Hi,

I have a problem on a special POS mainboard that has
a Realtek RTL8111/8168/8411 chip. I use mainline kernel 4.0.5.

The initial problem was that when r8169 was not blacklisted,
as soon as this driver loaded, a lot of IRQ problems popped up,
like pressing keys on the USB keyboard made the keys duplicated
and the system was sluggish. Upon powering off the system,
the r8169 driver compained about "rtl_eriar_cond = 1 loop 100"
or something like that and the system couldn't even reboot or
get powered down properly.

It was impossible to get dmesg or other diagnostics info out of
the system in this state.

When I blacklisted r8169, everything was OK except there was
no network, obviously.

I also noticed that with kernel 4.0.5, there are memory range conflicts, like

pci 0000:00:02.0: can't claim BAR 0 [mem ....]: address conflict with PCI Bus 0000:00 [mem
... window]

I also tried to load the r8168 driver from Realtek, with the
same results as with r8169.

I don't know what happened, was it the "official" Realtek driver
that disabled the chip, or that I toggled the PXE boot in the BIOS,
but now lspci doesn't list the ethernet chip anymore and not even
the PXE boot messages show up, despite it being enabled in the BIOS.
I tried kernels 3.18.16, 4.0.5 again and 4.1.0-rc8.

I have this in dmesg:

[    0.136171] ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 *7 10 11 12 14 15)
[    0.136323] ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 10 11 12 *14 15)
[    0.136466] ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 7 10 11 12 14 *15)
[    0.136609] ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 10 11 12 14 *15)
[    0.136751] ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 7 10 11 12 14 15) *0, disabled.
[    0.136894] ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 7 10 11 12 14 15) *0, disabled.
[    0.137050] ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 6 7 10 11 12 14 15) *0, disabled.
[    0.137195] ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 *6 7 10 11 12 14 15)

and

[    0.139098] PCI: Using ACPI for IRQ routing
[    0.139098] PCI: pci_cache_line_size set to 64 bytes
[    0.139098] pci 0000:00:02.0: can't claim BAR 0 [mem 0xfeb00000-0xfeb7ffff]: address
conflict with PCI Bus 0000:00 [mem 0xf0000000-0xfed8ffff window]
[    0.139098] pci 0000:00:02.0: can't claim BAR 2 [mem 0xd0000000-0xdfffffff pref]:
address conflict with PCI Bus 0000:00 [mem 0x7f700000-0xdfffffff window]
[    0.139104] pci 0000:00:02.0: can't claim BAR 3 [mem 0xfea00000-0xfeafffff]: address
conflict with PCI Bus 0000:00 [mem 0xf0000000-0xfed8ffff window]
[    0.139113] pci 0000:00:02.1: can't claim BAR 0 [mem 0xfeb80000-0xfebfffff]: address
conflict with PCI Bus 0000:00 [mem 0xf0000000-0xfed8ffff window]
[    0.139123] pci 0000:00:1b.0: can't claim BAR 0 [mem 0xfe9f8000-0xfe9fbfff 64bit]:
address conflict with PCI Bus 0000:00 [mem 0xf0000000-0xfed8ffff window]
[    0.139146] pci 0000:00:1d.7: can't claim BAR 0 [mem 0xfe9f7c00-0xfe9f7fff]: address
conflict with PCI Bus 0000:00 [mem 0xf0000000-0xfed8ffff window]
[    0.139161] pci 0000:00:1f.2: can't claim BAR 5 [mem 0xfe9f7800-0xfe9f7bff]: address
conflict with PCI Bus 0000:00 [mem 0xf0000000-0xfed8ffff window]
[    0.139190] Expanded resource reserved due to conflict with PCI Bus 0000:00

Full dmesg for 4.0.5 is attached.

Can anyone help me re-enable the network card?

Thanks in advance,
Zoltán Böszörményi