Ater some years. I am figure out that on these machime was hardware deffect. 
Hardware is not stable.


>
>
>"IRQ problem dom0 xen4.5-amd64"
>i have mothrboard geforce 6100pm-m2(v3.0) latest bios and athtlon 64 x2 5000+ 
>cpu
>Mothrboard based on nforce 430 chipset
>if in bios enabled apic mode. Xen boot stops on trying to load dom0 kernel 
>(gentoo kernel v4.5 or ubuntu kernel v 4.2)  and just showing black screen, 
>but kernel without xen loads normally.
>
>if in bios disable apic mode Xen boot dom0 but not see any disk (of cource 
>scsi libata and nforce deivers enabled in kernel by "Y") and keyboard does not 
>work.
>logs on screen that i can see:
>genirq: flags mismatch irq12 00000080 (i8042) vs 00000000 (mce)
>genirq: flags mismatch irq1 00000080 (i8042) vs 0002cc00 (spinlock0)
>genirq: flags mismatch irq1 00000080 (rtc0) vs 0002cc00 (xen-pcpu)
>genirq: flags mismatch irq5 00000080 (sata_nv) vs 0002cc00 (callfunction0)
>
>

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