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From: John Baldwin <jhb@freebsd.org>
To: Daniel Eischen <deischen@freebsd.org>
Date: Mon, 22 Jun 2009 09:00:44 -0400
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org, Robert Noland <rnoland@freebsd.org>
Subject: Re: svn commit: r194540 - head/sys/dev/drm
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On Saturday 20 June 2009 12:56:40 pm Daniel Eischen wrote:
> On Sat, 20 Jun 2009, Robert Noland wrote:
> 
> > Author: rnoland
> > Date: Sat Jun 20 16:45:14 2009
> > New Revision: 194540
> > URL: http://svn.freebsd.org/changeset/base/194540
> >
> > Log:
> >  The G45 docs indicate that all G4X chips use the new framecount register.
> >
> >  Intel agrees with my reading of the docs, make it so for all G4X chips.
> >
> >  The new register also has a 32 bit width as opposed to 24 bits.  Fix
> >  things up so that the counters roll over properly.
> 
> Could this possibly fix the problem I'm seeing with the screen being
> garbage after a logout from KDE 3.x (using kdm)?  Everything works
> fine after logging in, but when you log out, the screen is left with
> garbage/lots of vertical striping.  This only happened after upgrading
> my system (and all ports) to Xorg 7.4, worked just fine before that.
> 
> agp0: <Intel 82945GM (945GM GMCH) SVGA controller> on vgapci0
> agp0: detected 7932k stolen memory
> agp0: aperture size is 256M
> vgapci1: <VGA-compatible display> mem 0xdff80000-0xdfffffff at device  2.1 
on pci0

I only started seeing this after enabling AIGLX and using if for desktop 
effects in KDE4.  Ocassionally it doesn't trash the screen on exit even in 
that case.

-- 
John Baldwin