i should not have said anything
[11561053.235151] xhci_hcd :01:00.0: @1ed0c6e0
0e00 02048000
[11572206.218075] Under-voltage detected! (0x00050005)
[11572207.738154] bcmgenet fd58.genet eth0: Link is Down
[11572211.898285] bcmgenet fd58.genet eth0: Link
> Is this lightning bolt a hardware feature? Like, it overlays it on the
> display, even on Plan 9?
Well yes, but actually no:
https://ownyourbits.com/2019/02/02/whats-wrong-with-the-raspberry-pi/
There's an OS involved.
Also I ordered a 1GB compute module without thinking of this thread.
I've been using an RPI4B with 4GB as my main term for several months. It
pxe boots (no SD card) and I leave the session on, but run screenlock to
guard against cat walk (pun?). It has rebooted once, but I'm pretty sure it
was due to power fluctuations (didn't see it happen). I built the kernel on
not the same but i am just building up a pi3b+ server running Richard’s current
kernel. i have a lightning bolt onscreen and occasional red led flashes but so
far it has bern absolutely reliable.
the only areas of minor problems: wifi does not always connect, and if it fails
it needs a power
On Wed, Nov 18, 2020 at 6:18 PM Anthony Sorace wrote:
> > Richard asked:
...
> Is this lightning bolt a hardware feature? Like, it overlays it on the
> display,
> even on Plan 9? I've never seen it. I'll watch for the power LED indicator.
Correct. Though I have not seen them on my pi 3b+
> Richard asked:
> The pi4 is very sensitive to power supply voltage. Are you using
> an "official" pi4 power supply (5.2v)?
Yes; same power supply on the 4GB and 1GB models. That is, same exact
unit, on the same outlet. I had all sorts of problems with my first several Pi
and know better than to
well they have FCC compliance, so i'd hope it's just internal
interference due to lack of rf separation on the board. unless the fcc
test is so busted that they were able to activate a less-problematic
pixel clock and never tried the full possible range? :D
since i don't have a github account i
There were reports of 2560x1440 res generating RF noise in the 2.4GHz band wifi
channel 1. The proposed solution (by Eben Upton) was to use channel 4 or higher
or use 5GHz wifi band at this res. And supposedly there is a firmware fix for
this. No idea about the bluetooth issue. You should
well it's a hardware issue
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> Wifi works fine on pi3 and pi4
To clarify, I meant "works fine on Plan 9 on pi3 and pi4".
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well, for me hdmi reliably stops working when i turn on the bluetooth
keyboard and versa.
clearly RF interference was none of their concern when they made this chip.
if your monitor suggests a different pixel clock you might get lucky
and it's just good enough, but your signal quality is gonna
> i recommend saving
> your time and not bothering to ever try and get the wifi or bluetooth
> to work on plan9
Wifi works fine on pi3 and pi4, in my experience.
Bluetooth works well when it works, but my driver missing some error
recovery code so it's only reliable in favourable conditions
from the hardware point of view...
i never had a single problem with pi4 power rails or it's RAM.
if we're lucky this might be just your pi. while rare, memory does
fail sometimes...
What doesn't work here is the usb-c power supply, so i have used a
crappier mobile phone charger with a passive
> i had loads of problems with a lowly pi3+ until i tried an old ipad charger
My desktop pi3b+ is currently running on a tablet charger (which was fine
for the pi2b). It shows the lightning bolt icon on the screen constantly,
but runs stably.
The pi4 flashes the red power LED to indicate
> i had loads of problems with a lowly pi3+ until i tried an old ipad charger
My desktop pi3b+ is currently running on a tablet charger (which was fine
for the pi2b). It shows the lightning bolt icon on the screen constantly,
but runs stably.
The pi4 flashes the red power LED to indicate
> The pi4 is very sensitive to power supply voltage.
absolutely,
i had loads of problems with a lowly pi3+ until i tried an old ipad charger
(2.5A i think), it has been stable since.
-Steve
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> reboots after a while, seemingly spontaneously
The pi4 is very sensitive to power supply voltage. Are you using
an "official" pi4 power supply (5.2v)? I had to go through several
power supplies for my pi4 cluster until I found one which would keep
them stable (40W Anker PowerPort 5).
Sigh. Dependent *on* ram.
I should also point out that I'm not
doing anything noteworthy in config.txt;
I believe the only changes were HDMI
settings.
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