Hacking LMDE

Archived topics about LMDE 1 and LMDE 2
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Re: Hacking LMDE

Post by terdon »

HTD wrote: Would you like to wake up your pc from sleep with keyboard or mouse? It's easy:

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((echo '#!/bin/sh' && sed -rn 's/^.*(USB[0-9E]+|EUSB).*$/echo \1 > \/proc\/acpi\/wakeup/pg' /proc/acpi/wakeup) | sudo tee /etc/pm/sleep.d/05_usb && sudo chmod +x /etc/pm/sleep.d/05_usb)
Hi, this command won't work on my laptop. If I read it correctly, the sed command will substitute lines matching USB with the "echo 1 ..." command. I have no lines containing that pattern on my /proc/acpi/wakeup. I guess this is because I am running LMDE on a laptop. I do have a keyboard connected but, believe it or not, it is an old PS2 one. So, the question is, which line in my /proc/acpi/wakeup file refers to my laptop keyboard, which refers to the external one and how can I get the above command to work?

I guess the idea here is to create a bash script at /etc/pm/sleep.d/05_usb which will echo "1" into /proc/acpi/wakeup. Is that correct? Or did you mean "$1" for capturing the sed command's output? Or am I missing the point entirely?


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Device	S-state	  Status   Sysfs node
AGP	  S4	*disabled  pci:0000:00:01.0
P0P1	  S4	*disabled  pci:0000:00:1e.0
HDEF	  S4	*disabled  pci:0000:00:1b.0
RP01	  S4	*disabled  pci:0000:00:1c.0
PXSX	  S4	*disabled  
RP02	  S4	*disabled  pci:0000:00:1c.1
PXSX	  S4	*disabled  pci:0000:03:00.0
RP03	  S4	*disabled  pci:0000:00:1c.2
PXSX	  S4	*disabled  pci:0000:04:00.0
RP04	  S4	*disabled  pci:0000:00:1c.3
PXSX	  S4	*disabled  
RP05	  S4	*disabled  
PXSX	  S4	*disabled  
RP07	  S4	*disabled  
PXSX	  S4	*disabled  
RP08	  S4	*disabled  
PXSX	  S4	*disabled  
GLAN	  S4	*enabled   pci:0000:00:19.0
PEG3	  S4	*disabled  
PEG4	  S4	*disabled  
PEG5	  S4	*disabled  
PEG6	  S4	*disabled  
EHC2	  S3	*disabled  pci:0000:00:1a.0
EHCI	  S3	*disabled  pci:0000:00:1d.0
LID	  S3	*enabled   
PBTN	  S3	*enabled   

PS. What is this file anyway? What does this mean?

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$ file /proc/acpi/wakeup 
/proc/acpi/wakeup: empty
Using more or cat to see the file shows me the contents perfectly. Copying it to my $HOME results in:

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$ file wakeup 
wakeup: ASCII text
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Re: Hacking LMDE

Post by HTD »

This is not a normal file. It's procfs thingie which behaves a little as regular file, but it is not. It's a simple way for reading and writing to system components like drivers, daemons and such.
/proc/acpi/wakeup "file" contains list of device names which will be used for waking up the pc.

You can write to this file to test the changes immediately, but real thing is done there:
/etc/pm/sleep.d/05_usb - this is the real file, which contains device names which will be added to /proc/acpi/wakeup each time system goes to sleep.

How do I got the list of device names? Just cat /proc/acpi/wakeup . The rest of the magic line do all the voodoo removing all the text we don't need from this output - and puts it into /etc/pm/sleep.d/05_usb file. The file needs to have chmod +x. That's all. You can change the filter pattern in magic line to include other devices like this:

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((echo '#!/bin/sh' && sed -rn 's/^.*(PS2K|USB[0-9E]+|EUSB).*$/echo \1 > \/proc\/acpi\/wakeup/pg' /proc/acpi/wakeup) | sudo tee /etc/pm/sleep.d/05_usb && sudo chmod +x /etc/pm/sleep.d/05_usb)
...to include PS2 keyboard. When I figured it out I was quite new to linux shell magic and used "sed" and "tee" for the first time in my life :) So it took me some time to read the manuals, but it was fun :) I would never try it, but as a web programmer I use regular expressions everyday, so I thought - damn it - I don't know nothing about linux shell but I know regexes so I HAVE to make it! :)

And well, this is the way to go - instead of telling you to do a lot of things to change the system sleep settings (which would be hard to tell and hard to follow) I just wrote it as a single line which does everything. Finds device names, filters them, writes them to a file, and changes the file permission :). Oh, the "tee" is because "sudo echo" doesn't work (long story) :)

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