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by with ice cream
Mon Oct 21, 2019 9:19 pm
Forum: Camera board
Topic: Check camera board on RPI4
Replies: 5
Views: 144

Re: Check camera board on RPI4

HermannSW wrote:
Mon Oct 21, 2019 8:14 pm
What is the output of "vcgencmd get_camera"?
supported=0 detected=0
by with ice cream
Mon Oct 21, 2019 7:01 pm
Forum: Camera board
Topic: Check camera board on RPI4
Replies: 5
Views: 144

Re: Check camera board on RPI4

Thanks for the response but I went through all the usual troubleshooting steps already. I have reached the stage where I wonder if it is a firmware problem.
by with ice cream
Mon Oct 21, 2019 6:43 pm
Forum: Camera board
Topic: Check camera board on RPI4
Replies: 5
Views: 144

Check camera board on RPI4

I've tried three camera modules, three different ribbon cables (all formerly working) on my Raspberry Pi 4, but the cameras do not get detected. start_x=1 is in my /boot/config.txt and the ribbon cable is inserted the proper way around. What can I do to further troubleshoot this?
by with ice cream
Mon Aug 19, 2019 1:10 pm
Forum: Advanced users
Topic: RPI 4: issues with USB3-mounted root partition [SOLVED]
Replies: 2
Views: 1217

Re: RPI 4: issues with USB3-mounted root partition

Thanks, @epoch1970, the approach described in that post helped. I now have an ultra-fast booting Pi4.
by with ice cream
Mon Aug 19, 2019 10:56 am
Forum: Advanced users
Topic: RPI 4: issues with USB3-mounted root partition [SOLVED]
Replies: 2
Views: 1217

RPI 4: issues with USB3-mounted root partition [SOLVED]

I cloned the root partition from the sd card to an SSD. The SSD resides in an enclosure with an USB 3 interface. Copying and regular files operations work fine. Now, when I boot by pointing to the SSD partition for / the boot process is very slow and several seemingly unrelated services fail (e.g. h...
by with ice cream
Mon Jul 22, 2019 9:41 am
Forum: Advanced users
Topic: Composite screen cannot be woken up
Replies: 6
Views: 311

Re: Composite screen cannot be woken up

jamesh wrote:
Mon Jul 22, 2019 8:15 am
Use fbset to create a new one.
Thanks for the response. I am using fbset. That's what worked in the past. It doesn't anymore. I reported the issue on github.
by with ice cream
Sun Jul 21, 2019 7:08 pm
Forum: Advanced users
Topic: Composite screen cannot be woken up
Replies: 6
Views: 311

Re: Composite screen cannot be woken up

I suggest you try loading a fresh copy of that on a different SD card as the bug may have been fixed. Thanks for your comment. Even though I didn't believe that a distribution change would be an adequate measure to approach the issue I did it. I switched from a Pi 2b to a Pi 3b and set everything u...
by with ice cream
Sat Jul 20, 2019 9:30 pm
Forum: Advanced users
Topic: Composite screen cannot be woken up
Replies: 6
Views: 311

Re: Composite screen cannot be woken up

It also looks like a revival of this bug:

Code: Select all

pi@raspberrypi ~> fbset -depth 8 && fbset -depth 16
ioctl FBIOPUT_VSCREENINFO: Invalid argument
by with ice cream
Sat Jul 20, 2019 8:45 pm
Forum: Advanced users
Topic: Composite screen cannot be woken up
Replies: 6
Views: 311

Composite screen cannot be woken up

I just upgraded from jessie to stretch. On boot the screen comes up normally but I cannot wake it up after putting it to sleep with "tvservice -o". The screen wakes up but only black is shown. It used to work under jessie. The syslog shows this: Jul 20 22:21:53 badboy vncserver-x11[492,root]: Consol...
by with ice cream
Sat Jun 29, 2019 7:24 pm
Forum: Troubleshooting
Topic: Pi 4 Installation Issues (Solved)
Replies: 22
Views: 3325

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: 22
Views: 3325

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: 473

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: 473

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: 707

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: 707

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: 707

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: 707

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: 707

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: 707

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: 707

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: 545
Views: 271742

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: 14232

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: 545
Views: 271742

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: 21293

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: 2027

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).

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