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by with ice cream
Thu Jan 30, 2020 2:33 am
Forum: Advanced users
Topic: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)
Replies: 16
Views: 980

Re: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)

is it possible to tell the wlan interface to change the channel while it is connected to 5G band? Thanks for the suggestion but I don't think changing the channel would solve the original issue. I also think one has to select the channel the access Point is broadcasting on. The issue is twofold. It...
by with ice cream
Wed Jan 29, 2020 3:37 pm
Forum: Advanced users
Topic: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)
Replies: 16
Views: 980

Re: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)

Whitelisting the desired MAC, blacklisting the unwanted MAC of the AP and limiting the frequencies didn't help. Every once in a while the Raspberry ends up in the 5 GHz network. : (
by with ice cream
Thu Jan 09, 2020 9:49 pm
Forum: Advanced users
Topic: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)
Replies: 16
Views: 980

Re: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)

if freq_list =... is not working, maybe scan_freq =... to only scan the given frequencies. or non_pref_chan =... to define non prefered channels in multi band operation It wasn't working- I have the suspicion that the access point's steering is overriding the client's settings (which shouldn't happ...
by with ice cream
Tue Jan 07, 2020 1:22 pm
Forum: Advanced users
Topic: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)
Replies: 16
Views: 980

Re: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)

Paul Hutch wrote:
Tue Jan 07, 2020 1:02 pm
You can use the freq_list parameter in wpa_supplicant.conf to limit what frequency/channels the Pi will connect to.
Thanks, but I trying that already (see above). It is not working. When I check, it initially connects to 34:81:C4:XX:XX:XX but soon switches to 34:81:C4:XX:XX:XY.
by with ice cream
Tue Jan 07, 2020 11:41 am
Forum: Advanced users
Topic: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)
Replies: 16
Views: 980

Re: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)

is your 5Ghz/2.4GHz AP a DIY one? [...] you also can give both bands a different SSID name e.g. abc for the 2.4GHz band and abc-5g for the 5GHz band. so you can choose the bands by name, when you connect a device. Thanks for the remark. The access point is a widely used commercial cable router. Als...
by with ice cream
Mon Jan 06, 2020 8:26 pm
Forum: Advanced users
Topic: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)
Replies: 16
Views: 980

Re: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)

mattmiller wrote:
Mon Jan 06, 2020 8:09 pm
One solution might be to buy a separate 2.4GHz dongle and just completely disable the internal
One solution when you can't unlock your house's back door is to add another one with a working lock. : )

Edit: No snarkyness intended.
by with ice cream
Mon Jan 06, 2020 6:59 pm
Forum: Troubleshooting
Topic: RPi4 not rebooting headless after using HDMI to set it up
Replies: 4
Views: 162

Re: RPi4 not rebooting headless after using HDMI to set it up

Try setting display and resolution settings in /boot/config.txt like this:

Code: Select all

hdmi_force_hotplug=1
hdmi_group=2 
hdmi_mode=16 
by with ice cream
Mon Jan 06, 2020 4:50 pm
Forum: Advanced users
Topic: Serial-Signal send information to local website
Replies: 14
Views: 512

Re: Serial-Signal send information to local website

I would use Node RED, the Serial-In node and Node RED's dashboard. You can create flows for visualization and processing/storage.
by with ice cream
Mon Jan 06, 2020 11:56 am
Forum: Advanced users
Topic: Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)
Replies: 16
Views: 980

Odd routing, cannot force 4b Pi to 2.4 GHz wifi (wpa_supplicant)

I don't know why but it seems two Raspberry Pis on my network (a 4b and a 3b) don't see each other when they are connected to different frequency bands on the same access point. In other words, it seems as if the access point wouldn't route between devices on different bands. On the other hand, I ca...
by with ice cream
Sun Oct 27, 2019 8:18 am
Forum: Camera board
Topic: Check camera board on RPI4
Replies: 6
Views: 1309

Re: Check camera board on RPI4 [SOLVED]

Thank you for your help. I solved my issue. The reason why the camera wasn't found was that the /boot/config.txt entry to activate the camera was made in the wrong file. The partition the Pi booted from wasn't mounted as /boot but rather a clone of the boot partition on my USB3-connected SSD. I fixe...
by with ice cream
Mon Oct 21, 2019 9:19 pm
Forum: Camera board
Topic: Check camera board on RPI4
Replies: 6
Views: 1309

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: 6
Views: 1309

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: 6
Views: 1309

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: 1292

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: 1292

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: 538

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: 538

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: 538

Re: Composite screen cannot be woken up

It also looks like a revival of this bug:

Code: Select all

[email protected] ~> 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: 538

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: 7285

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: 7285

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: 624

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: 624

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: 939

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...

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