Raspberry Pi Forums

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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...

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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. : (

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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...

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Thanks, I'll give it a shot.

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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.

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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...

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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.

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

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hdmi_force_hotplug=1
hdmi_group=2 
hdmi_mode=16

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I would use Node RED, the Serial-In node and Node RED's dashboard. You can create flows for visualization and processing/storage.

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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...

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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...

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HermannSW wrote: ↑
Mon Oct 21, 2019 8:14 pm
What is the output of "vcgencmd get_camera"?

supported=0 detected=0

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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.

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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?

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Thanks, @epoch1970, the approach described in that post helped. I now have an ultra-fast booting Pi4.

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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...

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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.

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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...

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It also looks like a revival of this bug:

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[email protected] ~> fbset -depth 8 && fbset -depth 16
ioctl FBIOPUT_VSCREENINFO: Invalid argument

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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...

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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.

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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...

Search found 175 matches

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

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

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

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

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

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