Raspberry Pi Forums

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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.

with ice cream

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 ...

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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.

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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...

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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...

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OK, the documentation explains that "poll_once=on" applies after boot. I'll try this and see if there are no more panics.

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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...

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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?

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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?

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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.

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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...

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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...

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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...

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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.)

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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...

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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).

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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...

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Not helpful, but I am in the same situation. I rewired everything twice, tried the python code that is floating around - no dice.

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gkreidl wrote:Then reinstall kodi from the repository.

Thanks!

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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...

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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...

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For those still following: I found the cause of the LED flickering. It is an (unwanted) feedback loop. I started a new topic here.

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[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...

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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 ...

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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...

Search found 155 matches

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Re: Pi 4 Installation Issues (Solved)

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Control original blanker?

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