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suspend no longer works after upgrading something: Samsung N220


I was hoping somebody could suggest where to start looking to try to
sort out a problem with my laptop.  I have a Samsung N220 which has been
running Debian testing+unstable for over a year now.  I have been able
to suspend (not hibernate) usually successfully most of this time.
However, all of a sudden, last week, suspend is no longer "available".
I have upgraded something that has removed this capability.

If I hit the "sleep" button, I get a dialogue box saying "Failed to
suspend [...] Cannot suspend."

Can somebody suggest what might have caused me to lose the suspend

I am running kernel 2.6.38-2-686.

The acpi related packages, all up to date re: testing, installed on this
system are as follows:

--8<---------------cut here---------------start------------->8---
$ dpkg --list '*acpi*'
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name              Version           Description
ii  acpi              1.5-2             displays information on ACPI devices
ii  acpi-fakekey      0.138-9           tool to generate fake key events
ii  acpi-support      0.138-9           scripts for handling many ACPI events
ii  acpi-support-base 0.138-9           scripts for handling base ACPI events such as the 
ii  acpid             1:2.0.8-4         Advanced Configuration and Power Interface event d
ii  acpitail          0.1-3             Show ACPI information in a tail-like style
ii  acpitool          0.5.1-2           command line ACPI client
ii  kacpimon          1:2.0.8-4         Kernel ACPI Event Monitor
ii  libacpi0          0.2-4             general purpose library for ACPI
ii  yacpi             3.0-2             ncurses based acpi monitor for text mode
--8<---------------cut here---------------end--------------->8---

I am not sure what other packages to look at or whether I need to
configure something differently for acpi.  The only options I have with,
for instance, gnome-power-manager, are shutdown and restart.

I see nothing specific in any of the log files, although I must admit
that I am not sure what I should be looking for.  For instance, I see 

--8<---------------cut here---------------start------------->8---
[    0.222695] pnp: PnP ACPI: found 9 devices
[    0.222700] ACPI: ACPI bus type pnp unregistered
[    0.222707] PnPBIOS: Disabled by ACPI PNP
[    1.636206] ACPI: Lid Switch [LID0]
[    1.690691] ACPI: Power Button [PWRB]
[    1.690953] ACPI: Sleep Button [SLPB]
[    1.691172] ACPI: Power Button [PWRF]
[    1.748239] ACPI: Thermal Zone [TZ00] (24 C)
--8<---------------cut here---------------end--------------->8---

in the dmesg output. There are some error messages which I do not

--8<---------------cut here---------------start------------->8---
[    0.203219] ACPI Error: [CAPB] Namespace lookup failure, AE_ALREADY_EXISTS (20110112/dsfield-143)
[    0.203235] ACPI Error: Method parse/execution failed [\_SB_.PCI0._OSC] (Node f682ee88), AE_ALREADY_EXISTS (20110112/psparse-536)
[    0.203261]  pci0000:00: Requesting ACPI _OSC control (0x1d)
[    0.203392] ACPI Error: [CAPB] Namespace lookup failure, AE_ALREADY_EXISTS (20110112/dsfield-143)
[    0.203406] ACPI Error: Method parse/execution failed [\_SB_.PCI0._OSC] (Node f682ee88), AE_ALREADY_EXISTS (20110112/psparse-536)
--8<---------------cut here---------------end--------------->8---

Any suggestions very welcome indeed!


: Eric S Fraga (GnuPG: 0xC89193D8FFFCF67D) in Emacs + No Gnus v0.16

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