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by knute
Sat Aug 15, 2020 2:44 am
Forum: Troubleshooting
Topic: Kernel won't roll back with rpi-update?
Replies: 6
Views: 370

Kernel won't roll back with rpi-update?

I have one of those small 3.5 inch video screens on one of my Pi4s and it stopped working with the 5.4.0 kernel. I used this command to roll back the kernel to 4.19.118: sudo rpi-update e1050e94821a70b2e4c72b318d6c6c968552e9a2 and it worked fine. But now when I run that command rpi-update says: pi@h...
by knute
Sat Aug 15, 2020 2:28 am
Forum: Java
Topic: Java Core dump failure
Replies: 3
Views: 1093

Re: Java Core dump failure

I had the same problem and it appears to be something with the amount of video memory. Try increasing it and see if that fixes the problem.
by knute
Thu Aug 06, 2020 2:47 pm
Forum: Troubleshooting
Topic: Just updated and vlc is gone?
Replies: 3
Views: 173

Re: Just updated and vlc is gone?

Thanks, installing it did bring it back.
by knute
Thu Aug 06, 2020 12:58 am
Forum: Troubleshooting
Topic: Just updated and vlc is gone?
Replies: 3
Views: 173

Just updated and vlc is gone?

I just did update and there were a lot of vlc related libraries and vlc is nowhere to be found now. I know there are some issues with this but how do I get it back in some version or condition?

Thanks.
by knute
Wed Aug 05, 2020 11:57 pm
Forum: Raspberry Pi OS
Topic: Do not upgrade VLC [solved]
Replies: 32
Views: 3500

Re: Do not upgrade VLC [solved]

I just updated, not knowing any of this, and vlc is gone. No longer in the menus or available on command line. How do I get it back?
by knute
Sun Aug 02, 2020 3:41 pm
Forum: General discussion
Topic: LCD35
Replies: 11
Views: 1575

Re: LCD35

I managed to get my other one working by installing new 5/27 RPiOS, rebooting, running the rpi-update rollback command, and rebooting again. Not sure why I couldn't get it to work before.
by knute
Sat Aug 01, 2020 7:20 pm
Forum: General discussion
Topic: LCD35
Replies: 11
Views: 1575

Re: LCD35

I've got two brands of those little screens that don't work with the 5.4 kernel. One is a Waveshare and the other is an goodtft/LCDwiki(?). The only fix I found was to go back to the 4.19 kernel. I managed to do that with rpi-update on one but the other I had to burn a new card with the 05/27 Raspbi...
by knute
Thu Jul 30, 2020 10:47 pm
Forum: General discussion
Topic: Notepad++
Replies: 51
Views: 7573

Re: Notepad++

I've got wine on my Xubuntu box and Notepad++. Seems to work fine. I think it would work on a Pi too. Well... Aside from the fact that Notepad++ is written to run on an x86 hardware architecture and Pis use ARM architecture... Yes you need an emulator too. https://www.youtube.com/watch?v=cb-Ruos-O2...
by knute
Thu Jul 30, 2020 7:25 pm
Forum: Troubleshooting
Topic: PI 4 8gig no sound ever
Replies: 2
Views: 163

Re: PI 4 8gig no sound ever

Are you running the 5.4 kernel and the vc4-kms-v3d overlay?
by knute
Thu Jul 30, 2020 7:14 pm
Forum: General discussion
Topic: Notepad++
Replies: 51
Views: 7573

Re: Notepad++

I've got wine on my Xubuntu box and Notepad++. Seems to work fine. I think it would work on a Pi too.
by knute
Wed Jul 29, 2020 10:24 pm
Forum: Troubleshooting
Topic: Pi 4 no sound
Replies: 3
Views: 307

Re: Pi 4 no sound

Do you have the 5.4 kernel and the vc4-kms-v3d overlay?
by knute
Fri Jul 24, 2020 2:46 pm
Forum: Beginners
Topic: Questions about programming on the Raspberry Pi [spam]
Replies: 10
Views: 648

Re: Questions about programming on the Raspberry Pi

If you are used to C# I would just use Java. But then I would use Java anyway :-).
by knute
Thu Jul 23, 2020 8:09 pm
Forum: Troubleshooting
Topic: allo piano 2.1 dac , no audio after updating kernel to 5.4.51
Replies: 4
Views: 324

Re: allo piano 2.1 dac , no audio after updating kernel to 5.4.51

I found a problem with the vc4-kms-v3d overlay and the new kernel was stopping my audio. You might check to see if that is enabled in your /boot/config.txt file. The fkms version works and no overlay works.
by knute
Wed Jul 22, 2020 3:11 pm
Forum: Troubleshooting
Topic: 5.4 kernel audio stopped and Pi freezes - Update!
Replies: 0
Views: 132

5.4 kernel audio stopped and Pi freezes - Update!

