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From: Panagiotis Papadakos <papadako@ics.forth.gr>
To: linux-acpi@vger.kernel.org
Subject: Sony CR21/Z laptop (Latency problems related to ACPI?)
Date: Mon, 23 Apr 2012 15:18:48 +0300	[thread overview]
Message-ID: <5612856.clGBGkmtMC@cray-7> (raw)

Hello.

I have been using a cr21/z laptop which probably has
acpi related problems that introduce latency. I noticed
it because a recent update in my Ubuntu precise
makes my system's clock stay behind, and freezes
my laptop when there are no mouse or keyboard actions.

Somehow it looks related to https://bugzilla.kernel.org/show_bug.cgi?id=20172
 
If I boot my kernel with noapictimer clocksource=jiffies irqpoll
options the system reacts to my actions instantly. It is the first
time that I have exprerience lag free reactions from my system.
Unfortunately there are spikes of 100% CPU usage, due to irq polling I assume,
which makes my system less power efficient.

Is there any case that we can somehow fix this problem?

I am using latest git kernel. The same problem also exists
in current Ubuntu precise 3.2 kernel.

Thank you in advance.

Panagiotis Papadakos

             reply	other threads:[~2012-04-23 12:29 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-23 12:18 Panagiotis Papadakos [this message]
2012-04-23 19:37 ` Sony CR21/Z laptop (Latency problems related to ACPI?) Panagiotis Papadakos

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