The connection to the wireless network often gets lost and then reconnects. Furthermore the connection to the wireless network is often very slow (1 Mb/s). Sometimes after I have reloaded the ath9k kernel module, I can get a connection to the network and sometimes not. Sometimes I have to reboot the pc, because I can't get a connection, but often I can't get a connection after that. wireless card: TP-Link TL-WN951N (AR5416 / AR5008 / 168c:0023) I tested the following mainline kernels.: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4-precise/ http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4.1-quantal/ http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4.6-quantal/ http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5-quantal/ http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6-rc1-quantal/ In those upstream kernel versions the bug is still present. I had this problem also with Ubuntu Oneiric Ocelot 11.10 and with Ubuntu Natty Narwhal 11.04, but with Natty the problem was not so bad because it was very rare. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.2.0-27-generic 3.2.0-27.43 ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21 Uname: Linux 3.2.0-27-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu11 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: buzz-dee 2462 F.... pulseaudio /dev/snd/controlC0: buzz-dee 2462 F.... pulseaudio Card0.Amixer.info: Card hw:0 'VT82xx'/'HDA VIA VT82xx at 0xfbffc000 irq 17' Mixer name : 'Realtek ALC660-VD' Components : 'HDA:10ec0660,1043c603,00100001' Controls : 36 Simple ctrls : 19 Card1.Amixer.info: Card hw:1 'SAA7134'/'saa7133[0] at 0xfbeef800 irq 18' Mixer name : 'SAA7134 Mixer' Components : '' Controls : 6 Simple ctrls : 3 CurrentDmesg: [ 51.480531] vboxdrv: fAsync=1 offMin=0x3600c offMax=0x3600c [ 51.480654] vboxdrv: TSC mode is 'asynchronous', kernel timer mode is 'normal'. [ 51.480656] vboxdrv: Successfully loaded version 4.1.12_Ubuntu (interface 0x00190000). [ 51.525894] vboxpci: IOMMU not found (not registered) [ 52.102129] init: plymouth-stop pre-start process (2156) terminated with status 1 Date: Fri Aug 3 22:12:57 2012 HibernationDevice: RESUME=UUID=7a9c200e-f813-4561-9c36-0d50f5e42f84 InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027) MachineType: System manufacturer M2V ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=de_DE.UTF-8 SHELL=/bin/zsh ProcFB: 0 nouveaufb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-27-generic root=UUID=837266ea-e282-4520-9b4d-8cf22d49c9cd ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.2.0-27-generic N/A linux-backports-modules-3.2.0-27-generic N/A linux-firmware 1.79 SourcePackage: linux UpgradeStatus: Upgraded to precise on 2012-06-10 (54 days ago) dmi.bios.date: 02/21/2008 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 2101 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: M2V dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2101:bd02/21/2008:svnSystemmanufacturer:pnM2V:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2V:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: M2V dmi.product.version: System Version dmi.sys.vendor: System manufacturer natty, oneiric, precise, kernel-wifi, modules, ath9k, amd64, networking, kernel, wireless ~$ cat /proc/version Linux version 3.6.0-030600rc1-generic (apw@gomeisa) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #201208022056 SMP Fri Aug 3 00:57:36 UTC 2012 ~$ lsb_release -rd Description: Ubuntu 12.04 LTS Release: 12.04 /usr/src/linux-headers-3.6.0-030600rc1/scripts$ sh ver_linux If some fields are empty or look unusual you may have an old version. Compare to the current minimal requirements in Documentation/Changes. Linux buzz-dee-desktop 3.6.0-030600rc1-generic #201208022056 SMP Fri Aug 3 00:57:36 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Gnu C 4.6 Gnu make 3.81 binutils 2.22 util-linux 2.20.1 