Additional info: It seems that this problem also occurs at the previous Ubuntu version (6.10 CD) and latest Debian. Don't know why it didn't bother me before...
Further I saw on the internet that Nvidia did have some problems (I've an Epox 8RDA+ motherboard with Nvidia/nforce chipset) with usb. It should possible be related to acpi, or apic. Switched both off in kernel and bios. It didn't help.
Also I 've seen some notes about timer problems (may be related, the clock is very inaccurate) in the kernel and irq's. I don't know how to check that, and if the Ubuntu kernel is patched for nvidia.
Additional info: It seems that this problem also occurs at the previous Ubuntu version (6.10 CD) and latest Debian. Don't know why it didn't bother me before...
Further I saw on the internet that Nvidia did have some problems (I've an Epox 8RDA+ motherboard with Nvidia/nforce chipset) with usb. It should possible be related to acpi, or apic. Switched both off in kernel and bios. It didn't help.
Also I 've seen some notes about timer problems (may be related, the clock is very inaccurate) in the kernel and irq's. I don't know how to check that, and if the Ubuntu kernel is patched for nvidia.