Sleep/Standby/Suspend to RAM + turning LCD off = not working

mpeg4v3 · Tux's lil' helper Joined: 16 Sep 2003 Posts: 139

Hi all,
I just got a Dell Latitude C600, and have been getting everything setup. However, I've run across a problem in the form of being able to close the lid and have the laptop go into both sleep mode, as well as turn off the LCD.
I can get it to do one or the other when the lid closes, but not both. If it goes into sleep mode, the screen stays at "stopping tasks" and sits there. If I turn off the screen with xset dpms force off, it won't go into sleep mode.
I've tried:
/usr/X11R6/bin/xset dpms force off && echo -n standby >> /sys/power/state

in a lid detection event, and I can see it turn the LCD off when I close the LID, but it immediately turns the display back on to show the "Stopping Tasks..." portion of the computer going to sleep.

I'm really quite clueless as to how I can get it to do BOTH from an ACPI action event rather than just one. Does anyone have any suggestions?

mpeg4v3 · Tux's lil' helper Joined: 16 Sep 2003 Posts: 139

Anyone have any ideas? I've got no clue how to make this laptop both turn off the display & sleep at the same time. Whenever I close the lid, it displays "Stopping tasks...", and doesn't do the xset command following it. If I do the xset command before I put it to sleep, the display still turns back on to show the "Stopping tasks..." line, and won't turn back off.

mjans · n00b Joined: 26 Nov 2003 Posts: 4

The "Stopping tasks" is shown in a console, not in X. What you do is turning off the screen for that X session only. After that you go to sleep, which will switch to a console and turns your screen on. Maybe when you close the lid after that, the screen will turn off. Otherwise try another sleep state. I'm using suspend-to-RAM, which is also very fast and uses less power consumption when in sleep mode, because it turns off all hardware except your memory.

Getting suspend-to-RAM working can be difficult. Otherwise you could use Software Suspend 2 (also called swsusp), which suspends to disk. This is a great alternative and works on allmost every laptop. success!

sohni · n00b Joined: 16 Feb 2005 Posts: 8

I am using echo -n mem line to get IBM X23 to standby.

Console does the process OK and turns blank. LCD lamp stays burning, but turns off, if lid is closed.

Maybe you should check also your kernel settings and do sync before standby.

Higgaion · n00b Joined: 01 Dec 2005 Posts: 43 Location: Oklahoma

I'm in the same boat here with my Dell C600. I've finally gotten it to both suspend to mem and wake back up, but when it is suspended the back light stays on. the screen blanks to a blindingly bright white. Then, when i press the power button, it first turns off the screen, then it revives correctly and turns it back on! I havn't tried any of the suspend to disk stuff yet. My kernel config is exactly like the one on the guide: http://www.gentoo.org/doc/en/power-management-guide.xml

I'm using the hibernate-script and i've got the suspend key calling hibernate-mem correctly.
Any ideas?
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