Raspberry Pi OS
Topic: Raspbian Buster Desktop Fonts Hurt My Eyes
Replies: 10
Views: 2436

Re: Raspbian Buster Desktop Fonts Hurt My Eyes

The advantage of starting with Raspbian Lite is that you get a fairly safe base (Debian) with the ARM specific optimizations that RPT puts in when they package it up, so it all just works. Yes there are some compromises to support all Pi types but it is a much better starting place than say trying t...
by bjtheone
Fri Aug 23, 2019 12:43 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 574
Views: 220173

Re: Raspberry Pi 4 usb boot?

It is just that a bunch of folks have complained enthusiastically about the lack of "true" USB boot without coming up with any concrete reasons as to why they need USB boot (no SD card) versus just booting from the SD card with the entire root fs on USB storage. I suspect this has somewhat sensitize...
by bjtheone
Fri Aug 23, 2019 12:14 pm
Forum: General discussion
Topic: unplug anytime ?
Replies: 21
Views: 1480

Re: unplug anytime ?

Hello, For one of my project (embedded rpi on motorbike), I used the following configuration on a single SDCard : - boot partition (fat) - root file system read-only (ext2 or ext4) - 2 btrfs partitions for user data, in raid mode, with 5 seconds cache (data are written to disk every 5 seconds, mirr...
by bjtheone
Fri Aug 23, 2019 2:37 am
Forum: Beginners
Topic: Bugs, Bugs, Bugs everywhere. Need Guidance here.
Replies: 5
Views: 641

Re: Bugs, Bugs, Bugs everywhere. Need Guidance here.

I would start over with a known good baseline (either Raspbian Lite if you are going to use a different Desktop, or RaspbianFull if you are ok with LXDE). It should work very well out of the box. Then make a list of the extras you want and install them one at a time, If you are applying tweak on top...
by bjtheone
Fri Aug 23, 2019 2:05 am
Forum: Beginners
Topic: Network Utility
Replies: 20
Views: 1315

Re: Network Utility

@fruitoftheloom, Well, there is talk of others using it for such, and it did find the ARM processor just fine during install, so perhaps I made a mistake of assuming all was good. But ARMHF..........? @rpdom, One must think it thru. There are only three version of Raspbian. I specifically mentioned...
by bjtheone
Fri Aug 23, 2019 1:38 am
Forum: Beginners
Topic: Raspberry Pi 4 usb power button/switch works how?
Replies: 4
Views: 2967

Re: Raspberry Pi 4 usb power button/switch works how?

I see some places selling power supplies for the Raspberry Pi 4 with a on/off button/switch. Sometimes with an LED. Example: CanaKit USB-C PiSwitch What is the button doing exactly? Does the Pi read the button status and shutdown? Are you supposed to watch the button in code and do something when i...
by bjtheone
Fri Aug 23, 2019 1:31 am
Forum: Beginners
Topic: Recommended USB/SSD hardware
Replies: 9
Views: 781

Re: Recommended USB/SSD hardware

So the enclosure I use is a: https://www.amazon.ca/Mediasonic-Drive-Enclosure-9-5mm-Aluminum/dp/B009DNIWKA "sudo lsusb -v " provides the following info: idVendor 0x2109 VIA Labs, Inc. idProduct 0x0711 bcdDevice 4.14 iManufacturer 1 VIA Labs,Inc. iProduct 2 USB3.0 SATA Bridge iSerial 3 000000000028 I...
by bjtheone
Thu Aug 22, 2019 12:39 pm
Forum: Beginners
Topic: Recommended USB/SSD hardware
Replies: 9
Views: 781

Re: Recommended USB/SSD hardware

From everything I have read the actual SSD does not seem to matter much. In a ultra high performance gaming laptop it likely does but for a Pi 4B attached over USB 3.0, pretty much any SSD delivers similar performance. I would suggest buying whatever name brand SSD is readily available and hopefully...
by bjtheone
Thu Aug 22, 2019 11:54 am
Forum: General discussion
Topic: wireless laptop-Pi network
Replies: 1
Views: 131

Re: wireless laptop-Pi network

Sure. Either the Pi or the laptop needs to be setup and running as a wireless access point (similar to who you can do this with most modern cellphones). The other device will connect to this wireless network. Lots of tutorials and how to's available, such as: https://www.raspberrypi.org/documentatio...
by bjtheone
Thu Aug 22, 2019 1:38 am
Forum: Troubleshooting
Topic: .desktop file asking what to do in Buster
Replies: 5
Views: 559

Re: .desktop file asking what to do in Buster

Just checking, in case the upgrade broke your python setup. Can you run then from the command line in a terminal via changing to the directory where the python programs are located and executing "python python_program_name"?
by bjtheone
Thu Aug 22, 2019 1:32 am
Forum: Troubleshooting
Topic: Raspberry Pi 3B+ - won't boot with keyboard and mouse attached
Replies: 25
Views: 1582

Re: Raspberry Pi 3B+ - won't boot with keyboard and mouse attached

A Pi 3B+ USB booting off a 128 Gb SSD with two wireless transceivers and a USB thumb drive also plugged in worked flawlessly for me, using the 2.5 A CanaKit power supply. That certainly sounds like a very similar setup to what you have. However, it likely depends on exactly which SSD and USB/SATA in...
by bjtheone
Thu Aug 22, 2019 1:14 am
Forum: Beginners
Topic: Will leaving my Pi on w/ fan connected be harmful?
Replies: 11
Views: 788

Re: Will leaving my Pi on w/ fan connected be harmful?

You really want the air blowing on to the Pi for most efficient cooling. Outside (cooler air) blowing on to the CPU or CPU heatsink and then exhausting out the sides. Note it is important to have a low airflow restriction path for air to get out, or you just over pressure the air in the case and don...
by bjtheone
Thu Aug 22, 2019 1:06 am
Forum: General discussion
Topic: unplug anytime ?
Replies: 21
Views: 1480

Re: unplug anytime ?

If you really care about the data, then an ext4 file system on an SD card is so not the way to go. If you really want it secure, you want some kind of redundant solution, ideally with an offsite copy/mirror/backup.

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