Thanks. Just out of curiosity, how can I use "dmesg" w/o keyboard?

Appreciate, Thomas

On Mon, Aug 3, 2020 at 7:37 PM Stefan Wahren <> wrote:

Am 03.08.20 um 12:04 schrieb Peter Robinson:
> On Mon, Aug 3, 2020 at 10:57 AM <> wrote:
>> I used today's rawhide image from and get to the Welcome screen but then neither USB keyboard nor mouse work and I am stuck on my RPi4/8GB.
> I don't think the support for loading the USB firmware on the 8Gb
> model has made it upstream yet. In the 1/2/4gb models it was loaded by
> the Raspberry Pi firmware from SPI flash, in the 8Gb model they
> dropped the SPI flash and there has to be kernel patches to load it.
> That problem is unrelated to the CMA/DMA issue.

the USB quirk is available in Linux 5.8 [1], but there is a related
report [2].

It seems to be related to the board revision and possibly arm64.

A dmesg output might be helpful.


[1] -

[2] -