Re: Help debugging kernel together with X

Thanks Glen,

Despite having fought many battles with the dreaded X.org update ¬¬,
this seems not to be the problem now. I tried to install a new graphics
card some time ago, before the upgrade and the result was the same.

My concern right now is the behaviour of Watchdogs, I'll start a new,
more specific thread.

Thanks,
Fernando

El mar, 26-05-2009 a las 11:39 -0400, Glen Barber escribió:
Hi, Fernando

2009/5/26 Fernando Herrero Carrón <fhcarron@xxxxxxxx>:
Hi list,

I would like to ask for some help debugging the kernel.

Here is the problem:

I have a computer about five years old with an on-board graphics card
(SiS 661). I am trying to install an ATI Radeon 128 on the AGP port.
FreeBSD (FreeBSD 7.2-STABLE #10: Tue May 26 15:08:39 CEST 2009) is able
to start DRM and AGP without trouble. However, whenever I start X (X.Org
X Server 1.6.1; Release Date: 2009-4-14; Build Date: 11 May 2009
12:03:27PM) the system freezes with a blank screen with some apparent
noisy green dots on it (reproducible, however). It does not panic, nor
reboot.

Now I suspect there is some problem on the AGP bridge driver since linux
can run X without trouble (i.e. hardware and BIOS are ok). I have found
someone reporting problems with this bridge long time ago with no
answers (http://www.nabble.com/agp-on-sis-661-td1446998.html).

So here I am trying to figure out where the system freezes. I have
recompiled my kernel adding the following options:

options KDB
options DDB
options MP_WATCHDOG
options SW_WATCHDOG

I am able to enter the debugger with ctrl+alt+esc from a console. So
what I am trying to do is to have watchdogd time out and the debugger
make a dump:

ddb script kern.enter.watchdog=call doadump; reboot

However, when I start X no timeout occurs, and the system stays freezed.
Am I missing something on the workings of watchdogd?


What you're describing does not appear to be a kernel problem; it
sounds like the typical 'Xorg update from hell' problem most
experienced a while back.

Have a look at /usr/ports/UPDATING, and search for 'AllowEmptyInput'.

Adding the following to xorg.conf should correct the problem:

Section "ServerFlags"
option "AllowEmptyInput" "off"
option "AutoAddDevices" "off"
EndSection

HTH


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