1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
# sysfs.conf manual page (sysfs.conf.5)
#
# Copyright © 2022 Guillem Jover <guillem@debian.org>
#
# This is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
=encoding utf8
=head1 NAME
sysfs.conf, sysfs.d/*.conf - Linux sysfs attributes setting configuration files
=head1 DESCRIPTION
These configuration files are used to set B<sysfs> attribute values and
modify their file mode or owner, during the system boot.
Note that these configuration files are concerned with the F</sys> filesystem
and should not be confused with the F</etc/sysctl.conf> configuration which
is concerned with the F</proc/sys> filesystem instead.
=head1 FORMAT
The syntax consists on a series of line based directives for F<sysfs>
attributes, those being pathnames within that filesystem, with the
following format:
=over 4
=item I<attribute> = I<value>
Set I<value> for the F<sysfs> I<attribute>.
=item B<mode> I<attribute> = I<mode>
Set the I<mode> for the F<sysfs> I<attribute>.
Where I<mode> is any mode accepted by L<chmod(1)>.
=item B<owner> I<attribute> = I<owner>[:I<group>]
Set the I<owner> (and/or I<group>) for the F<sysfs> I<attribute>.
Where I<owner> (and/or I<group>) are any specification accepted by
L<chown(1)>.
=back
Leading and trailing whitespace (SPACE, TAB), and whitespace around
the B<=> character are ignored.
Comments start with a B<#> character until the end of line.
Empty or whitespace-only lines are also ignored.
The I<attribute> paths support L<glob(7)> wildcard patterns.
Any I<attribute> that does not exist will be warned about, but will not cause
the loading to fail.
=head1 FILES
=over
=item F</etc/sysfs.conf>
The main configuration file.
It gets loaded first if readable.
=item F</etc/sysfs.d/*.conf>
The optional configuration fragment files.
These get loaded after the main configuration file, if readable,
in glob order.
=back
=head1 EXAMPLES
Always use the powersave CPU frequency governor.
devices/system/cpu/cpu0/cpufreq/scaling_governor = powersave
Use userspace CPU frequency governor and set initial speed.
devices/system/cpu/cpu0/cpufreq/scaling_governor = userspace
devices/system/cpu/cpu0/cpufreq/scaling_setspeed = 600000
Set permissions of suspend control file.
mode power/state = 0660
owner power/state = root:power
=head1 SEE ALSO
L<sysfs(5)>,
L<https://www.kernel.org/doc/Documentation/filesystems/sysfs.txt>,
L<https://www.kernel.org/doc/Documentation/ABI/stable/>.
|
