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From: Benjamin Herrenschmidt <>
To: "Kristofer T. Karas" <>
	Marcelo Tosatti <>,
	Linux Kernel Mailing List <>
Subject: Re: Radeon in LK 2.4.21pre7
Date: 22 Jul 2003 14:55:14 +0200	[thread overview]
Message-ID: <1058878512.532.10.camel@gaston> (raw)
In-Reply-To: <1058679793.10948.47.camel@ktkhome>

On Sun, 2003-07-20 at 07:43, Kristofer T. Karas wrote:
> Ben, Ani, et al,
> Just tried Linux kernels 2.4.21pre6 and pre7 with my Radeon 8500LEE and
> have had some dreadful corruption problems related to pixel clearing
> during scroll and ypan.  This is probably old news to you; so <aol>me
> too</aol>.  I first noticed this in the -ac kernels, but a variant is
> now in mainline -pre.
> Problem #1:  When scrolling, radeonfb fails to erase the portion of the
> screen at the bottom, leaving all sorts of random pixels in the bottom
> line.  Further scrolling propagates these pixels upwards.
> See
> (Sorry for camera-shake; hand-held in dim room...)

This looks like erase not working properly... This usually happens
after switching back from X as X tends to leave some garbage in some
engine registers, and is usually cured by switching to another console
(this is why I tend to force-reinit the accel engine on console switch).

Since your problem seem to not depend on XFree, I suspect something
else hairy is going on with the engine, I don't know what yet though,
I'll try to find some clue.

In the meantime, can you send me a dmesg output ?


  reply	other threads:[~2003-07-22 12:40 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-20  5:43 Radeon in LK 2.4.21pre7 Kristofer T. Karas
2003-07-22 12:55 ` Benjamin Herrenschmidt [this message]
2003-07-25  2:03   ` Kristofer T. Karas
2003-08-01 10:43 ` Benjamin Herrenschmidt
2003-07-20 20:28 Lars Ehrhardt

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