linux-kernel - Re: sleepy linux 2.6.23-rc9

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Message-ID: <470AD0C2.9060709@zytor.com>
Date:	Mon, 08 Oct 2007 17:52:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Clemens Koller <clemens.koller@...gramm.de>
CC:	Pavel Machek <pavel@....cz>, tglx@...utronix.de,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: sleepy linux 2.6.23-rc9

Clemens Koller wrote:
>>
>> 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.
> 
> Is the effect a beat that it has roughly the frequency of your Notebooks
> screen refresh rate (60Hz)? (in german: Schwebung)
> 
>> The effect is so nice that I thought about youtube ;-). Thinkpad
>> x60.. question is, how to debug it? 
> 
> No idea... check where the register of the HW cursor blink rate
> gets written? But as it seems to be so nice, please submit a patch
> which enables this for all platforms. ;-)
> 

For the VESA framebuffer I would assume the cursor blinking is done in 
software (if done at all.)

	-hpa
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