[ltp] t40 apm suspend --- strange problem

[Bob Alexander]

Franz Rühmland wrote:
> Bob Alexander wrote:
> 
>> Yesterday I left the machine in the suspended state overnight to 
>> measure the power consumptions (13% of the high capacity battery in 14 
>> hours).
>>
>> Further testing seems to indicate that if I suspend and a few minute 
>> after resume, all works fine but if the machine stays suspended for 
>> longer times the resume will be broken.
> 
> 
> I've just discovered the same thing. I usually leave my T41 suspended to 
> RAM (APM) when not using it and up until recently it have been working 
> fine.
> 
> Recently I made some changes to my kernel config (2.6.9-gentoo-r1), and 
>  (if memory serves me right) I started noticing the same behaviour as you.
> 
> The changes were: PCMCIA changed to module instead of compiled in, 
> parallel port support, LVM support and Bluetooth support.
> 
> I will now be testing my old config to see if it works OK. Then I will 
> start troubleshooting the new stuff.
> 
> Also, have you found a minimum time in suspension after it reliably 
> fails to come back up?
> 
> /
> Franz
> 

Dear Franz,
I am sorry for you but for me it's better to be in two :)

My solution for now is to use ACPI with swsusp2 which will always resume 
correctly and solve the horrendous power drain of the ACPI suspend to RAM.

I did not find the minimum time for the wrong state to kick in. I would 
say that a suspend of around 30 mins works and over that it doesn't but 
its only a vague impression.

I hope I did not mess around with configs too much but my 2.6.9 config 
should have the following:

PCMCIA=y
YENTA=y
#CONFIG_PARPORT is not set <- do not use LPT1
CONFIG_MD=y -> need all this to use my LVM partitions; NB My root 
partition is NOT on an LVM volume
CONFIG_BLK_DEV_MD=m
CONFIG_MD_LINEAR=m
CONFIG_MD_RAID0=m
CONFIG_MD_RAID1=m
# CONFIG_MD_RAID10 is not set
# CONFIG_MD_RAID5 is not set
#CONFIG_BT is not set <- do not use bluetooth

Let me know if I can help you out in the debugging !!!

Take care,
Bob
# CONFIG_MD_RAID6 is not set
# CONFIG_MD_MULTIPATH is not set
CONFIG_BLK_DEV_DM=m
# CONFIG_DM_CRYPT is not set
CONFIG_DM_SNAPSHOT=m
CONFIG_DM_MIRROR=m
# CONFIG_DM_ZERO is not set

> 
> These are the changes I made:
> 
> diff config-2.6.9-gentoo-r1-2 config-2.6.9-gentoo-r1-6
> 4c4
> < # Sun Nov  7 08:32:21 2004
> ---
>  > # Sun Jan  2 00:09:35 2005
> 199c199
> < CONFIG_PCMCIA=y
> ---
>  > CONFIG_PCMCIA=m
> 201c201
> < CONFIG_YENTA=y
> ---
>  > CONFIG_YENTA=m
> 248c248
> < # CONFIG_PARPORT_1284 is not set
> ---
>  > CONFIG_PARPORT_1284=y
> 455c455,464
> < # CONFIG_MD is not set
> ---
>  > CONFIG_MD=y
>  > # CONFIG_BLK_DEV_MD is not set
>  > CONFIG_BLK_DEV_DM=y
>  > # CONFIG_DM_CRYPT is not set
>  > CONFIG_DM_SNAPSHOT=y
>  > CONFIG_DM_MIRROR=y
>  > # CONFIG_DM_ZERO is not set
>  > # CONFIG_BLK_DEV_DM_BBR is not set
>  > CONFIG_DM_MULTIPATH=y
>  > # CONFIG_DM_FLAKEY is not set
> 597c606,628
> < # CONFIG_BT is not set
> ---
>  > CONFIG_BT=y
>  > CONFIG_BT_L2CAP=y
>  > CONFIG_BT_SCO=y
>  > CONFIG_BT_RFCOMM=y
>  > CONFIG_BT_RFCOMM_TTY=y
>  > CONFIG_BT_BNEP=y
>  > CONFIG_BT_BNEP_MC_FILTER=y
>  > CONFIG_BT_BNEP_PROTO_FILTER=y
>  > CONFIG_BT_HIDP=y
>  >
>  > #
>  > # Bluetooth device drivers
>  > #
> 
>  > CONFIG_BT_HCIUSB=y
>  > CONFIG_BT_HCIUSB_SCO=y
>  > # CONFIG_BT_HCIUART is not set
>  > # CONFIG_BT_HCIBCM203X is not set
>  > # CONFIG_BT_HCIBFUSB is not set
>  > # CONFIG_BT_HCIDTL1 is not set
>  > # CONFIG_BT_HCIBT3C is not set
>  > # CONFIG_BT_HCIBLUECARD is not set
>  > # CONFIG_BT_HCIBTUART is not set
>  > # CONFIG_BT_HCIVHCI is not set
> 790c821,822
> < # CONFIG_PRINTER is not set
> ---
>  > CONFIG_PRINTER=y
>  > # CONFIG_LP_CONSOLE is not set
> 1071c1103,1106
> < # CONFIG_USB_BLUETOOTH_TTY is not set
> ---
>  >
>  > #
>  > # USB Bluetooth TTY can only be used with disabled Bluetooth subsystem
>  > #