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by bjtheone
Tue Sep 03, 2019 5:21 pm
Forum: Advanced users
Topic: Under-voltage warnings
Replies: 209
Views: 368644

Re: Under-voltage warnings

You are confusing voltage and current (amperes) Don't blindly trust the label. The charger says it supplies 2A doesn't mean it supplies 5v while you're drawing 2A. As you draw more current, the voltage can drop and this is why you are seeing an 'undervolt' warning. Also, setting the clock to 1510MH...
by bjtheone
Tue Sep 03, 2019 1:58 pm
Forum: Beginners
Topic: Running GUI Program through Something like Putty
Replies: 7
Views: 810

Re: Running GUI Program through Something like Putty

If you want to use the "standard" GUI you need to have a display screen to attach to. You certainly can run a headless server and attach a remote screen to it. Lots of options there and putty know how to deal with remote X screens. Another option that many remote devices use is run a small webserver...
by bjtheone
Tue Sep 03, 2019 1:38 pm
Forum: General discussion
Topic: Pi 4 firmware, software stability improvements
Replies: 83
Views: 38114

Re: Pi 4 firmware, software stability improvements

there is a way to install something, a utility (compton? i dont know if is applicable on raspbian, im a total noob i try to learn now, after i buy a pi 4, just searched google) to fix the tearing issue on the raspberry pi 4? really drive me insane, you cannot look youtube content and keep have hori...
by bjtheone
Tue Sep 03, 2019 12:29 am
Forum: Beginners
Topic: How to use RSP in company
Replies: 25
Views: 2027

Re: How to use RSP in company

The lack of success may well be because companies are reluctant to tell anyone--and especially customers--that their Very Expensive machine is driven by a $35 computer. Customers might start questioning why the whole machine costs as much as it does. I have very expensive commercial equipment that ...
by bjtheone
Tue Sep 03, 2019 12:04 am
Forum: General discussion
Topic: Power Questions Part 2
Replies: 3
Views: 415

Re: Power Questions Part 2

Keep in mind that using the LM350, a linear regulator, with a voltage drop of 19-5=14 volts, the regulator will generate about three times as much heat as the Pi itself. Assuming a Pi4 at 500 mA idle current draw, that's 7 Watts of heat. Might be better off with a buck regulator, such as the LM2576...
by bjtheone
Mon Sep 02, 2019 11:35 pm
Forum: General discussion
Topic: Raspberry Pi 4 - boot problem (hybrid sd&ssd)
Replies: 22
Views: 2314

Re: Raspberry Pi 4 - boot problem (hybrid sd&ssd)

/dev/sdX is assigned in the order devices are found. A USB device that comes ready slower than another USB device is likely to be assigned a higher /dev/sdX (i.e. /dev/sdb instead of /dev/sda). Which USB ports you use also affects the assignment (exchanging devices in USB ports is likely to change ...
by bjtheone
Mon Sep 02, 2019 5:26 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 574
Views: 220173

Re: Raspberry Pi 4 usb boot?

If a sociable engineer posting for the first time claimed to have created a new EEPROM image that supported USB boot and gave a link here, how many people do you think would try it out? What if some virtual trolls posted that it actually worked and did indeed support USB boot? Sadly I don't agree w...
by bjtheone
Mon Sep 02, 2019 5:17 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 574
Views: 220173

Re: Raspberry Pi 4 usb boot?

Not sure anyone said it could not be done, what was said that it's not possible to brick it as you can ALWAYS recover the system to a known good state with the SD card with recovery.bin on it. And of course you do need superuser write to write to the EEPROM in the first place, but social engineer w...
by bjtheone
Mon Sep 02, 2019 4:47 pm
Forum: General discussion
Topic: Raspberry Pi 4 - boot problem (hybrid sd&ssd)
Replies: 22
Views: 2314

Re: Raspberry Pi 4 - boot problem (hybrid sd&ssd)

Just how fragile is using /dev/sdaX rather than PARTUUID? I have had no issues with having USB sticks connected (tried with FAT and ext4) to USB 2.0 ports with an SSD connected via a USB 3.0 port, at boot time. Probably 30+ reboots in the last month as I mucked about and it has always come up withou...
by bjtheone
Mon Sep 02, 2019 2:46 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 574
Views: 220173

Re: Raspberry Pi 4 usb boot?

