linux-kernel - Re: powersaving-related hangs on T460s

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Message-ID: <alpine.LRH.2.21.1801110938370.28575@math.ut.ee>
Date:   Thu, 11 Jan 2018 09:39:57 +0200 (EET)
From:   Meelis Roos <mroos@...ux.ee>
To:     Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: powersaving-related hangs on T460s

> I tried 4.15-git on my Thinkpad T460s laptop. It is working but I have 
> problems waking up the computer after it has been idle.
> 
> There should be no suspend (to keep network connections alive) when the 
> laptop is on AC power, even when the lid is closed. In dmesg, I have 
> seen no indication of suspend happening. It is configured to just lock 
> the screen when the lid is closed.
> 
> Normally, I have to press a key after opening the lid to unblank the 
> screen and get to password prompt. Usually this works but sometimes 
> there is no response - power LED is on that is all, holding down power 
> button is the only way out.
> 
> Sometimes it happens overnight, sometimes it is alive in the morning. It 
> almost never happens with short 5-15 minutes breaks but it can happen 
> for about hour long breaks. There is no reliable way to reproduce the 
> problem.

I seem to have found a better reproducer - when running on battery, it 
will hang after some minutes, with screen on. It just hangs.

-- 
Meelis Roos (mroos@...ux.ee)