Hi,

I gather I have the same problem.  I have an AMD64 Dell Dimension C521 which boots fine with 2.6.20-13-generic .  However, 2.6.20-14-generic hangs silently on boot.  I tried the ~bcollins kernel above which doesn't fix it.

On the vanilla 2.6.20-14-generic, if I remove the vga=, quiet and splash lines, the kernel hangs with the last few messages:

Dquot-cache hash tables. entries: 512  (order 0, 4096 bytes)
io scheduler noop registered
io scheduler anticipatory registered
io scheduler scheduler deadline registered
io schedulercfq registered (default)

If I add noapic and acpi=off, it hangs with 

uniform CD-ROM driver Revision 3.20.
(initramfs)

In both of these, there's often a pause earlier at a line something like "booting processor 1/2".

After just trying the kernel at http://people.ubuntu.com/~bcollins/kernels/feisty-release/linux-image-2.6.20-14-generic_2.6.20-14.23_amd64.deb
I'm almost sure if booted once, but then I've tried it repeatedly since and find I still cannot boot.  Choking at the same "io schedulercfq " point.

When using edgy, the 2.6.17 kernel needed to be told pci=routeirq to boot, though that doesn't seem to help here.  This option was not necessary in  2.6.20-13-generic.


gavinmc@boing:~$ lspci
00:00.0 RAM memory: nVidia Corporation C51 Host Bridge (rev a2)
00:00.1 RAM memory: nVidia Corporation C51 Memory Controller 0 (rev a2)
00:00.2 RAM memory: nVidia Corporation C51 Memory Controller 1 (rev a2)
00:00.3 RAM memory: nVidia Corporation C51 Memory Controller 5 (rev a2)
00:00.4 RAM memory: nVidia Corporation C51 Memory Controller 4 (rev a2)
00:00.5 RAM memory: nVidia Corporation C51 Host Bridge (rev a2)
00:00.6 RAM memory: nVidia Corporation C51 Memory Controller 3 (rev a2)
00:00.7 RAM memory: nVidia Corporation C51 Memory Controller 2 (rev a2)
00:02.0 PCI bridge: nVidia Corporation C51 PCI Express Bridge (rev a1)
00:03.0 PCI bridge: nVidia Corporation C51 PCI Express Bridge (rev a1)
00:04.0 PCI bridge: nVidia Corporation C51 PCI Express Bridge (rev a1)
00:09.0 RAM memory: nVidia Corporation MCP51 Host Bridge (rev a2)
00:0a.0 ISA bridge: nVidia Corporation MCP51 LPC Bridge (rev a3)
00:0a.1 SMBus: nVidia Corporation MCP51 SMBus (rev a3)
00:0a.2 RAM memory: nVidia Corporation MCP51 Memory Controller 0 (rev a3)
00:0b.0 USB Controller: nVidia Corporation MCP51 USB Controller (rev a3)
00:0b.1 USB Controller: nVidia Corporation MCP51 USB Controller (rev a3)
00:0e.0 IDE interface: nVidia Corporation MCP51 Serial ATA Controller (rev a1)
00:0f.0 IDE interface: nVidia Corporation MCP51 Serial ATA Controller (rev a1)
00:10.0 PCI bridge: nVidia Corporation MCP51 PCI Bridge (rev a2)
00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio (rev a2)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
03:00.0 VGA compatible controller: ATI Technologies Inc Unknown device 7183
03:00.1 Display controller: ATI Technologies Inc Unknown device 71a3
04:07.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)