linux-kernel - Re: sleepy linux 2.6.23-rc9

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Message-Id: <1191904413.6083.4.camel@daplas>
Date:	Tue, 09 Oct 2007 12:33:33 +0800
From:	"Antonino A. Daplas" <adaplas@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	tglx@...utronix.de, kernel list <linux-kernel@...r.kernel.org>
Subject: Re: sleepy linux 2.6.23-rc9

On Tue, 2007-10-09 at 00:05 +0200, Pavel Machek wrote:
> Hi!
> 
> I played with powertop a bit, and found a fairly interesting failure
> mode. If I boot init=/bin/bash vga=1, I get ~2 wakeups a second, nice.
> 
> When I boot init=/bin/bash vga=791 (vesa framebuffer), most wakeups
> are caused by cursor painting (I should fix that some day, I
> guess). But... the cursor blinking does not even work properly!
> 
> It blinks at normal speed, then (randomly) it blinks slowly, then gets
> back to normal speed, then inserts longer delay.
> 
> The effect is so nice that I thought about youtube ;-). Thinkpad
> x60.. question is, how to debug it? 

The cursor blinking is done by software via a timer. It's in
drivers/video/console/fbcon.c.

With the latest -rc kernel you can turn off the blinking with

echo 0 > /sys/class/graphics/fbcon/cursor_blink

Tony


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