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by with ice cream
Sat Jun 29, 2019 7:24 pm
Forum: Troubleshooting
Topic: Pi 4 Installation Issues (Solved)
Replies: 20
Views: 1347

Re: Pi 4 Installation Issues (Solved)

Thanks for chiming in. I‘m currently away from my Pi 4 and can‘t do further tests. Since this thread is marked as solved I recommend starting a new one.
by with ice cream
Fri Jun 28, 2019 3:34 pm
Forum: Troubleshooting
Topic: Pi 4 Installation Issues (Solved)
Replies: 20
Views: 1347

Re: Pi 4 Installation Issues (Solved)

Hmm, it should work in both, but HDMI 0 is preferred. I'm ran into a similar issue. I cannot use HDMI0 since the width of my HDMI adapter does not allow it. On the first boot with buster my display on HDMI1 worked. After updating the display stayed off. Now, the behavior is inconsistent. Sometimes ...
by with ice cream
Wed Jun 05, 2019 6:45 pm
Forum: Official Foundation Display
Topic: Control original blanker?
Replies: 2
Views: 328

Re: Control original blanker?

Perfect. Thank you, the 's' options work. The only remaining issue is that I cannot query the screen's state when I disable dpms. I'll experiment some more.
by with ice cream
Tue Jun 04, 2019 1:41 pm
Forum: Official Foundation Display
Topic: Control original blanker?
Replies: 2
Views: 328

Control original blanker?

Is there a way to control the original screen blanker? Is there a way to get the current state? /sys/class/backlight/rpi_backlight/bl_power doesn't seem to be related to the original screen blanking function. Currently, if I want to wake the screen without user interaction I simulate a mouse click w...
by with ice cream
Sat May 04, 2019 11:31 am
Forum: Advanced users
Topic: Kernel panic intepretation help needed
Replies: 10
Views: 514

Re: Kernel panic intepretation help needed

Well, I'm back. I disabled SD card polling as discussed above. Now the panics happen again: May 4 10:48:57 localhost kernel: [420987.124314] INFO: task kworker/3:1:7047 blocked for more than 120 seconds. May 4 10:48:57 localhost kernel: [420987.124326] Tainted: G C 4.14.98-v7+ #1200 May 4 10:48:57 l...
by with ice cream
Mon Apr 29, 2019 9:46 am
Forum: Advanced users
Topic: Kernel panic intepretation help needed
Replies: 10
Views: 514

Re: Kernel panic intepretation help needed

OK, the documentation explains that "poll_once=on" applies after boot. I'll try this and see if there are no more panics.
by with ice cream
Mon Apr 29, 2019 9:31 am
Forum: Advanced users
Topic: Kernel panic intepretation help needed
Replies: 10
Views: 514

Re: Kernel panic intepretation help needed

I believe this only changes the behaviour of the kernel once it is running, not the boot process. It makes sense. Enabling USB boot is something that is done once and sticks, disabling SD boot for good would be undesirable for most (unless we're talking hardening, but that's something for a differe...
by with ice cream
Mon Apr 29, 2019 9:21 am
Forum: Advanced users
Topic: Kernel panic intepretation help needed
Replies: 10
Views: 514

Re: Kernel panic intepretation help needed

rpdom wrote:
Mon Apr 29, 2019 9:16 am
It's as simple as adding an entry to /boot/config.txt and rebooting.
Thanks. For clarification: the boot process still checks the SD card first, even if it is disabled and only polling gets disabled? If USB booting fails I can still pop in a working SD card?
by with ice cream
Mon Apr 29, 2019 9:10 am
Forum: Advanced users
Topic: Kernel panic intepretation help needed
Replies: 10
Views: 514

Re: Kernel panic intepretation help needed

PeterO wrote:
Mon Apr 29, 2019 9:01 am
Maybe there is a problem with the sdcard interface...
That's an interesting perspective. fstab doesn't reference any SD card partitions.

How would one disable the SD interface? How would this be reversible?
by with ice cream
Mon Apr 29, 2019 8:58 am
Forum: Advanced users
Topic: Kernel panic intepretation help needed
Replies: 10
Views: 514

Re: Kernel panic intepretation help needed

Thanks, Peter, for the quick response. The Pi boots from a USB-connected SSD. The SSD is connected via a powered USB hub.There is no SD card in the slot.
by with ice cream
Mon Apr 29, 2019 8:49 am
Forum: Advanced users
Topic: Kernel panic intepretation help needed
Replies: 10
Views: 514

Kernel panic intepretation help needed

Every once in a while (no discernible pattern) my Pi 3B+ (4.14.98-v7+ #1200 SMP Tue Feb 12 20:27:48 GMT 2019) starts panicking: Apr 29 10:27:43 localhost kernel: [1027157.753964] INFO: task kworker/2:1:16365 blocked for more than 120 seconds. Apr 29 10:27:43 localhost kernel: [1027157.753979] Tainte...
by with ice cream
Wed Nov 22, 2017 7:42 am
Forum: General discussion
Topic: STICKY: USB boot now working on Pi3
Replies: 543
Views: 249566

Re: STICKY: USB boot now working on Pi3

Using pure USB boot on my Pi3 I am having problems with shutdown and/or reboot. Power-on booting is never an issue, but shutdown or reboot often fails with the system just hanging at the point when I would expect the shutdown to complete or reboot to start. I recently upgraded (still on Jessie, tho...
by with ice cream
Sun Mar 12, 2017 7:43 pm
Forum: Python
Topic: Stopwatch
Replies: 34
Views: 13630

