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Slow suspend wake-up on T420

T400/T410/T420 and T500/T510/T520 series specific matters only
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ess3nt1al
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Joined: Thu May 28, 2020 2:16 am
Location: Kiev, Ukraine

Slow suspend wake-up on T420

#1 Post by ess3nt1al » Thu May 28, 2020 4:11 am

About a week ago i got myself used Thinkpad T420 with ssd, 2gb of ram and Windows 7 with all drivers installed on it. I installed EndeavourOS (arch linux) on it, and every time i opened it in suspend mode, the screen turned on instantly and i could use it. Now it turns on only after 6-8 seconds. Although it is a pretty good time, it's still annoying to me and i want to fix it. I had swap turned off when it was working well, i have it off still. Upgrading to 6 gb of ram did not help. Reinstalling the system also did not help.

theterminator93
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Re: Slow suspend wake-up on T420

#2 Post by theterminator93 » Thu May 28, 2020 8:31 am

How is it suspending? Is it going to S2/S3 (suspend to RAM) or S4 (suspend to disk/hibernate)? S4 will take longer to resume from (esp. if you add RAM) because of the need to access the disk.
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ess3nt1al
Posts: 2
Joined: Thu May 28, 2020 2:16 am
Location: Kiev, Ukraine

Re: Slow suspend wake-up on T420

#3 Post by ess3nt1al » Thu May 28, 2020 9:13 am

Thank you for your reply.

I checked my dmesg and journalctl and figured out, that i'm using "deep" suspend mode which refers to S3. I think it was S2 or S1 before, which are faster, so i am now researching how to change it on arch linux

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