mount support module-init-tools 3.16 e2fsprogs 1.42 reiserfsprogs 3.6.21 pcmciautils 018 Linux C Library 2.15 Dynamic linker (ldd) 2.15 Procps 3.2.8 Net-tools 1.60 Kbd 1.15.2 Sh-utils 8.13 wireless-tools 30 Modules Loaded rfcomm bnep binfmt_misc dm_crypt snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event ppdev arc4 snd_seq snd_timer snd_seq_device btusb hid_generic ath9k bluetooth snd kvm_amd kvm mac80211 ath9k_common ath9k_hw amd64_edac_mod soundcore dm_multipath edac_core snd_page_alloc scsi_dh ath edac_mce_amd cfg80211 psmouse serio_raw asus_atk0110 i2c_viapro max6650 parport_pc mac_hid hwmon_vid shpchp k8temp lp parport dm_mirror dm_region_hash dm_log usbhid hid nouveau pata_marvell ttm drm_kms_helper drm i2c_algo_bit mxm_wmi video wmi atl1 floppy usb_storage ~$ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 75 model name : AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ stepping : 2 microcode : 0x62 cpu MHz : 1000.000 cache size : 512 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good nopl extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy bogomips : 1999.81 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp tm stc processor : 1 vendor_id : AuthenticAMD cpu family : 15 model : 75 model name : AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ stepping : 2 microcode : 0x62 cpu MHz : 1000.000 cache size : 512 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good nopl extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy bogomips : 1999.81 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp tm stc ~$ cat /proc/modules rfcomm 47922 0 - Live 0x0000000000000000 bnep 18315 2 - Live 0x0000000000000000 binfmt_misc 17540 1 - Live 0x0000000000000000 dm_crypt 23120 0 - Live 0x0000000000000000 snd_hda_codec_realtek 79668 1 - Live 0x0000000000000000 snd_hda_intel 34147 3 - Live 0x0000000000000000 snd_hda_codec 135376 2 snd_hda_codec_realtek,snd_hda_intel, Live 0x0000000000000000 snd_hwdep 13668 1 snd_hda_codec, Live 0x0000000000000000 snd_pcm 97661 2 snd_hda_intel,snd_hda_codec, Live 0x0000000000000000 snd_seq_midi 13324 0 - Live 0x0000000000000000 snd_rawmidi 30749 1 snd_seq_midi, Live 0x0000000000000000 snd_seq_midi_event 14899 1 snd_seq_midi, Live 0x0000000000000000 ppdev 17113 0 - Live 0x0000000000000000 arc4 12573 2 - Live 0x0000000000000000 snd_seq 61897 2 snd_seq_midi,snd_seq_midi_event, Live 0x0000000000000000 snd_timer 29989 2 snd_pcm,snd_seq, Live 0x0000000000000000 snd_seq_device 14497 3 snd_seq_midi,snd_rawmidi,snd_seq, Live 0x0000000000000000 btusb 18291 0 - Live 0x0000000000000000 hid_generic 12493 0 - Live 0x0000000000000000 ath9k 147330 0 - Live 0x0000000000000000 bluetooth 218450 14 rfcomm,bnep,btusb, Live 0x0000000000000000 snd 79391 15 snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device, Live 0x0000000000000000 kvm_amd 56135 0 - Live 0x0000000000000000 kvm 437453 1 kvm_amd, Live 0x0000000000000000 mac80211 564667 1 ath9k, Live 0x0000000000000000 ath9k_common 14053 1 ath9k, Live 0x0000000000000000 ath9k_hw 399588 2 ath9k,ath9k_common, Live 0x0000000000000000 amd64_edac_mod 24584 0 - Live 0x0000000000000000 soundcore 15091 1 snd, Live 0x0000000000000000 dm_multipath 23260 0 - Live 0x0000000000000000 edac_core 62764 2 amd64_edac_mod, Live 0x0000000000000000 snd_page_alloc 18572 2 snd_hda_intel,snd_pcm, Live 0x0000000000000000 scsi_dh 14791 1 dm_multipath, Live 0x0000000000000000 ath 24123 3 ath9k,ath9k_common,ath9k_hw, Live 0x0000000000000000 edac_mce_amd 23547 1 amd64_edac_mod, Live 0x0000000000000000 cfg80211 212876 3 ath9k,mac80211,ath, Live 0x0000000000000000 psmouse 92362 0 - Live 0x0000000000000000 serio_raw 13215 0 - Live 0x0000000000000000 asus_atk0110 18078 0 - Live 0x0000000000000000 i2c_viapro 13153 0 - Live 0x0000000000000000 max6650 14328 0 - Live 0x0000000000000000 parport_pc 32866 1 - Live 0x0000000000000000 mac_hid 13253 0 - Live 0x0000000000000000 