Arch Linux

Erki der Loony

Member

Registered: 2009-01-12

Posts: 11

pm-suspend only after key press

Hi!

I'm running current Arch with 2.6.27 stock kernel on my Acer Aspire 5520 notebook. If I do "pm-suspend" the screen gets black and only the cursor is blinking at the top line. But the notbook only turns off if i press a key on the keyboard a few times (think about how long I tried to figure this out)!

Also if I "poweroff" the normal poweroff sequence is shown on console until the last line states "Power down". It remains like this until I press a key on the keyboard. Then I can see a line stating "Power down" for a fraction of a second before power finally turns off.

I think this is quite weird! Has someone experienced something similar? Or does someone even have a fix for it? Because it's quite annoying!

Erki

PS: I'm not sure if it might help if I post a log file of some kind. If you know which one might help, please let me know!

Erki der Loony

Member

Registered: 2009-01-12

Posts: 11

Re: pm-suspend only after key press

Hi again!

This is still an issue after the recent upgrade to 2.6.28.1 (which I hoped might fix this but didn't).

Still no one with an Acer laptop who has similar problems or someone who can imagine what is the cause for this?

micsa

Member

Registered: 2009-02-04

Posts: 2

Re: pm-suspend only after key press

Hi,

I have an Aspire 5520 too, running 2.6.28.1 and 2.6.29-rc3 and having the same issue: suspend to ram needs one or more keypress to power down.
Adding "clocksource=jiffies" to the kernel parameter list resolves this issue, but who wants to use jiffies as clocksource.
Tried tsc as clocksource too, but it seemingly doesn't work correctly with cpufreq (sleep 10 waits up to 20+ seconds when the CPU is running at 800MHz).

micsa

Last edited by micsa (2009-02-04 12:27:24)

Erki der Loony

Member

Registered: 2009-01-12

Posts: 11

Re: pm-suspend only after key press

What is the problem with the jiffies timer? I don't quite understand what it does. And a quick google search only revealed that a jiffy is a time interval of some kind. Why should I not switch to clocksource=jiffies?

micsa

Member

Registered: 2009-02-04

Posts: 2

Re: pm-suspend only after key press

The jiffies basically an integer, incremented on every timer interrupt. It is not accurate, for example when using a 250Hz timer (CONFIG_HZ_250) the ping measures the roundtrip time only in 4ms resolution instead of usec precision. I'm using it too, because of the suspend to ram