2.5.51 - Strange UP APIC / 8139too / USB issues

Hi all.

I have a system with an Abit AT7 motherboard: VIA KT333, single Athlon, 512M RAM, onboard RTL8139 network, USB, USB2, 1394. *NO* onboard PS/2 keyboard or mouse ports.
Other: IDE HD, CD-RW, and DVD. Radeon 8500DV (will try getting that working later :)

I have used the system successfully with 2.4, and have been trying to get 2.5 to work. Until now, I haven't been able to get the USB keyboard to work. It is initialized by the BIOS, and is usable by GRUB for selecting boot images.

I finally found the culprit - "Local APIC Support on Uniprocessors" and "IO-APIC on uniprocessors". If both items are enabled, the network functions, but USB doesn't work. If not both are enabled (neither, or Local APIC but not IO-APIC), then the USB system works, but the network doesn't. :(

I am not using modules.

these are the only differences in .config:

multimedia linux-2.5.51 # diff -u working_network working_usbkeyboard_config3

@@ -63,9 +63,8 @@

# CONFIG_SMP is not set
# CONFIG_PREEMPT is not set
CONFIG_X86_UP_APIC=y
-CONFIG_X86_UP_IOAPIC=y
+# CONFIG_X86_UP_IOAPIC is not set
CONFIG_X86_LOCAL_APIC=y
-CONFIG_X86_IO_APIC=y
CONFIG_X86_MCE=y
CONFIG_X86_MCE_NONFATAL=y
# CONFIG_X86_MCE_P4THERMAL is not set

I can send complete configs, lspci / lsusb / whatever else anyone wants.

Thanks
- Steve

Correction:

The problem is actually ACPI. With ACPI disabled, both USB and network function correctly with local APIC + IO-APIC enabled or disabled.

Sorry for the red herring.

- Steve

Stephen Wille Padnos wrote:
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