'echo -n mem > /sys/power/state' Operation not permitted error

hollywoodb · 08-17-2006, 03:13 PM

Status of /sys/power/state:

Code:

root@hb-130 ~ $ ls -l /sys/power/
total 0
-rwxrwxrwx 1 root root 0 2006-08-17 15:04 state

root@hb-130 ~ $ cat /sys/power/state
standby mem

root@hb-130 ~ $

My suspend script (many pointers found elsewhere in the forums:

Code:

#!/bin/sh

# discover video card's ID
ID=`lspci | grep VGA | awk '{ print $1 }' | sed -e 's@0000:@@' -e 's@:@/@'`

# securely create a temporary file
TMP_FILE=`mktemp /var/tmp/video_state.XXXXXX`
trap 'rm -f $TMP_FILE' 0 1 15

# switch to virtual terminal 1 to avoid graphics corruption in X
chvt 1

# write all unwritten data (just in case)
sync

# dump current data from the video card to the temporary file
cat /proc/bus/pci/$ID > $TMP_FILE

# unload modules
rmmod uhci_hcd
rmmod ehci_hcd
rmmod ipw2200

# suspend
echo -n mem > /sys/power/state

# wait
sleep 5

# restore video card data from the temporary file on resume
cat $TMP_FILE > /proc/bus/pci/$ID

# remove left-over dhcpcd pid
rm /etc/dhcpc/dhcpcd-eth*.pid

# reload modules
modprobe uhci_hcd
modprobe ehci_hcd
modprobe ipw2200

# switch back to virtual terminal 7 (running X)
chvt 7

# remove temporary file
rm -f $TMP_FILE

Output of script:

Code:

suspend.sh: line 25: echo: write error: Operation not permitted

Now I'm not sure what's holding it back...

Output of lsmod:

Code:

root@hb-130 ~ $ lsmod
Module                  Size  Used by
ipw2200                73024  0
ehci_hcd               18952  0
uhci_hcd               13580  0
rtc                     6580  0
i915                   11264  1
drm                    41236  2 i915
speedstep_centrino      4176  1
sg                     18332  0
snd_seq_oss            19200  0
snd_seq_midi_event      3456  1 snd_seq_oss
snd_seq                29264  4 snd_seq_oss,snd_seq_midi_event
snd_seq_device          3596  2 snd_seq_oss,snd_seq
snd_pcm_oss            25248  0
snd_mixer_oss          10752  3 snd_pcm_oss
xt_tcpudp               2176  1
iptable_mangle          1408  0
ip_conntrack_ftp        3824  0
xt_state                1280  3
iptable_nat             3460  0
ip_nat                  8492  1 iptable_nat
ip_conntrack           25056  4 ip_conntrack_ftp,xt_state,iptable_nat,ip_nat
iptable_filter          1408  1
ip_tables               8420  3 iptable_mangle,iptable_nat,iptable_filter
x_tables                6148  4 xt_tcpudp,xt_state,iptable_nat,ip_tables
nls_iso8859_1           3456  1
ntfs                  165652  1
video                   9732  0
thermal                 7304  3
processor              12388  2 speedstep_centrino,thermal
fuse                   21768  0
fan                     2180  0
button                  3344  0
battery                 5764  4
ac                      2308  0
b44                    13964  0
mii                     3072  1 b44
intel_agp              12572  1
agpgart                16332  3 drm,intel_agp
evdev                   5376  1
joydev                  5696  0
tsdev                   3776  0
snd_hda_intel           8340  2
ieee80211              20680  1 ipw2200
ieee80211_crypt         2432  1 ieee80211
snd_hda_codec          99632  1 snd_hda_intel
snd_pcm                45572  3 snd_pcm_oss,snd_hda_intel,snd_hda_codec
snd_timer              11908  2 snd_seq,snd_pcm
snd                    26596  9 snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_hda_intel,snd_hda_codec,snd_pcm,snd_timer
soundcore               3936  3 snd
snd_page_alloc          4616  2 snd_hda_intel,snd_pcm

Also, why no 'disk' in /sys/power/state ?
Perhaps its a kernel issue?

Pointers welcome

biophysics · 08-18-2006, 12:31 PM

I am not sure why you are giving the "-n" in the echo line. Try without it.

Also, I would recommend you to try out suspend2. It is not as complicated as it sounds like. Go to suspend2.net and download the proper patch - and get the latest stable kernel from kernel.org. apply the patches.

1. install hibernate script (from suspend2.net)
2. Test your suspend2.

Look in the wiki of suspend2 - it is written in detail. Suspend2 is NOT just fast but also reliable.

Alternatively, just install the hibernate script - try to suspend with hibernate script.

hollywoodb · 08-18-2006, 01:04 PM

I'll look into it, the 'echo' command gives the same result with or without -n

F_Ruta · 09-08-2006, 05:41 PM

Did you forget the quote around mem?
# suspend
echo -n "mem" > /sys/power/state

patrickdepingui · 10-06-2006, 07:06 AM

Did you get a solution for this yet? I am having the exact same problem...

hollywoodb · 10-08-2006, 05:34 PM

Quote:

Originally Posted by patrickdepingui

Did you get a solution for this yet? I am having the exact same problem...

Unfortunately I ended up and still am stumped. On Slackware, Zenwalk (Slackware based) this problem persists.... Including Slackware 11.0, which was recently released. One thing I did not try is patching a vanilla kernel with suspend2 (http://suspend2.net) and using that kernel.

However suspend/resume as well as hibernate work perfectly on my laptop under Fedora Core 5 and 6.

patrickdepingui · 10-09-2006, 04:04 AM

Quote:

Originally Posted by hollywoodb

Unfortunately I ended up and still am stumped. On Slackware, Zenwalk (Slackware based) this problem persists.... Including Slackware 11.0, which was recently released. One thing I did not try is patching a vanilla kernel with suspend2 (http://suspend2.net) and using that kernel.

However suspend/resume as well as hibernate work perfectly on my laptop under Fedora Core 5 and 6.

Luckily I found a solution myself two days ago...
I have a Core Duo laptop, and chances are high you do as well. For hibernate and standby to work on a dual core system, the kernel needs support for "hotpluggable cpu's". I didn't had this enabled in my kernel config...

When patching the kernel with suspend2, they automatically select this option, but I believe that it is not necessary to suspend2 if you don't want to...

After adding the CONFIG_HOTPLUG_CPU option, I was able to write to /sys/power/state ...
Hopefully this works for you too...

hollywoodb · 10-09-2006, 02:45 PM

Quote:

Originally Posted by patrickdepingui

Luckily I found a solution myself two days ago...
I have a Core Duo laptop, and chances are high you do as well. For hibernate and standby to work on a dual core system, the kernel needs support for "hotpluggable cpu's". I didn't had this enabled in my kernel config...

When patching the kernel with suspend2, they automatically select this option, but I believe that it is not necessary to suspend2 if you don't want to...

After adding the CONFIG_HOTPLUG_CPU option, I was able to write to /sys/power/state ...
Hopefully this works for you too...

Like I said, I didn't try suspend2, although I suspect it would have worked based on the information I've seen regarding it.

Actually my system is a Pentium M 1.8GHz, single core, no hyper-threading or anything fancy like that.