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by tvjon
Wed Sep 04, 2019 10:49 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: pi4 stupidity with mini-hdmi and port layouts
Replies: 3
Views: 166

Re: pi4 stupidity with mini-hdmi and port layouts

"who gives a pony about dual display"

I, along with several other RPi users I know, have used dual displays on RPi's since RPI2, for the last 5 years or so. It's a very useful feature for many situations, including education, especially when one of those displays can be a cheap vga screen.
by tvjon
Sat Aug 24, 2019 12:35 pm
Forum: General discussion
Topic: Help using this forum please!
Replies: 16
Views: 582

Re: Help using this forum please!

Ok, I'll upload a jpeg from my µSD card (or HD) thus: Left click on File selector in the Options panel below this submission window, & choose your file. I usually then click on Place inline (after my cursor postion) I never use an online file site, as they can disappear, so as long as the Foundation...
by tvjon
Fri Aug 23, 2019 3:26 pm
Forum: Troubleshooting
Topic: scrot -s on Raspberry pi 4 doesn't work well
Replies: 9
Views: 275

Re: scrot -s on Raspberry pi 4 doesn't work well

Thanks to this post from ShiftPlusOne:

https://www.raspberrypi.org/forums/view ... 6&t=249650

The big upgrade he links to has fixed this particular problem, along with the associated artifacts on dragging to open a window.
by tvjon
Mon Aug 12, 2019 12:32 pm
Forum: Troubleshooting
Topic: scrot -s on Raspberry pi 4 doesn't work well
Replies: 9
Views: 275

Re: scrot -s on Raspberry pi 4 doesn't work well

LaginaPi's observation on a Pi4 is correct, as shown in the attached picture. Dragging windows around on Pi4 results in artifacts around the origin, similar to RPi1 window dragging. With successive Rpi-updates, it has improved somewhat, but is still evident, along with several % increase in cpu usag...
by tvjon
Mon Aug 05, 2019 7:27 pm
Forum: Graphics programming
Topic: HEVC/H265 Decoding
Replies: 23
Views: 1860

Re: HEVC/H265 Decoding

... IL deceased or on it's way definitely has simplicity as a merit. Agreed, after all the effort to try to understand it, seems such a waste... ... There is a MMAL wrapper around libavcodec (the libav fork annoyingly), so it may be possible to pull FFmpeg into MMAL pipelines. ... Apparently, in ff...
by tvjon
Sun Jul 14, 2019 12:43 pm
Forum: Troubleshooting
Topic: Extremly Poor performance with tvout enabled
Replies: 13
Views: 806

Re: Extremly Poor performance with tvout enabled

.... which i cant test against w/ HDMI as my Micro cable wont be here for another day or so, Raspbian Buster takes upwards to 8 Mins to fully boot! ... Composite was my first sighting of booting Pi4 as the courier managed to take an unscheduled extra day to deliver my µHDMI cables too! Not 8 min's ...
by tvjon
Tue Jul 09, 2019 10:30 am
Forum: General discussion
Topic: Raspberry Pi 4 Dual Monitors
Replies: 43
Views: 6279

Re: Raspberry Pi 4 Dual Monitors

I see that arandr has has been updated, along with a firmware fix to re-enable Composite video on RPi3. ... No change in findings for pure hdmi connections, however... Is there further information available regarding the "less capable" HDMI1 output? I eliminated the possibility of a faulty Pi4 by t...
by tvjon
Thu Jul 04, 2019 9:40 am
Forum: General discussion
Topic: Raspberry Pi 4 Dual Monitors
Replies: 43
Views: 6279

Re: Raspberry Pi 4 Dual Monitors

Thank you for that insight. I imagine a lot of posts exist because their authors are unaware of just how much effort is required to overcome what are sometimes industry self inflicted problems.
by tvjon
Thu Jul 04, 2019 8:48 am
Forum: General discussion
Topic: Raspberry Pi 4 Dual Monitors
Replies: 43
Views: 6279

