On 02/23/2014 09:02 AM, Grumbach, Emmanuel wrote: >> >> On Sat, Feb 22, 2014 at 10:18 PM, Grumbach, Emmanuel >> <emmanuel.grumbach@xxxxxxxxx> wrote: >>>> >>>> (Resending as plain text) >>>> >>>> I have a strange issue with my Intel Wireless 7260 adapter on my Dell XPS >> 13 >>>> (Haswell). It seems that packets are received but aren't processed by the >>>> kernel or something until more packets are transmitted. The net effect is >>>> that the laptop's wireless seems somewhat choppy. I can demonstrate >> this >>>> by running something in a remote ssh session that generates periodic >>>> output, and that output doesn't appear until I generate more outgoing >>>> traffic. It's hard to describe it beyond that, but I took a screen capture >> which >>>> demonstrates this very well: >>>> http://www.youtube.com/watch?v=4RMURSMszmc >>>> >>>> lspci shows the wireless card as: 02:00.0 Network controller: Intel >> Corporation >>>> Wireless 7260 (rev 6b) uname -a: Linux dalek 3.11.0-12-generic #19- >> Ubuntu >>>> SMP Wed Oct 9 16:20:46UTC 2013 x86_64 x86_64 x86_64 GNU/Linux >>>> >>>> I googled this without success. I can gather diagnostic information if you >> send >>>> me instructions, I'm just not sure where to start or what to look for. Is this >> a >>>> bug in the driver? Maybe in the card microcode itself? Has anyone else >>>> reported this issue? It seems very strange. >>>> Any help is appreciated. >>> >>> Can you please send the output of dmesg? >>> Tracing output can help too - but let's start with dmesg output. >>> >> >> My full dmesg output is here: http://smkent.net/stuff/dmesg-dalek- >> 20140222 >> > > Your dmesg looks healthy > >> Here's some selected output. I'm not sure if it's useful. >> >> smkent@dalek Desktop $ grep -ie iwl -e 80211 dmesg-dalek-20140222 >> [ 3.968070] cfg80211: Calling CRDA to update world regulatory domain >> [ 3.976500] iwlwifi 0000:02:00.0: can't disable ASPM; OS doesn't >> have ASPM control >> [ 3.976585] iwlwifi 0000:02:00.0: irq 59 for MSI/MSI-X >> [ 4.115345] iwlwifi 0000:02:00.0: loaded firmware version 22.1.7.0 >> op_mode iwlmvm >> [ 4.157435] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band >> Wireless AC 7260, REV=0x144 >> [ 4.157523] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S >> [ 4.157691] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S >> [ 4.269377] cfg80211: World regulatory domain updated: >> [ 4.269383] cfg80211: (start_freq - end_freq @ bandwidth), >> (max_antenna_gain, max_eirp) >> [ 4.269387] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), >> (300 mBi, 2000 mBm) >> [ 4.269390] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), >> (300 mBi, 2000 mBm) >> [ 4.269393] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), >> (300 mBi, 2000 mBm) >> [ 4.269396] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), >> (300 mBi, 2000 mBm) >> [ 4.269399] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), >> (300 mBi, 2000 mBm) >> [ 4.379283] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs' >> [ 4.709497] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S >> [ 4.709671] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S >> [ 9676.817175] cfg80211: Calling CRDA to update world regulatory domain >> [ 9676.823809] cfg80211: World regulatory domain updated: >> [ 9676.823820] cfg80211: (start_freq - end_freq @ bandwidth), >> (max_antenna_gain, max_eirp) >> [ 9676.823827] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), >> (300 mBi, 2000 mBm) >> [ 9676.823834] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), >> (300 mBi, 2000 mBm) >> [ 9676.823840] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), >> (300 mBi, 2000 mBm) >> [ 9676.823846] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), >> (300 mBi, 2000 mBm) >> [ 9676.823851] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), >> (300 mBi, 2000 mBm) >> [ 9680.014722] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S >> [ 9680.014890] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S >> >> I haven't taken a kernel trace before but I'm happy to do so if you >> can point me toward some instructions. >> > > as root: > trace-cmd record -e iwlwifi -e iwlwifi_msg. > > Reproduce the bug while it's running. Stop with Ctrl+C when the bug reproduced. > This will produce a trace.dat file which you can compress and send over email. > Could you please try to reproduce with power save disabled? options iwlmvm power_scheme=1 Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