If the EEPROM is writable and accessible it is hackable. To make use of "hackable" EEPROM on the pi4 one would need to: 1a) hack the os remotely and gain root access. or 1b) have local physical access 2) Have deep knowledge of VC4/6 hardware and software architecture and have knowledge of and acces...
by bjtheone
Sun Sep 01, 2019 4:09 pm
Forum: Advanced users
Topic: Need help with permissions after automount of usb storage?
Replies: 7
Views: 816

Re: Need help with permissions after automount of usb storage?

Did you switch from default user "pi" to something else during the config process? 1000 is the uid of the default user.
by bjtheone
Sun Sep 01, 2019 3:45 pm
Forum: Troubleshooting
Topic: RPI 4 Network issue
Replies: 6
Views: 405

Re: RPI 4 Network issue

Does the Pi boot up when not connected to the network? (no Ethernet, no WiFi). You should be able to boot up off a correctly flashed SD card and do the initial config. Once you have that done, and everything appears normal/sane, try plugging it in. Obviously use a known good cat5/6 Ethernet cable th...
by bjtheone
Sun Sep 01, 2019 3:31 pm
Forum: Beginners
Topic: XFCE - network manager applet not working
Replies: 4
Views: 1016

Re: XFCE - network manager applet not working

If you want XCFE rather than LXDE (the default with Raspbian) you are better off starting with Raspbian Lite and putting your desktop of choice on top of it. https://www.raspberrypi.org/forums/viewtopic.php?f=66&t=133691 The problem you are likely facing if you installed and setup Raspbain/LXDE and ...
by bjtheone
Sun Sep 01, 2019 3:02 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 574
Views: 220173

Re: Raspberry Pi 4 usb boot?

From a security point of view, it was reassuring that removing the SD card from previous models cleared the system of all possible malware. Thinking about the advanced ways a malware threat can become persistent by hiding in non-volatile on-board memory makes me want to purchase a stack of 3B+ comp...
by bjtheone
Sun Sep 01, 2019 2:42 pm
Forum: General discussion
Topic: Raspberry Pi Security
Replies: 26
Views: 1637

Re: Raspberry Pi Security

Fancy security stickers are a slightly more professional way to do this. Obviously will not prevent tampering but will deter/make it obvious if it has occurred. If you want to secure the SD the only real way is epoxy it in or encase the Pi in a barrier case and epoxy the case screws. Even then you a...
by bjtheone
Sun Sep 01, 2019 2:14 pm
Forum: General discussion
Topic: Power Questions Part 2
Replies: 3
Views: 415

Re: Power Questions Part 2

If you have enough power you certainly could split the output from your P/S and wire in a 19 V to 5 V converter to power the Pi, while still powering the amp with 19V. There are a bunch of ways to do this (basically the expense rising with the efficiency and quality of the converter output). In term...
by bjtheone
Sun Sep 01, 2019 12:01 am
Forum: Advanced users
Topic: Power Rpi4 with battery
Replies: 3
Views: 640

Re: Power Rpi4 with battery

On the off chance this is a FRC robot, you may want to also investigate setting up the OS as as read only as the Pi does not particularly like being repeatedly hard powered off.
by bjtheone
Sat Aug 31, 2019 11:49 pm
Forum: Troubleshooting
Topic: Wireless Access Point does not work
Replies: 4
Views: 432

Re: Wireless Access Point does not work

Just checking regarding your comment "I can't get another wlan connection from another computer". If you want your Pi to function as a wireless hotspot it is going to be using its wireless functionality to provide said hotspot (ie a place for downstream computer to connect to it using WiFi). If you ...
by bjtheone
Sat Aug 31, 2019 11:27 pm
Forum: Beginners
Topic: does the bluetooth chip on PI3 constasntly emits radiation?
Replies: 9
Views: 715

Re: does the bluetooth chip on PI3 constasntly emits radiation?

