10 ms·
Answer from forum Had the same problem with Raspi 4B. Problem was dependent on screen resolution (!!). With 1920x1080, wlan0 became disconnected af
by adontz 7y ago
Answer from forum
Had the same problem with Raspi 4B.
Problem was dependent on screen resolution (!!).
With 1920x1080, wlan0 became disconnected after it was
ok at lower screen resolutions. Was in 2.4GHz band.
After turning on 5GHz in the router and going into
the network preferences (right click the network icon top
right on screen) and SSID ... and checking "automatically
configure options" the connection remains stable (so far :D ).
So radio interference it is?
- codetrotter 7y agoReminds me of the MacBook Air that I have (2018 model). When I connect my USB 3 hub to it, I lose my WiFi :( I Googled it when it happened a while back, and apparently other people have this problem with the MacBook Air too. Some choose to shield the USB 3 cable with tinfoil. Personally I opted to connect a USB 3 Ethernet interface to the hub and use wired Ethernet when I use the hub.
- WilliamEdward 7y agoI have this problem with the macbook pro
- pacoverdi 7y agoSimilar problem with my 2014 MBP: I lose wifi if I plug it into my UHD monitor with a DisplayPort cable, but not if I use HDMI. Probably has to do with cable quality (bought it on Amazon).
- sniuff 7y agoit happens with macbook pro 2018 as well. but only with adapters from amazon, using official adapter from apple store seems not to have that problem. wrapping 3rd party adapter in tin foil actually show much better speedtest results when connected, then without the foil.
- StreakyCobra 7y agoHere you are: https://www.intel.com/content/www/us/en/products/docs/io/universal-serial-bus/usb3-frequency-interference-paper.html https://www.intel.com/content/www/us/en/products/docs/io/uni...
- albertgoeswoof 7y agoI have a thunderbolt to 4 port usb 3 hub that when connected to a 2019 MacBook Pro interferes with the mouse pointer (it sticks and the pointer goes large every few seconds). Could this be related?
- cameronh90 7y agoThat could be an electrical grounding problem. In my experience touchpads are very sensitive to the quality of the power supply.
- protomyth 7y agoYeah, we have crap power where I work and have cut down a lot of weird, random issues by buying a decent UPS for each worker machine. Even the people with laptops.
- oefrha 7y agoBrings back fond memories of an extremely laggy Logitech wireless mouse whenever an external display is plugged into the MiniDP port on the same side.
- TranceMan 7y agoFond memories of wondering why WiFi occassionally stopped working - eventually correlated it with the use of the microwave.
- bluedino 7y agoCheap hubs or cables have been causing this since 2016
- fragmede 7y ago2016? It's been happening since before electronics existed to allow the personal computer to be invented!
- linker3000 7y agoIn the very distant past (late 1980s, early 90s), Olivetti changed their PC keyboard design; it went from having the keyboard PCB assembly inside a metal clamshell to a bare board with a metallised plastic sheet on the back of the PCB (they 'cheaped out'). We got to know about the design change when a rather large and sprawling local leisure centre reported that often when someone used their walkie talkie near a PC, the screen filled with random characters and sometimes the dot matrix printers would 'go haywire' (CTRL-P = Print what's displayed on the screen). In effect, the rf signal from the walkie talkies was 'mashing the keys'. The immediate fix was to swap in some older keyboards, the longer fix was down to Olivetti using better shielding and some appropriately-placed capacitor decoupling on the power and signal lines.
- shifto 7y ago> "In the very distant past (late 1980s, early 90s), Olivetti..." Havnm't heard that brand in a while! I now remember I still have an 486 DX4 100MHz Olivetti laptop. Which is kind of pink-red-brownish.
- heelix 7y agoFirst time I saw a room full of non-crt computer monitors, found out Merrill Lynch moved to a new building to save money. What they discovered is the CRTs would weird out every time the subway train went by. All the cash saved by moving was lost buying the stupid expensive monitors.
- fragmede 7y agoI wouldn't have considered trains to be a source of EM interference but in retrospect it makes sense. one that's amazed me is that military jets and warships cause some of the nearby consumer electronics go wonky, but as they literally run systems that are trying to jam radio waves, it makes a ton of sense that eg garage doors have trouble keeping up.
- tedunangst 7y agoIs it possible the walkie talkie was out of spec as well? Little signal booster added after market?
- wil421 7y agoWhat kind of cables are you using? Either your cable or hub isn’t up so spec and properly shielded.
- dmd 7y agoI had this problem until I threw out my $10 USB 3 hub and got a $20 one instead.
- bufferoverflow 7y agoWhy not simply buy a shielded USB cable?
- innagadadavida 7y ago5GHz wifi is a lot more stable. Mine used to disconnect with microwave running. Also your hub might have leaky cables. I had an issue like this with bad hdmi cables too.
- sowbug 7y agoMicrowave ovens and wifi use the same frequency range for the same reason: 2.4 GHz is available as unlicensed spectrum. In theory someone could build a 5 GHz microwave oven, but it wouldn't be cost-effective for a consumer appliance. I once heard something about that frequency working better with water molecules, but after looking it up I think it's a myth.
- pvg 7y agoA 5 GHz microwave would be more efficient but you don't necessarily want more efficient for cooking - that would just heat the outside of the food fastest. Commercial microwaves apparently run somewhere in the 900 MHz band. There are some neat graphs here: http://www1.lsbu.ac.uk/water/microwave_water.html http://www1.lsbu.ac.uk/water/microwave_water.html
- selectodude 7y agoI have that issue with my 2016 MacBoo Pro, but I'm pretty sure it's due to my crap quality USB3+NIC that I bought.
- _pmf_ 7y agoLikely, but I've also had strange effects like this that have ultimately been traced back power domain issues on some of our devices.
- Accujack 7y agoYes, although Eben Upton suggests trying a better grade of HDMI cable... the frequency of the higher resolution on screen will radiate noise out of a poorly shielded cable enough to interfere with Wi-Fi in the 2.4Ghz range. Don't use a cheap cable, use one rated for 4k, and see if that helps.
- nkrisc 7y agoReformatted for mobile users: Had the same problem with Raspi 4B. Problem was dependent on screen resolution (!!). With 1920x1080, wlan0 became disconnected after it was ok at lower screen resolutions. Was in 2.4GHz band. After turning on 5GHz in the router and going into the network preferences (right click the network icon top right on screen) and SSID ... and checking "automatically configure options" the connection remains stable (so far :D ).
- IgorPartola 7y agoThis is a good reminder that every digital circuit is really a fancy analog circuit. Your program may be perfectly correct, but when it runs on faulty hardware, you are hosed no matter how many times you’ve formally proven it.
- ivanhoe 7y agoor even a perfectly functional hardware in presence of EM noise.