Solaris9 x86 problem with network cards, ACPI, IRQs

Hello!
For the last two days I've been trying to solve the problem of Solaris9 x86 not being able to use my network card. I have tried with 3c905CX-TX-M, RealTek 8139 and Realtek 8029 and none of them works. The problem is the following:
Everything is properly configured, networking etc., but the cards can only send and cannot receive packets. When trying to ping, the packets leave the NIC but none of the reponses are detected by NIC. When I check with 'kstat elxl' I can see that 'intr' is zero, and out_packets is increasing as it's sending packets.
From the discussion forum I can see that this same problem has been known for several years. One of the conclusions is that Solaris x86 sucks at dealing with IRQ setup and that the best thing is to disable ACPI and 'PnP OS' option in BIOS. However, I've tried all releases of AMI bios and none them has neither of those options. I have played with various priority levels in BIOS but all that has accomplished is that the card, when first started, captures a few interrupts/packets but then stops again. This is usually just enough to finish the ARP exchange (arp -a shows the remote host).
And of course, all the cards work just fine in WindowsXP and Linux. And all the cards work nice in another PC which runs the same Solaris 9 x86.
My motherboard is Gigabyte 7VTXE. (The other one in which it works is ASUS P2B-DS).
I would really appreciate help!
Josip

I had almost identical problem today on an HP Kayak - which happened to be dual CPU one. The fix
set pcplusmp:apic_forceload = -1
in /etc/system worked for me. The only drawback is that it also leaves the machine single CPU. AFAIK this (downloadable) S9x86 kit is licensed only for one CPU anyway, so I wonder if something has been fixed in the code to make sure it is not run on multi-CPU systems. Before the fix, mpstat showed thousands of interrupts on CPU0, both CPUs were constantly busy at about 70% and there was no network connection on a number of cards I tried (3Com 90x - elxl, Intel iprb, another one with Realtek 8139 was never recognized, so I did not bother too much to find if there is a fix for this); pinging out resulted in the hub port light blinking, nothing comes back.
Anyway, the fix is good enough to test s9 for now; everything else seemed to be OK. If it may be of some use for somebody, don't go into the disk option of the Solaris Management Console; the machine in question had Windows 2003 server (RC2) installed before Solaris9, the disk tool decided that there was no label on the disk and asked to write it on; I clicked the 'cancel' button, but the partition table was irreversibly damaged, so I had to start from installing W2k3. My guess is that tool has been tested only with Sparc, so there is no issue with BIOS level partitioning there. BTW, system info of the SMC insists that the CPUs are Sparcs...

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