Bug 123603

I think I figured out whats going on.   My machine is a HP NX7010
laptop with a ATI card that is supported in 3D mode in Xorg.  I had
KDE set to use a 3D screensaver, however I had configured Xorg do use
Xinerama when docked at work (head 1 the built in display and head 2
the monitor.).

Xinerama apparently disables GL.

So after I changed screensavers from Euphoria to blank screen I dont
get crashes any more.

I'm seeing crashes running 3D screensavers on my Fujitsu Lifebook
S6120 Centrino laptop.  This is with xorg-x11-6.7.0-2 and kernels
kernel-2.6.5-1.358 through kernel-2.6.6-1.383. The relevant part of
lspci looks like:

00:00.0 Host bridge: Intel Corp. 82852/855GM Host Bridge (rev 02)
00:00.1 System peripheral: Intel Corp. 855GM/GME GMCH Memory I/O
Control Registers (rev 02)
00:00.3 System peripheral: Intel Corp. 855GM/GME GMCH Configuration
Process Registers (rev 02)
00:02.0 VGA compatible controller: Intel Corp. 82852/855GM Integrated
Graphics Device (rev 02)

and the kernel log says:
May 25 10:49:41 localhost kernel: [drm] Initialized i830 1.3.2
20021108 on minor 0: 
May 25 10:49:41 localhost kernel: [drm] Initialized i830 1.3.2
20021108 on minor 1: 
May 25 10:49:41 localhost kernel: mtrr: base(0xd8020000) is not
aligned on a size(0x300000) boundary

I'm seeing a problem similar to the original report.  However,  I'm
running an Athlon XP 1700 with a Matrox G550 agp card.  Using only one
head.
Several times I've come back to find X has either crashed and bounced
me back to the login screen or is hung running with 100% of the
processor.  A kill -9 on the process is necessary to return me to the
login screen.  Typically the applications that are running are Moz, 
Gaim, and Xscreensaver.  I use DPMS power settings on the monitor.  My
WM is Enlightenment 0.16.6.

Can you try the i586 kernel especially the people with Matrox cards
and report back if this makes it work.

I'm using 2.6.7 compiled from source on my box.  I compile it for
Athlon.  I also downloaded the latest Xscreensaver from jwz 4.16 and
built it from source.  After doing this I ceased experiencing this
problem.

My hunch is that the xscreensaver update did the trick.

If updating xscreensaver stops the X server or system from crashing,
it wasn't a bug in xscreensaver, but rather a bug in either the
X server (video driver likely) or kernel.  No application should
ever be able to crash the system, and while the code in xscreensaver
could theoretically be found that triggers the problem, it isn't the
cause of the problem.  Working around that in the screensaver, just
potentially leaves faulty code either in the driver or kernel for
something else to eventually trigger.

If you've recompiled the kernel itself and the problem is not
reproduceable anymore, I would assume the root cause is a kernel
bug.  Can you set up your old setup that had the problem, and using
the original xscreensaver, try to reproduce the issue with your
new kernel?  I'm assuming this will also resolve the problem, at
which point this points to a bug in the kernel mga DRM or some other
kernel interaction I believe.  Of course that's not conclusive yet
without more info, but it's a reasonable hypothesis for now.

Thanks in advance,
TTYL

*** This is an automated comment update ***

The X11 implementation included with Fedora Core 2 and 3, is "X.Org X11"
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Reassigning several bugs from XFree86 component to proper xorg-x11
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