Actually, this is more tricky than I thought. The validity of the bug
1299975 patch depends on which wireless driver is in use, apparently
reflecting some crufty aspects of sysfs and its driver implementations.
In bug 1299975, on rereading, the reporter (savage) says that with an
Intel wireless device the virtual file presented in
/sys/class/net/$device/device was named "enabled" whereas the script
/usr/lib/pm-utils/power.d/wireless referenced "enable".
Whereas I observe that, if present, the virtual file presented in
/sys/class/net/$device/device is named "enable", just as in the
directory listing in comment #3.
In a Toshiba Tecra 8200 with wlan1 identified as Qualcomm Atheros
ARS212/5213/2414 (driver "ath5k"), it's present as "enable".
In a Dell Inspiron 1721 with wlan0 identified as Broadcom Corporation
BCM4321 (driver "b43-pci-bridge"), it's not present at all in
/sys/class/net/$device/device, but there is a corresponding
/sys/bus/pci/drivers/b43-pci-bridge/0000:0b:00.0/enable (and writing 0
to this file disables the driver). However the test in the wireless
script assumes that the device is disabled if the
/sys/class/net/$device/device/enable* file doesn't exist, so the script
fails in this case.
Presumably
a) the presence of the /sys/class/net/$device/device/enable* file
depends on whether the ability to disable the device via
/sys/class/net/$device/device is supported by the device+driver
combination,
b) if the file is present its exact name depends on some details of the
driver's sysfs interface and installation procedure, but it is either
"enable" or "enabled" (and both are never present together), and
c) if the file is not present the wireless script should assume the
device is enabled.
If these assumptions are valid, the following might be a better bet for
lines 22-23 of /usr/lib/pm-utils/power.d/wireless:
# Assume device is disabled if enable or enabled file exists containing 0;
then skip
[ -f /sys/class/net/$1/device/enable* ] && [ "$(cat
/sys/class/net/$1/device/enable*)" = "0" ] && return 1
Obviously there are multiline options that could be more precise.
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https://bugs.launchpad.net/bugs/1544612
Title:
Missing fix for 1299975 claimed to be in pm-utils (1.4.1-13ubuntu0.1)
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