(I'm not subscribed to linux-kernel currently, please Cc: me any replies.)
I recently upgraded from 2.5.75 (which I felt did not have good interactive
response in some circumstances compared to 2.4.21) to 2.6.0-test4.  (In
all cases, Linus trees, unpatched.)

However, 2.6.0-test4 locks up hard just after loading the PS/2 mouse stuff.
Unfortunately none the boot messages make it to disk since I don't get far
enough in the boot process for syslog to turn on.

The only change I think could be significant over my 2.5.75 configuration
is that I enabled tagged command queuing for IDA (and I get a message that
it's enabled during boot - I have an IBM disk.)

Here's the output of lspci (after booting with 2.4.21):

00:00.0 Host bridge: Silicon Integrated Systems [SiS] 735 Host (rev 01)
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] SiS 530 Virtual PCI-to-PCI bridge (AGP)
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] 85C503/5513
00:02.2 USB Controller: Silicon Integrated Systems [SiS] SiS7001 USB Controller (rev 07)
00:02.3 USB Controller: Silicon Integrated Systems [SiS] SiS7001 USB Controller (rev 07)
00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev d0)
00:03.0 Ethernet controller: Silicon Integrated Systems [SiS] SiS900 10/100 Ethernet (rev 90)
00:0b.0 FireWire (IEEE 1394): Texas Instruments TSB12LV23 IEEE-1394 Controller
00:0f.0 Multimedia audio controller: Ensoniq 5880 AudioPCI (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation NV11DDR [GeForce2 MX 100 DDR/200 DDR] (rev b2)

Here's the output from "hdparm -i", in case this is a TCQ issue:
/dev/hda:
 Model=IC35L080AVVA07-0, FwRev=VA4OA52A, SerialNo=VNC402A4L5XTJA
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=52
 BuffType=DualPortCache, BuffSize=1863kB, MaxMultSect=16, MultSect=16
 CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=160836480
 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1:  2 3 4 5

My .config file is attached.

What other info can I provide to help diagnose this issue?

Thanks!
	Dale
-- 
Dale E. Martin, Clifton Labs, Inc.
Senior Computer Engineer
dmartin@cliftonlabs.com
http://www.cliftonlabs.com
pgp key available