Re: [9fans] Raspberry Pi 4 stability dependent in RAM

[hiro <23hiro@gmail.com>]

i should not have said anything

[11561053.235151] xhci_hcd 0000:01:00.0: @000000001ed0c6e0 00000000
00000000 0e000000 02048000
[11572206.218075] Under-voltage detected! (0x00050005)
[11572207.738154] bcmgenet fd580000.genet eth0: Link is Down
[11572211.898285] bcmgenet fd580000.genet eth0: Link is Up -
1Gbps/Full - flow control off
[11572212.458226] Voltage normalised (0x00000000)
[11585621.202242] xhci_hcd 0000:01:00.0: ERROR Transfer event for
disabled endpoint slot 2 ep 3

gonna move back to my seagate dockstar (kirkwood) for this thing :(
at least then the rpi is free for a stateless 9front terminal again
(easier to reboot when there's problems like the above :()

On 11/14/20, hiro <23hiro@gmail.com> wrote:
> 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 don't think they will listen to
> me about my issues with the device.
>
> but anyway they should hire an RF engineer and not me. if they tried
> the common combinations at all they should have noticed themselves, no
> ?
>
> i have been using 4k@60hz when i experienced my problem, bluetooth
> cannot be switched to 5ghz.
>
> i'm just happy it works at all, i was just gonna return it otherwise
> like i did with the earlier rpi version. don't have time to make
> bug-wishlists for future raspberry christmas trees (took them 8 years
> already to make the first rpi with working ethernet+usb).
>
> On 11/14/20, Bakul Shah <bakul@iitbombay.org> wrote:
>> 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
>> report
>> these issues either on their forum or one of their github repos.
>>
>>> On Nov 14, 2020, at 7:14 AM, hiro <23hiro@gmail.com> wrote:
>>>
>>> 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 suffer no
>>> matter what

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