Re: kern/53493: mouse keeps re-attaching using amd64 8.0 boot.iso CD

[mlelstv%serpens.de@localhost (Michael van Elst)]

The following reply was made to PR kern/53493; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/53493: mouse keeps re-attaching using amd64 8.0 boot.iso CD
Date: Thu, 2 Aug 2018 11:21:34 -0000 (UTC)

 martin%duskware.de@localhost (Martin Husemann) writes:
 
 > On Thu, Aug 02, 2018 at 04:40:01AM +0000, Michael van Elst wrote:
 > >  That's no bug. The mouse indeed does indeed disconnect and reconnect
 > >  until it is actually accessed, that's a feature of most mice today.
 > 
 > What is the downside of the kernel driver always opening the mouse (and
 > what does this actually mean in USB terms)?
 
 This would be some magic handling of some USB devices. In USB terms it is
 probably an open pipe that prevents the detach/attach-orgy.
 
 I first thought this were some kind of power-saving mode, but I found some
 comments that it is meant to help detecting the mouse after a suspend or
 hibernation.
 
 N.B. for sysinst it might be helpful to run a console redirection (TIOCCONS)
 to avoid disruption of the display.
 
 -- 
 -- 
                                 Michael van Elst
 Internet: mlelstv%serpens.de@localhost
                                 "A potential Snark may lurk in every tree."