Distribution:
Gentoo

Hardware Environment:
0000:00:00.0 Host bridge: Intel Corp. 82845 845 (Brookdale) Chipset Host Bridge
(rev 04)
0000:00:01.0 PCI bridge: Intel Corp. 82845 845 (Brookdale) Chipset AGP Bridge
(rev 04)
0000:00:1d.0 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #1) (rev 02)
0000:00:1d.1 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #2) (rev 02)
0000:00:1d.2 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #3) (rev 02)
0000:00:1e.0 PCI bridge: Intel Corp. 82801 Mobile PCI Bridge (rev 42)
0000:00:1f.0 ISA bridge: Intel Corp. 82801CAM ISA Bridge (LPC) (rev 02)
0000:00:1f.1 IDE interface: Intel Corp. 82801CAM IDE U100 (rev 02)
0000:00:1f.3 SMBus: Intel Corp. 82801CA/CAM SMBus Controller (rev 02)
0000:00:1f.5 Multimedia audio controller: Intel Corp. 82801CA/CAM AC'97 Audio
Controller (rev 02)
0000:00:1f.6 Modem: Intel Corp. 82801CA/CAM AC'97 Modem Controller (rev 02)
0000:01:00.0 VGA compatible controller: nVidia Corporation NV17 [GeForce4 440
Go] (rev a3)
0000:02:07.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A IEEE-1394a-2000
Controller (PHY/Link)
0000:02:08.0 Ethernet controller: Intel Corp. 82801CAM (ICH3) PRO/100 VE (LOM)
Ethernet Controller (rev 42)
0000:02:0a.0 CardBus bridge: Texas Instruments PCI1410 PC card Cardbus
Controller (rev 01)
0000:02:0b.0 CardBus bridge: Toshiba America Info Systems ToPIC100 PCI to
Cardbus Bridge with ZV Support (rev 32)
0000:02:0b.1 CardBus bridge: Toshiba America Info Systems ToPIC100 PCI to
Cardbus Bridge with ZV Support (rev 32)
0000:02:0c.0 System peripheral: Toshiba America Info Systems TC6371AF SmartMedia
Controller (rev 03)
0000:02:0d.0 System peripheral: Toshiba America Info Systems SD TypA Controller
(rev 03)

Software Environment:
i686-pc-linux-gnu-3.4.3-20050110

Problem Description:
/proc/acpi/toshiba is missing in 2.6.12-rc, it worked in 2.6.11