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Date:   Sat, 7 May 2022 11:39:10 -0400
From:   Alan Stern <stern@rowland.harvard.edu>
To:     James Dutton <james.dutton@gmail.com>
Cc:     USB mailing list <linux-usb@vger.kernel.org>
Subject: Re: usb disk drive disconnect making readonly
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On Fri, May 06, 2022 at 09:48:58PM +0100, James Dutton wrote:
> On Fri, 6 May 2022 at 15:35, Alan Stern <stern@rowland.harvard.edu> wrote:
> > >
> > > Hi Alan,
> > >
> > > Here are some log messages. I suspect the storage device is going into
> > > some sort of sleep mode, and the kernel does not seem to be able to
> > > wake it up again.
> > > The device is a USB to NVME adapter. Using the chip: Realtek RTL9210
> > > The log is perfectly normal up until the 2nd line below onwards:
> > ...
> >
> > That log isn't sufficient.
> >
> > It would be a big help if instead of sending your kernel log file, you send
> > the output of the "dmesg" program.  And don't send just the part
> > starting where the problem begins; we need to see what happened before
> > that as well.
> >
> > In addition, it would help if you enable USB debugging before the
> > problem occurs:
> >
> >         echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control
> >
> 
> Hi,
> 
> I will try to get some more logs the next time it happens.
> dmesg is not available. As the disk has essentially failed at that
> point, nothing works (no keyboard input), so the only way I have got
> any useful output has been with rsyslog over the network, and then
> show the syslog output on that remote machine.

You can try booting with a network console and increasing the log level 
(so that debug messages are sent to the console).

Alan Stern