So I had two problems with the new kernel on my 3B+. First I was getting screen freezes. I would look away from the Pi for a bit and the screen would be black. No response to mouse and I couldn't SSH in from another computer. I'm not sure this is resolved but it may be related to the next problem. A...
by knute
Tue Jul 21, 2020 11:03 pm
Forum: Troubleshooting
Topic: allo piano 2.1 dac , no audio after updating kernel to 5.4.51
Replies: 4
Views: 324

Re: allo piano 2.1 dac , no audio after updating kernel to 5.4.51

I'm seeing the same problem, no audio after kernel 5.4. I installed 5.4 through apt.
by knute
Tue Jul 21, 2020 10:54 pm
Forum: Beginners
Topic: Creating GUI to control GPIO using qt 3d studio
Replies: 3
Views: 157

Re: Creating GUI to control GPIO using qt 3d studio

I wrote one in Java that you could modify: http://pi.knutejohnson.com
by knute
Tue Jul 21, 2020 10:43 pm
Forum: Java
Topic: 64-bit Java on RPi4
Replies: 6
Views: 2599

Re: 64-bit Java on RPi4

bell-sw.com
by knute
Tue Jul 21, 2020 10:34 pm
Forum: Advanced users
Topic: Moving Linux Kernel to 5.4
Replies: 474
Views: 91975

Re: Moving Linux Kernel to 5.4

The new kernel has killed my little 3.5 inch displays. Apparently their drivers aren't compatible with 5.4. I reverted the kernel with rpi-update and that solves the display issues for now. I emailed the maker and if I hear back on a solution I'll post it here.
by knute
Sun Jul 19, 2020 8:13 pm
Forum: Automation, sensing and robotics
Topic: Remote Wireless Temperature Sensor
Replies: 2
Views: 419

Re: Remote Wireless Temperature Sensor

I think the simplest way would be to have your Pi send the data to the web server by whatever means you normally use to upload content. I wrote some software for a Pi that gets a photograph and data from a mountain top radio repeater site, creates a composite image with the photo and the sensor data...
by knute
Wed Jul 15, 2020 4:24 pm
Forum: Troubleshooting
Topic: pigpiod error message?
Replies: 13
Views: 746

pigpiod error message?

On occasion I get the following during shutdown or reboot:

A stop job is running for Daemon required to control GPIO pins via pigpio (... / 1min 30s)

Raspberry Pi 3B+
Latest up to date Raspi OS
pigpiod enabled at startup
by knute
Wed Jul 08, 2020 6:56 pm
Forum: Beginners
Topic: FTP server -vsftpd show wrong time +3 from my time
Replies: 4
Views: 321

Re: FTP server -vsftpd show wrong time +3 from my time

I think it has to be a timezone problem. What timezone are you in? What are the contents of /etc/timezone? What is the output of the date command?

pi@raspberrypi3B-1:~ $ cat /etc/timezone
America/Chicago

pi@raspberrypi3B-1:~ $ date
Wed 08 Jul 2020 01:56:40 PM CDT
by knute
Tue Jul 07, 2020 3:50 pm
Forum: Beginners
Topic: FTP server -vsftpd show wrong time +3 from my time
Replies: 4
Views: 321

Re: FTP server -vsftpd show wrong time +3 from my time

I checked my installation of vsftpd running on a Pi3+. I tried sending a file to it from my Xubuntu desktop and the times are correct. You might check to make sure that there aren't timezone issues with either your client or server computer. Changing the use_localtime option to NO might help you to ...
by knute
Mon Jun 29, 2020 4:15 pm
Forum: Java
Topic: Java JIT availability on OpenJDK 11
Replies: 1
Views: 738

Re: Java JIT availability on OpenJDK 11

I like Azul's JDK because you can get it with JavaFX but I don't think it is any faster than OpenJDK. You can also look at Bell Software's JDK, bell-sw.com, it also has a version with JavaFX built in. The advantage of Bell's is that they have version 14 available with JavaFX for ARM.
by knute
Tue Jun 23, 2020 7:33 pm
Forum: Networking and servers
Topic: Help installing Oracle JDK 8/Airsonic
Replies: 7
Views: 495

Re: Help installing Oracle JDK 8/Airsonic

If it is the same package you have in your first post: sudo mv jdk-8u251-linux-arm32-vfp-hflt.tar.gz /opt cd /opt sudo tar xvf jdk-8u251-linux-arm32-vfp-hflt.tar.gz I think it will create a directory something like jdk-8_251. All of the programs are in jdk-8_251/bin. Create some links in your /home/...
by knute
Tue Jun 23, 2020 12:56 am
Forum: Networking and servers
Topic: Help installing Oracle JDK 8/Airsonic
Replies: 7
Views: 495

Re: Help installing Oracle JDK 8/Airsonic

Actually you've linked to Open Java which i'm trying to avoid as it hangs the boot for an hour apparently. This is why i've been at pains to get hold of the Oracle package. Since the license arrangements changed you can only get hold of it through a registered Oracle account which i've done so .. h...

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