This issue is present with kernel 2.6.29 (http://kernel.ubuntu.com
/~kernel-ppa/mainline/v2.6.29/).

[ 1368.344399] iwlagn: Read index for DMA queue txq_id (2) index 134 is out of 
range [0-256] 148 145
[ 1368.344407] iwlagn: Read index for DMA queue txq id (4), index 237, is out 
of range [0-256] 244 242.
[ 1372.836035] wlan2: No ProbeResp from current AP 00:21:91:ea:90:1f - assume 
out of range
[ 1373.436105] iwlagn: Error sending REPLY_SCAN_CMD: time out after 500ms.
[ 1373.936061] iwlagn: Error sending REPLY_RXON: time out after 500ms.
[ 1373.936070] iwlagn: Error setting new RXON (-110)
[ 1373.936079] wlan2: direct probe to AP 00:21:91:ea:90:1f try 1
[ 1374.136060] wlan2: direct probe to AP 00:21:91:ea:90:1f try 2
[ 1374.336066] wlan2: direct probe to AP 00:21:91:ea:90:1f try 3
[ 1374.536080] wlan2: direct probe to AP 00:21:91:ea:90:1f timed out
[ 1383.940081] iwlagn: Error sending REPLY_SCAN_CMD: time out after 500ms.
[ 1388.432093] iwlagn: Error sending REPLY_SCAN_CMD: time out after 500ms.
[ 1388.932086] iwlagn: Error sending REPLY_SCAN_CMD: time out after 500ms.
[ 1389.440061] iwlagn: Error sending REPLY_SCAN_CMD: time out after 500ms.
[ 1394.940055] iwlagn: Error sending REPLY_SCAN_CMD: time out after 500ms.
[ 1400.441265] iwlagn: Error sending REPLY_SCAN_CMD: time out after 500ms.
[ 1405.940115] iwlagn: Error sending REPLY_SCAN_CMD: time out after 500ms.
[ 1411.440089] iwlagn: Error sending REPLY_SCAN_CMD: time out after 500ms.
[ 1415.482414] iwlagn 0000:06:00.0: PCI INT A disabled
[ 1420.604118] cfg80211: Calling CRDA to update world regulatory domain
[ 1420.686594] cfg80211: World regulatory domain updated:
[ 1420.686602]  (start_freq - end_freq @ bandwidth), (max_antenna_gain, 
max_eirp)
[ 1420.686608]  (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 1420.686613]  (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 1420.686618]  (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[ 1420.686623]  (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 1420.686628]  (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[ 1420.705404] iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, 
1.3.27ks
[ 1420.705410] iwlagn: Copyright(c) 2003-2008 Intel Corporation
[ 1420.705595] iwlagn 0000:06:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[ 1420.705644] iwlagn 0000:06:00.0: setting latency timer to 64
[ 1420.706066] iwlagn: Detected Intel Wireless WiFi Link 5100AGN REV=0x54
[ 1420.728764] iwlagn: Tunable channels: 13 802.11bg, 24 802.11a channels
[ 1420.729206] wmaster0 (iwlagn): not using net_device_ops yet
[ 1420.731472] phy0: Selected rate control algorithm 'iwl-agn-rs'
[ 1420.731569] wlan0 (iwlagn): not using net_device_ops yet
[ 1420.790039] udev: renamed network interface wlan0 to wlan2
[ 1424.729422] iwlagn 0000:06:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[ 1424.729620] iwlagn 0000:06:00.0: irq 31 for MSI/MSI-X
[ 1424.729695] iwlagn 0000:06:00.0: firmware: requesting iwlwifi-5000-1.ucode
[ 1424.751159] iwlagn loaded firmware version 5.4.1.16
[ 1424.908431] Registered led device: iwl-phy0:radio
[ 1424.908853] Registered led device: iwl-phy0:assoc
[ 1424.918829] Registered led device: iwl-phy0:RX
[ 1424.918875] Registered led device: iwl-phy0:TX
[ 1424.940281] ADDRCONF(NETDEV_UP): wlan2: link is not ready
jar...@gandalf:~$ 

jar...@gandalf:~$ uname -a
Linux gandalf 2.6.29-020629-generic #020629 SMP Tue Mar 24 11:23:53 UTC 2009 
x86_64 GNU/Linux
jar...@gandalf:~$ 

I've had this happen with stock ubuntu 9.04 kernel (2.6.28-11-generic)
with stock radeon (xserver-xorg-video-radeon       1:6.12.1-0ubuntu1 )
and also with stock fglrx installed on the same kernel.



** Summary changed:

- radeon dri / dma conflitcs with wireless driver
+ iwlagn: Read index for DMA queue txq_id (2) index 134 is out of range [0-256] 
148 145. Wireless connection drops.

-- 
iwlagn: Read index for DMA queue txq_id (2) index 134 is out of range [0-256] 
148 145. Wireless connection drops.
https://bugs.launchpad.net/bugs/343987
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