Re: VIA KT400A and AGP/DRI?

Stefan Walter, 13.01.04, 16:20h CET:

> I just replaced an old mainboard with a new one with a VIA KT400A
> chipset. Is it possible to get DRI working with that? It used to work
> with the old board (different chipset), but I had to turn off DRI in my
> X configuration for the new one, as it made X/the system freeze/hang
> immediately.

The problem still persists in a -CURRENT as of February 14th (due to the
recent threading related changes, all ports have been recompiled as
well). It doesn't freeze but panics when I start X with DRI enabled. The
monitor is in standby right after switching from the console, so I don't
see anything while it's writing the core.
A 'gdb -k /boot/kernel/kernel ./vmcore.0' outputs the following:

***
GNU gdb 5.2.1 (FreeBSD)
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-undermydesk-freebsd"...(no debugging symbols found)...
panic: page fault
panic messages:
---
Fatal trap 12: page fault while in kernel mode
fault virtual address	= 0x1
fault code		= supervisor write, page not present
instruction pointer	= 0x8:0xc0500004
stack pointer	        = 0x10:0xe1959b8b
frame pointer	        = 0x10:0xe1959b90
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, def32 1, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 3
current process		= 49093 (XFree86)
trap number		= 12
panic: page fault
at line 819 in file /usr/src/sys/i386/i386/trap.c

syncing disks, buffers remaining... 3842 3842 3841 3841 3841 3839 3839 3838 3838 3838 3837 3838 3837 3837 3837 3837 3837 3837 3837 3837 3837 3837 3837 3837 3837 3837 3837 3837 3837 3837 3837 3837 
giving up on 1099 buffers
Uptime: 6h41m50s
Dumping 511 MB
 16 32[CTRL-C to abort] [CTRL-C to abort] [CTRL-C to abort] [CTRL-C to abort]  48 64 80 96 112 128 144 160 176 192 208 224 240 256 272 288 304 320 336 352 368 384 400 416 432 448 464 480 496
---
Reading symbols from /boot/kernel/acpi.ko...(no debugging symbols found)...done.
Loaded symbols for /boot/kernel/acpi.ko
Reading symbols from /boot/kernel/blank_saver.ko...(no debugging symbols found)...done.
Loaded symbols for /boot/kernel/blank_saver.ko
#0  0xc05438b0 in doadump ()
(kgdb) quit
***

I am not too familiar with kernel hacking, so suggestions/hints are
welcome. My XF86Config and the output of dmesg and pciconf are still
available at [1].

Stefan

[1]: http://www.gegenunendlich.de/stuff/kyuzo/