The problems go away when I switch back to 2.6.31-21-server, so it's not an hardware issue.
Only discs which are controlled by the nVidia MCP55 seems to be affected (PATA & SATA):
*-ide:0
description: IDE interface
product: MCP55 IDE
vendor: nVidia Corporation
*-disk description: ATA Disk
vendor: Western Digital
*-ide:1
description: IDE interface
product: MCP55 SATA Controller
vendor: nVidia Corporation
*-disk:0 description: ATA Disk
vendor: Western Digital
*-disk:1 description: ATA Disk
vendor: Western Digital
*-ide:2
description: IDE interface
product: MCP55 SATA Controller
vendor: nVidia Corporation
*-disk:0 description: ATA Disk
vendor: Western Digital
*-disk:1 description: ATA Disk
vendor: Western Digital
*-ide:3
description: IDE interface
product: MCP55 SATA Controller
vendor: nVidia Corporation
*-disk:0 description: ATA Disk
vendor: Western Digital
*-disk:1 description: ATA Disk
vendor: Western Digital
The problems go away when I switch back to 2.6.31-21-server, so it's not an hardware issue.
Only discs which are controlled by the nVidia MCP55 seems to be affected (PATA & SATA):
*-ide:0
description: ATA Disk
description: ATA Disk
description: ATA Disk
description: ATA Disk
description: ATA Disk
description: ATA Disk
description: ATA Disk
description: IDE interface
product: MCP55 IDE
vendor: nVidia Corporation
*-disk
vendor: Western Digital
*-ide:1
description: IDE interface
product: MCP55 SATA Controller
vendor: nVidia Corporation
*-disk:0
vendor: Western Digital
*-disk:1
vendor: Western Digital
*-ide:2
description: IDE interface
product: MCP55 SATA Controller
vendor: nVidia Corporation
*-disk:0
vendor: Western Digital
*-disk:1
vendor: Western Digital
*-ide:3
description: IDE interface
product: MCP55 SATA Controller
vendor: nVidia Corporation
*-disk:0
vendor: Western Digital
*-disk:1
vendor: Western Digital