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1. minute (mntmn@mastodon.social)'s status on Saturday, 01-Mar-2025 22:08:48 JST minute

   i had some strange wifi issues on my rk3588 pocket with asiarf wifi card and single laird/ezurio antenna. the antenna was in the original location on the headphone/switch port board. wifi would reproducibly stop whenever i played a youtube video fullscreen, but resume when i went out of fullscreen. i then did some experiments with always-on-top terminal windows obscuring part of the video, and that helped. 1/2

   • minute (mntmn@mastodon.social)'s status on Saturday, 01-Mar-2025 22:10:28 JST minute

     in reply to

     my theory is that fullscreen video creates enough EMI on the display flex cable that it interferes with the antenna directly next to it. i moved the antenna now to the other side of the device (on the back of the lid, in the corner near ethernet, with ample distance to the lid edges and the edge of the copper coating), and the issue is gone...

   • minute (mntmn@mastodon.social)'s status on Saturday, 01-Mar-2025 22:12:28 JST minute

     in reply to

     (for completeness, this is with display v1)

   • Timon 🛠 (timonsku@mastodon.social)'s status on Saturday, 01-Mar-2025 22:13:02 JST Timon 🛠

     in reply to

     @mntmn oh def.! Thats a pretty common issue actually. Even Pi4 has that problem at certain resolution and refreshrate combinations. The problem might also go away if you change either variable in this case.

   • minute (mntmn@mastodon.social)'s status on Saturday, 01-Mar-2025 22:15:10 JST minute

     in reply to

     • Timon 🛠

     @timonsku ah yes, i recall there was hdmi->wifi interference right

   • minute (mntmn@mastodon.social)'s status on Saturday, 01-Mar-2025 22:20:36 JST minute

     in reply to

     now i just need chromium to fix this issue so i can use it in wayland mode on rk3588... https://issues.chromium.org/issues/343592370

   • Timon 🛠 (timonsku@mastodon.social)'s status on Saturday, 01-Mar-2025 22:33:27 JST Timon 🛠

     in reply to

     @mntmn yea! If the clock is just right it creates huge harmonics at 2.4Ghz

   • Alaric Snell-Pym (kitten_tech@fosstodon.org)'s status on Saturday, 01-Mar-2025 22:39:16 JST Alaric Snell-Pym

     in reply to

     @mntmn I once had an ARM LPC2106 dev board with crosstalk from the RS233 lines onto the processor reset line, that under high speed RS232 traffic would inject short negative pulses into /RESET, locking the CPU up as they were far shorter than the datasheet mininum reset pulse.

     You can imagine the fun I had working out this was the problem, not a bug in the UART driver I was writing 🤬

   • minute (mntmn@mastodon.social)'s status on Saturday, 01-Mar-2025 22:39:16 JST minute

     in reply to

     • Alaric Snell-Pym

     @kitten_tech ooof

   • abortretryfail (abortretryfail@mastodon.social)'s status on Sunday, 02-Mar-2025 05:57:31 JST abortretryfail

     in reply to

     @mntmn

     Sounds like the issue I was helping troubleshoot last November.

     https://community.mnt.re/t/wifi-reception-problem-probably-overheating-wireless-chipset/2273/105