Re: Stopwatch

please note you need to create the empty files using the files names in the code for this I came across your Stopwatch code and plan to adapt it to a solution with a 2.8" GPIO touch screen. It seems that simply touching the necessary files isn't enough. Would it be possible to provide an example? T...
by with ice cream
Sat Nov 12, 2016 8:27 pm
Forum: General discussion
Topic: STICKY: USB boot now working on Pi3
Replies: 543
Views: 249566

Cold boot vs. reboot

Cold USB booting (from no power) works, rebooting fails. Reproducible. I already activated the additional delay ('program_usb_boot_timeout=1' in config.txt) but that doesn't help. What else can I try? (Using an SD card with a cmdline that points to /dev/sda2 is my current workaround.)
by with ice cream
Fri Jul 01, 2016 4:55 pm
Forum: Troubleshooting
Topic: RPi3 Bluetooth and Wifi don't play well together
Replies: 55
Views: 19312

Re: RPi3 Bluetooth and Wifi don't play well together

A few days ago I started putting my Pi 3s bluetooth to use and noticed a serious decrease in wifi performance. Whenever I resolve a bluetooth device's name (to check for its presence) wifi ping times to the router go up from millseconds to full seconds. ssh sessions get dropped. Test it yourself: in...
by with ice cream
Thu Dec 03, 2015 3:47 pm
Forum: Beginners
Topic: How to give permissions to a file that works with dev/mem??
Replies: 12
Views: 1802

Re: How to give permissions to a file that works with dev/me

DougieLawson wrote:GPIO Zero which doesn't need sudo access or any fiddling with permissions for /dev/mem/.
I am in a similar situation. I user a cgi-bin python script and gpiozero but the error output mentions denied access to /dev/mem (for www-data).
by with ice cream
Sun Sep 20, 2015 12:06 am
Forum: Troubleshooting
Topic: MFRC522 + Raspberry Pi B+
Replies: 4
Views: 1638

Re: MFRC522 + Raspberry Pi B+

A few minutes later: solved for me. The key was this comment . The library works (best/only) with a Pi 2 with version 1.40. Here's what I did (I keep my sources in ~/src): cd ~/src/bcm2835-1.36 sudo make uninstall cd ~/src wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.40.tar.gz tar -zxf bcm2...
by with ice cream
Sat Sep 19, 2015 11:45 pm
Forum: Troubleshooting
Topic: MFRC522 + Raspberry Pi B+
Replies: 4
Views: 1638

Re: MFRC522 + Raspberry Pi B+

Not helpful, but I am in the same situation. I rewired everything twice, tried the python code that is floating around - no dice.
by with ice cream
Thu May 28, 2015 6:13 am
Forum: Raspbian
Topic: Kodi 15/16/17 Packages for Raspbian
Replies: 745
Views: 553356

Re: Kodi 15.0-beta Debian package for Raspbian on RPi 2

gkreidl wrote:Then reinstall kodi from the repository.
Thanks!
by with ice cream
Mon May 25, 2015 8:29 pm
Forum: Raspbian
Topic: Kodi 15/16/17 Packages for Raspbian
Replies: 745
Views: 553356

Re: Kodi 15.0-beta Debian package for Raspbian on RPi 2

Thanks for publishing the bleeding edge version. I am afraid that for me as a user of Mediaportal it isn't working. The add-on isn't compatible (it gets disabled and the following message appears in the log: "PVR - Add-on 'MediaPortal PVR Client' is using an incompatible API version. XBMC minimum AP...
by with ice cream
Fri Mar 06, 2015 3:04 pm
Forum: General programming discussion
Topic: Seeking recommendations for code management
Replies: 0
Views: 384

Seeking recommendations for code management

I have six Raspberry Pis, some running 24/7, and some to experiment. I dabble in bash, Python, JavaScript, and some perl. Usually before every firmware update or bigger changes I create images (on Windows) of my SD cards. I think I have a lot of unused ballast and unused scripts in my old installati...
by with ice cream
Wed Mar 04, 2015 7:40 pm
Forum: Troubleshooting
Topic: lirc-rpi on the RPi2
Replies: 38
Views: 24004

Re: lirc-rpi on the RPi2

For those still following: I found the cause of the LED flickering. It is an (unwanted) feedback loop. I started a new topic here.
by with ice cream
Wed Mar 04, 2015 7:36 pm
Forum: Troubleshooting
Topic: Issues with LIRC sending/receiving
Replies: 0
Views: 529

Issues with LIRC sending/receiving

[This started in a different thread but I started a new topic since I found the source of the issue.] In my setup (RPI2 with 3.18.8-v7+ #764) an LED flashes once when an IR sequence is received . Now when I send a sequence it gets at the same time picked up by the receiver and the LED starts flashin...
by with ice cream
Wed Mar 04, 2015 7:32 pm
Forum: Troubleshooting
Topic: RPI2 and GPIO issues [solved/explained]
Replies: 4
Views: 897

Re: RPI2 and GPIO issues

I found the reason for the issue what I am observing. In my setup an LED flashes once when an IR sequence is received . Now when I send a sequence it gets at the same time picked up by the receiver and the LED starts flashing. It seems the sent sequence repeats several times which leads to multiple ...
by with ice cream
Tue Mar 03, 2015 9:35 pm
Forum: Troubleshooting
Topic: RPI2 and GPIO issues [solved/explained]
Replies: 4
Views: 897

Re: RPI2 and GPIO issues

I checked all connections, everything is as it should be. I checked with piscope what happenes when I send an IR sequence (through BCM pin 24). As is to be expected the same sequence appears on the pin where the IR receiver is connected (pin 18). The pin (13) where the flickering LED is connected do...

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