Hi Dmitry,

On Wed, Feb 17, 2021 at 12:26:18PM -0800, Dmitry Torokhov wrote:

On Wed, Feb 17, 2021 at 11:07:18AM -0800, Ronald Tschalär wrote:

quoted

The problem is that tracing can't be set via sysfs until the module is
loaded, at which point the keyboard and trackpad initialization commands
have already been run and hence tracing can't be used to debug problems
here.

Adding this param allows tracing to be enabled for messages sent and
received during module probing. It takes comma-separated list of events,
e.g.

  trace_event=applespi_tp_ini_cmd,applespi_bad_crc

You can unbind and rebind a device to a driver via sysfs as many times
as needed (see bind and unbind driver sysfs attributes), so I believe

Hmm, I'm going to have to play with that a bit, but one place it still
won't help I think is something we ran into in practise: init was
failing during boot, but was successfull later on.


  Cheers,

  Ronald