Subject: Re: The radeon framebuffer device panics init (on i386)
To: Vincent <10.50@free.fr>
From: Michael Lorenz <macallan@netbsd.org>
List: tech-kern
Date: 12/20/2006 14:50:57
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Hello,

On Dec 20, 2006, at 13:11, Vincent wrote:

> Michael Lorenz scriv=F2 :
>
>>> That 1024x768@60 Hz happens to be exactly the same videomode I use=20=

>>> with X (which obviously works since I am writing this mail ;)). I'll=20=

>>> try to see if by chance something is wrong with the dividers or that=20=

>>> kind of stuff.
>> Please do that.
>
> That was, as we say over here in France, a Gascon's promise. I cannot=20=

> keep it because I lack the proper tool to dump the registers of the=20
> radeon chip. I have no real documentation, at that. Does anybody know=20=

> of pointer to a kind of datasheet or something?

You could just mail me your XFree86.0.log - maybe it contains some=20
hints.

>> Possible - that happens on R3xx-based chips and I committed a=20
>> workaround a few days ago. To enable it look into=20
>> radeonfb_init_screen():
>>     if (!IS_R300(dp->rd_softc)) {
>>         ri->ri_ops.putchar =3D radeonfb_putchar;
>>     }
>> and make sure that radeonfb_putchar isn't used ( just comment it out=20=

>> or something )
>> This will lead to all characters being drawn in software. Scrolling=20=

>> and so on will still be done using the blitter.
>
> Does nothing. I guess it is related to clocking, because before=20
> blinking out, the screen mangles what is already displayed.

It does try to switch video modes and for some reason it does that in=20
several steps with debug output in between. Does the screen just turn=20
black or does it go into power saving mode?

have fun
Michael
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