I recently got my fit-PC3 with usb face module and G-T40E processor.

I have installed a standard Ubuntu 11.10 with kernel 3.0.0-15 (x86_64) and I am trying to use it as wireless access point using hostapd.

It works nicely for a while - maybe one or two hours, but then starts failing with the following kernel messages:

DMA: Out of SW-IOMMU space for 148 bytes at device 0000:05:00.0

When this occurs a hard reset is necessary.

The device id indicates that the problems is related to the Realtek Wifi adaptor. The command "lshw -c Network" produces:

resources: irq:43 ioport:2000(size=256) memory:c0004000-c0004fff memory:c0000000-c0003fff memory:c0010000-c001ffff
*-network
description: Wireless interface
product: RTL8188CE 802.11b/g/n WiFi Adapter
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:05:00.0
logical name: wlan0
version: 01
serial: 74:2f:68:f2:13:4f
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtl8192ce driverversion=3.0.0-15-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn

The problem is the same both with the default driver that comes from ubuntu and when I try the driver that can be downloaded from the Realtek website:

http://www.realtek.com.tw/downloads/dow ... #RTL8188CE

I am downloading the RTL8188 Driver: 92ce_se_de_linux_mac80211_0005.1230.2011.tar.gz

I have now resolved back to deactivating the built-in wifi adaptor and using an external usb wifi adaptor. Then things run perfectly, but that of course was not the intention.

Based on what I have seen in various driver discussions I have tried the kernel options "mem=4G iommu=off" but that makes no difference.

Any clues on how to solve this issue which is actually making the built-in wifi adaptor useless.

Thanks for the report. We will try to reproduce the problem and then identify the source. The Realtek WiFi adapter is perfectly stable in NIC mode. It may be helpful if you test it for a few hours in NIC mode to rule out a HW problem with the WiFi adapter.

Hi,

this thread is some days old now and there has been no solution posted yet. I also have the issue of my fit-pc3 being always on and the wifi connection beeing not available after some time.

I use both, wired connection (wan) and wifi connection (lan) with a dual lan configuration. After some hours uptime the wireless connection drops (as posted in the first post of this thread).

Any solution on that, as it is really annoying for an always-on system?

Thanks & regards

We are trying to reproduce this problem using different setups, and we will update this post with the results. Till now, we were unable to reproduce this bug with stock Linux Mint setup

Hi,

I've had the same issues using the same setup. It is apparently a problem with the driver for the realtek card.

The bug (or at least a very related one) was discussed recently on the ubuntu bugtracker: https://bugs.launchpad.net/ubuntu/+sour ... bug/961618

The associated kernel bug can be found here:
https://bugzilla.kernel.org/show_bug.cgi?id=42976

The associated patch is merged into Linux v3.4-rc3

My hostapd access point did however not work at all, after using the new kernel. So thus far I still do not have a working setup.

Best regards,
// Troels

I can confirm this bug with Ubuntu 12.04 (kernel 3.2.0-23), it's really pretty unfortunate because I'd like to use the fit-pc3 as mediaserver _and_ router.
Hopefully the kernel-patch will fix the issue.

Hi,

I am experiencing the same problem for a few months now (Debian kernel 3.3.3). I burned way too many hours trying to find a solution.

Is there any progress by anyone of you?