> > 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. Thanks! > Thanks, > > Stephen ��.n��������+%������w��{.n�����{���zW����ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