Re: Raspberry Pi 4 Dual Monitors

I see that arandr has has been updated, along with a firmware fix to re-enable Composite video on RPi3. So, having installed those, I`ve tried yet again connecting a second HDMI monitor to HDMI1. Select Screen Configuration. Both monitors are showing the desktop, but the wrong relative orientation f...
by tvjon
Tue Jul 02, 2019 2:17 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 - new VLI firmware issues
Replies: 69
Views: 15399

Re: Raspberry Pi 4 temperature

$ sudo hdparm -t /dev/sda1

/dev/sda1:
Timing buffered disk reads: 2 MB in 30.24 seconds = 67.73 kB/sec
by tvjon
Tue Jul 02, 2019 1:05 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 - new VLI firmware issues
Replies: 69
Views: 15399

Re: Raspberry Pi 4 temperature

jdb wrote:
Tue Jul 02, 2019 12:38 pm
Are there any errors in dmesg after the drive's been accessed in a slow fashion?
by tvjon
Tue Jul 02, 2019 11:54 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 - new VLI firmware issues
Replies: 69
Views: 15399

Re: Raspberry Pi 4 temperature

It seems to vary wildly with the drive! Toshiba 2.5" integrated USB3: /dev/sdb1: LABEL="tosh" UUID="72ACD728ACD3E61F" TYPE="ntfs" PTTYPE="atari" PARTUUID="9235e1ef-01" $ sudo hdparm -t /dev/sdb1 /dev/sdb1: Timing buffered disk reads: 314 MB in 3.01 seconds = 104.44 MB/sec Seagate Barracuda 3.5" (muc...
by tvjon
Tue Jul 02, 2019 9:50 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 529
Views: 132567

Re: Raspberry Pi 4 temperature

For the past couple of years or so, I`ve had 2 RPi3b`s mounted vertically as in attached pic`. I recently replaced 1 of them with a Pi4 as I intend to do some big GCC builds with it. The next Pi4 I buy though will run with no heatsink or fan, & I do not anticipate any problems. $ vcgencmd measure_te...
by tvjon
Fri Jun 28, 2019 4:25 pm
Forum: Graphics, sound and multimedia
Topic: Buster+dpi screen+hdmi screen on 3b
Replies: 8
Views: 700

Re: Buster+dpi screen+hdmi screen on 3b

... DPI is not a detectable interface, therefore if you have added enable_dpi_lcd=1 in config.txt then it will be enabled. Yes, I understand that. The same goes for Composite, neither interface has any means of feedback to the interface, but just seems strange to say "default" when at least Pi does...
by tvjon
Fri Jun 28, 2019 1:30 pm
Forum: Other projects
Topic: New AirPlay Mirroring Server (Open Source)
Replies: 16
Views: 11382

Re: New Open Source AirPlay Mirroring Server

...Thanks for your feedback! Great to hear someone is using the program! You're welcome. In fact, I have some more. I was pondering whether to go to Github, or perhaps you'd prefer feedback here? Github obviously has mechanism in place for all this, but I suspect more people read the (sub) forums, ...
by tvjon
Fri Jun 28, 2019 11:28 am
Forum: Troubleshooting
Topic: Trouble Getting HDMI Output From RPi4
Replies: 43
Views: 4198

Re: Trouble Getting HDMI Output From RPi4

...Do I need to return this Pi while it is still within the returns policy? .. From my limited exposure to Pi4 so far (thanks to UPS) I'd say it's extremely unlikely to be the Pi4. You mention "Samsung TV". Does this TV have a composite input? Thanks to UPS again, I've initially used a 4 on a Samsu...
by tvjon
Fri Jun 28, 2019 9:36 am
Forum: General discussion
Topic: Charger compatibility with the Pi 4 (Single Type C CC resistor on Pi4)
Replies: 28
Views: 4523

Re: Charger compatibility with the Pi 4 (Single Type C CC resistor on Pi4)