Absolutely true and that is the beauty of Free Software.... you can build it and perhaps they will come. Or you can lobby those that currently maintain the mainline Bluetooth solutions for a change in default functionality or those that build Raspbian. Or you can just uninstall if that is how you wa...
by bjtheone
Sat Aug 31, 2019 5:33 pm
Forum: Advanced users
Topic: Need help with permissions after automount of usb storage?
Replies: 7
Views: 816

Re: Stooopid newbie non understanding

The SSD is mounted by proper use of fstab :- proc /proc proc defaults 0 0 PARTUUID=a207fce3-01 /boot vfat defaults 0 2 PARTUUID=a207fce3-02 / ext4 defaults,noatime 0 1 # a swapfile is not a swap partition, no line here # use dphys-swapfile swap[on|off] for that The SSD is the ext4 partition mounted...
by bjtheone
Sat Aug 31, 2019 4:56 pm
Forum: Beginners
Topic: does the bluetooth chip on PI3 constasntly emits radiation?
Replies: 9
Views: 715

Re: does the bluetooth chip on PI3 constasntly emits radiation?

Consider the other user case... Joe Random user fires up his shiny new Pi and Bluetooth or WiFi does not work as it is not turned on, and then gets very frustrated/upset/angry because it is "broken". I think the default of on/enabled, given that the product claims to have both Bluetooth and WiFi, is...
by bjtheone
Sat Aug 31, 2019 4:32 pm
Forum: General discussion
Topic: Micro SD card size
Replies: 7
Views: 670

Re: Micro SD card size

The key call out is file management. As you noted, a great plan is to put all your user and application data files in a sane place, with some forethought as to structure. The only advantage a separate partition give you is that you can control the max size of file systems (ie stop a rouge user or pr...
by bjtheone
Sat Aug 31, 2019 4:11 pm
Forum: General discussion
Topic: Which SSD to buy for raspberry pi?
Replies: 60
Views: 20088

Re: Which SSD to buy for raspberry pi?

and a Kinston A400 SSD gets: HDParm Disk Read 278.91 MB/s HDParm Cached Disk Read 195.22 MB/s DD Disk Write 180 MB/s FIO 4k random read 18285 IOPS (73142 KB/s) FIO 4k random write 9120 IOPS (36480 KB/s) IOZone 4k read 20838 KB/s IOZone 4k write 24145 KB/s IOZone 4k random read 20664 KB/s IOZone 4k r...
by bjtheone
Fri Aug 30, 2019 5:38 pm
Forum: Troubleshooting
Topic: Kodi playback is choppy and laggy 400% kodi.bin usage
Replies: 14
Views: 3004

Re: Kodi playback is choppy and laggy 400% kodi.bin usage

Some cheap heatsinks use non-thermal attachment methods (basically generic double sided tape). This tape actually acts as an insulator between the cpu and heatsink, such that you get worse thermal performance than with just a plain cpu. Good heatsinks use special (read expensive) thermal tape that h...
by bjtheone
Fri Aug 30, 2019 5:15 pm
Forum: Troubleshooting
Topic: No audio on 2nd HDMI port RPi4 - trying to play VLC video
Replies: 4
Views: 616

Re: No audio on 2nd HDMI port RPi4 - trying to play VLC video

Just in case it is not clear, you can only select 1 "channel" for audio at a time and with the Pi 4B there are 3 (analog jack, HDMI 0, and HDMI1). The default HDMI port is HDMI0 (the one closest to the USB-C power port). This is true for HDMI video and audio.

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