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Subject: Re: sleepy linux 2.6.23-rc9
From: "Antonino A. Daplas" <adaplas@gmail.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: tglx@linutronix.de, kernel list <linux-kernel@vger.kernel.org>
In-Reply-To: <20071008220506.GE3484@elf.ucw.cz>
References: <20071008220506.GE3484@elf.ucw.cz>
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Date: Tue, 09 Oct 2007 12:33:33 +0800
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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