One Qualcomm QC3.0 supply I have works fine, from either its USB A or C sockets. $ vcgencmd measure_temp temp=54.0'C $ vcgencmd measure_volts volt=0.8455V However an Anker psu also with 2 sockets, fails from its USB C output but using an USB-A to C lead works fine from its A socket. $ vcgencmd measu...
by tvjon
Thu Jun 27, 2019 8:57 am
Forum: Graphics, sound and multimedia
Topic: Buster+dpi screen+hdmi screen on 3b
Replies: 8
Views: 700

Re: Buster+dpi screen+hdmi screen on 3b

It appears that it's possible to lock oneself out using arandr. There are several permutations for the 2 screen (in my test case HDMI & DPI interface) setup. At least 1 of these means if the DPI screen is not present (perhaps someone borrowed it) there's no easy way to persuade PI3b to use what is c...
by tvjon
Tue Jun 25, 2019 10:03 pm
Forum: Graphics, sound and multimedia
Topic: Buster+dpi screen+hdmi screen on 3b
Replies: 8
Views: 700

Re: Buster+dpi screen+hdmi screen on 3b

... Did you add "max_framebuffers=2" to config.txt? It's the default for pi4, but not on earlier boards. Without that you will only ever get a single /dev/fbN. I didn't, but commenting out [Pi4] has now produced fb1 too, thank you. HDMI screen is about 1/4 occupied by a desktop picture, whilst DPI ...
by tvjon
Tue Jun 25, 2019 9:21 pm
Forum: Graphics, sound and multimedia
Topic: Buster+dpi screen+hdmi screen on 3b
Replies: 8
Views: 700

Re: Buster+dpi screen+hdmi screen on 3b

With 2 displays, the second to be initialised will show magenta instead of red in the top left for the rainbow screen. It should be that in legacy mode you get 2 framebuffer device (/dev/fb0 and /dev/fb1), and I would hope that display_default_lcd would swap them around. ... Useful to know, thank y...
by tvjon
Tue Jun 25, 2019 6:26 pm
Forum: Graphics, sound and multimedia
Topic: Buster+dpi screen+hdmi screen on 3b
Replies: 8
Views: 700

Buster+dpi screen+hdmi screen on 3b

Using the new Buster desktop image on this RPi3b results in odd behaviour... Extracted from /boot/config.txt # display_default_lcd=0 # #dtoverlay=vga666 # dtoverlay=dpi18 # enable_dpi_lcd=1 # dpi_group=2 # dpi_mode=39 [pi4] ... Every reboot results in the attached picture (note its colours) appearin...
by tvjon
Mon Jun 24, 2019 10:30 am
Forum: Graphics, sound and multimedia
Topic: Audacity/Microphone - Raspberry Pi 3.
Replies: 8
Views: 686

Re: Audacity/Microphone - Raspberry Pi 3.

"So sorry to get back to you slowly, Its been manic here just getting round to to your advice." Not to worry. I'm busy too :) Ctrl c to stop recording via the console command line. I only have experience of audacity on Rpi's. I have no wintel kit, only RPi's & iOS. As you can see from the attached s...
by tvjon
Tue Jun 18, 2019 7:20 am
Forum: Graphics, sound and multimedia
Topic: Fluidsynth and jackd on RPI3 (raspbian) - broken audio via headphone jack
Replies: 1
Views: 423

Re: Fluidsynth and jackd on RPI3 (raspbian) - broken audio via headphone jack

Hi, I am running raspbian and I want to use fluidsynth to make a portable midi setup to connect to my usb midi keyboard. ... I am running from text linux to minimize the latency, so I don't even start X server to use fluidsynth; but it seems that it is not enough I wouldn't use jackd for that job. ...
by tvjon
Mon Jun 17, 2019 12:42 pm
Forum: Graphics, sound and multimedia
Topic: Audacity/Microphone - Raspberry Pi 3.
Replies: 8
Views: 686

Re: Audacity/Microphone - Raspberry Pi 3.

...t is an proper good investment - i know i was looking at buying some Pi cameras so kids could build and code a security system that emails photos on detection - the PS3 camera (might) be able to do similar. ... Well, that's the point really. Some of the folk I encounter don't have 2 (half) penni...

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