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Date: Wed, 21 Mar 2012 22:38:15 +0700
Message-ID: <CAA2qdGV_V5-U_m20BrYVk-82iS9o9k3MSmf_JyWq9GofeAzs-w@mail.gmail.com>
Subject: Re: [gentoo-user] mdev: sound is only working some of the time.
From: Pandu Poluan <pandu@poluan.info>
To: gentoo-user@lists.gentoo.org
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On Mar 21, 2012 10:04 PM, "Alan Mackenzie" <acm@muc.de> wrote:
>
> Hello again,
>
> On Wed, Mar 21, 2012 at 08:12:40PM +0700, Pandu Poluan wrote:
> > On Mar 21, 2012 8:07 PM, "Alan Mackenzie" <acm@muc.de> wrote:
>
> > > On Wed, Mar 21, 2012 at 07:49:02PM +0700, Pandu Poluan wrote:
> > > > Strange...
>
> > > > Do you use mdev to handle hotplugs, btw?
>
> > > You mean, like sticking in a USB stick, or turning my printer on?
Yes, I
> > > do.
>
>
> > No, I mean, did you do :
>
> > echo /bin/mdev > /proc/sys/kernel/hotplug
>
> No I haven't. I don't understand at all what this is about. Any chance
> of a quick summary?
>
According to the busybox documentation, /proc/sys/kernel/hotplug contains
the path to a program that will be invoked on hotplug events (hotplug here
means the creation of a new device node under /dev, not necessarily
actually plugging something onto the box).
Doing the above 'echo' will result in kernel invoking mdev when a hotplug
event fires; mdev will then act upon the newly-created device node
according to the 'recipe' in /etc/mdev.conf, e.g., chown-ing the node,
renaming/moving the node, making a symlink, or even triggering a script.
The above line should go right after the 'mdev -s' line in linuxrc.
> > (ensure beforehand that /bin/mdev is a symlink to /bin/busybox)
>
> my /sbin/mdev is an indirect symlink to /bin/busybox as follows:
> ^
>
> /sbin/mdev -> /bin/bb -> busybox
>
> Presumably this would be OK.
>
I think so...
Rgds,
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<p><br>
On Mar 21, 2012 10:04 PM, "Alan Mackenzie" <<a href=3D"mailto:=
acm@muc.de">acm@muc.de</a>> wrote:<br>
><br>
> Hello again,<br>
><br>
> On Wed, Mar 21, 2012 at 08:12:40PM +0700, Pandu Poluan wrote:<br>
> > On Mar 21, 2012 8:07 PM, "Alan Mackenzie" <<a href=
=3D"mailto:acm@muc.de">acm@muc.de</a>> wrote:<br>
><br>
> > > On Wed, Mar 21, 2012 at 07:49:02PM +0700, Pandu Poluan wrote=
:<br>
> > > > Strange...<br>
><br>
> > > > Do you use mdev to handle hotplugs, btw?<br>
><br>
> > > You mean, like sticking in a USB stick, or turning my printe=
r on? =C2=A0Yes, I<br>
> > > do.<br>
><br>
><br>
> > No, I mean, did you do :<br>
><br>
> > echo /bin/mdev > /proc/sys/kernel/hotplug<br>
><br>
> No I haven't. =C2=A0I don't understand at all what this is abo=
ut. =C2=A0Any chance<br>
> of a quick summary?<br>
></p>
<p>According to the busybox documentation, /proc/sys/kernel/hotplug contain=
s the path to a program that will be invoked on hotplug events (hotplug her=
e means the creation of a new device node under /dev, not necessarily actua=
lly plugging something onto the box).</p>
<p>Doing the above 'echo' will result in kernel invoking mdev when =
a hotplug event fires; mdev will then act upon the newly-created device nod=
e according to the 'recipe' in /etc/mdev.conf, e.g., chown-ing the =
node, renaming/moving the node, making a symlink, or even triggering a scri=
pt.</p>
<p>The above line should go right after the 'mdev -s' line in linux=
rc.</p>
<p>> > (ensure beforehand that /bin/mdev is a symlink to /bin/busybox=
)<br>
><br>
> my /sbin/mdev is an indirect symlink to /bin/busybox as follows:<br>
> =C2=A0 =C2=A0^<br>
><br>
> =C2=A0 =C2=A0/sbin/mdev -> /bin/bb -> busybox<br>
><br>
> Presumably this would be OK.<br>
></p>
<p>I think so...</p>
<p>Rgds,<br>
</p>
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