Suspend to Disk/RAM
Posted Jul 20, 2005 17:34 UTC (Wed) by danm628
In reply to: The 2005 Linux Kernel Developers' Summit
Parent article: The 2005 Linux Kernel Developers' Summit
I suspect many people want what I can get from XP on my work notebook (IBM Thinkpad T40). When the lid is shut it does a suspend to RAM, when the lid is opened the system comes up within a couple of seconds. When the system stays in suspend to RAM for a period (I have it set to 15 minutes) it wakes up and does a suspend to disk. I go for weeks without shutting down and rebooting my work notebook. (Actually it can't go for weeks without a reboot, since there will be at least one patch pushed by IT which requires a reboot.)
My home notebook (Thinkpad T41) running Ubuntu isn't quite as flexible. I can do suspend to RAM but there is no option to automatically suspend to disk after staying in suspend to RAM for a period. (Or if there is an option I didn't find it -- which would be a GUI bug not a kernel issue.) Suspend to disk works and it is what I normally do, that way the system comes up fairly quickly when I want to use it. Windows is a *LOT* prettier to watch come out of suspend to disk. I don't mind the odd screen flashes, etc. while the display driver. But I'm sure my non-programmer friends would prefer a nice progress bar instead of kprintf messages.
So what I really want is both suspend to disk and RAM to work reliably. I want to be able to open my notebook and quickly get to work, the definition of quickly depends on how long the notebook has been off (couple of seconds for suspend to RAM or 10 to 20 seconds for suspend to disk). I like being able to shut the lid and know that the system will automatically go to the appropriate low power state. I don't want to have to decide how long I'm going to want it to suspend for and which type of suspend it should do.
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