hwmon_vid 12827 0 - Live 0x0000000000000000 shpchp 37277 0 - Live 0x0000000000000000 k8temp 13064 0 - Live 0x0000000000000000 lp 17799 0 - Live 0x0000000000000000 parport 46562 3 ppdev,parport_pc,lp, Live 0x0000000000000000 dm_mirror 22203 0 - Live 0x0000000000000000 dm_region_hash 20918 1 dm_mirror, Live 0x0000000000000000 dm_log 18527 2 dm_mirror,dm_region_hash, Live 0x0000000000000000 usbhid 47307 0 - Live 0x0000000000000000 hid 100579 2 hid_generic,usbhid, Live 0x0000000000000000 nouveau 923628 3 - Live 0x0000000000000000 pata_marvell 12923 0 - Live 0x0000000000000000 ttm 88492 1 nouveau, Live 0x0000000000000000 drm_kms_helper 46931 1 nouveau, Live 0x0000000000000000 drm 277108 5 nouveau,ttm,drm_kms_helper, Live 0x0000000000000000 i2c_algo_bit 13564 1 nouveau, Live 0x0000000000000000 mxm_wmi 12979 1 nouveau, Live 0x0000000000000000 video 19412 1 nouveau, Live 0x0000000000000000 wmi 19256 2 nouveau,mxm_wmi, Live 0x0000000000000000 atl1 45310 0 - Live 0x0000000000000000 floppy 70244 0 - Live 0x0000000000000000 usb_storage 49287 0 - Live 0x0000000000000000 ~$ cat /proc/ioports 0000-0cf7 : PCI Bus 0000:00 0000-001f : dma1 0020-0021 : pic1 0040-0043 : timer0 0050-0053 : timer1 0060-0060 : keyboard 0064-0064 : keyboard 0070-0071 : rtc0 0080-008f : dma page reg 00a0-00a1 : pic2 00c0-00df : dma2 00f0-00ff : fpu 0170-0177 : 0000:00:0f.1 0170-0177 : pata_acpi 01f0-01f7 : 0000:00:0f.1 01f0-01f7 : pata_acpi 0376-0376 : 0000:00:0f.1 0376-0376 : pata_acpi 0378-037a : parport0 037b-037f : parport0 03e0-03e7 : pnp 00:08 03f2-03f2 : floppy 03f4-03f5 : floppy 03f6-03f6 : 0000:00:0f.1 03f6-03f6 : pata_acpi 03f7-03f7 : floppy 03f8-03ff : serial 0400-041f : pnp 00:08 0400-0407 : vt596_smbus 04d0-04d1 : pnp 00:08 0800-087f : pnp 00:08 0800-0803 : ACPI PM1a_EVT_BLK 0804-0805 : ACPI PM1a_CNT_BLK 0808-080b : ACPI PM_TMR 0810-0815 : ACPI CPU throttle 0820-0823 : ACPI GPE0_BLK 0a20-0a2f : pnp 00:06 0a30-0a3f : pnp 00:06 0c00-0c0f : pnp 00:06 0cf8-0cff : PCI conf1 0d00-ffff : PCI Bus 0000:00 0d00-0d0f : pnp 00:06 1000-1fff : PCI Bus 0000:05 2000-2fff : PCI Bus 0000:04 3000-3fff : PCI Bus 0000:03 b480-b49f : 0000:00:10.0 b480-b49f : uhci_hcd b800-b81f : 0000:00:10.1 b800-b81f : uhci_hcd b880-b89f : 0000:00:10.2 b880-b89f : uhci_hcd bc00-bc1f : 0000:00:10.3 bc00-bc1f : uhci_hcd c000-c0ff : 0000:00:0f.0 c400-c40f : 0000:00:0f.0 c400-c40f : pata_acpi c480-c483 : 0000:00:0f.0 c480-c483 : pata_acpi c800-c807 : 0000:00:0f.0 c800-c807 : pata_acpi c880-c883 : 0000:00:0f.0 c880-c883 : pata_acpi cc00-cc07 : 0000:00:0f.0 cc00-cc07 : pata_acpi d000-dfff : PCI Bus 0000:02 dc00-dc7f : 0000:02:00.0 e000-efff : PCI Bus 0000:06 e400-e40f : 0000:06:00.0 e400-e40f : pata_marvell e480-e483 : 0000:06:00.0 e480-e483 : pata_marvell e800-e807 : 0000:06:00.0 e800-e807 : pata_marvell e880-e883 : 0000:06:00.0 e880-e883 : pata_marvell ec00-ec07 : 0000:06:00.0 ec00-ec07 : pata_marvell fc00-fc0f : 0000:00:0f.1 fc00-fc0f : pata_acpi ~$ cat /proc/iomem 00000000-0000ffff : reserved 00010000-0009dbff : System RAM 0009dc00-0009ffff : reserved 000a0000-000bffff : PCI Bus 0000:00 000c0000-000ce1ff : Video ROM 000d0000-000dffff : PCI Bus 0000:00 000e4000-000fffff : reserved 000f0000-000fffff : System ROM 00100000-cffaffff : System RAM 01000000-016a876a : Kernel code 016a876b-01cdfe7f : Kernel data 01dd5000-01f2ffff : Kernel bss cffb0000-cffbdfff : ACPI Tables cffbe000-cffdffff : ACPI Non-volatile Storage cffe0000-cfffffff : reserved d0000000-ff37ffff : PCI Bus 0000:00 d0000000-dfffffff : PCI Bus 0000:02 d0000000-dfffffff : 0000:02:00.0 e0000000-efffffff : PCI MMCONFIG 0000 [bus 00-ff] e0000000-efffffff : pnp 00:0f f0000000-f01fffff : PCI Bus 0000:06 f0200000-f05fffff : PCI Bus 0000:05 f0600000-f07fffff : PCI Bus 0000:04 f0800000-f0bfffff : PCI Bus 0000:03 f6e00000-f6efffff : PCI Bus 0000:03 f6f00000-f6ffffff : PCI Bus 0000:05 f7fffc00-f7fffcff : 0000:00:10.4 f7fffc00-f7fffcff : ehci_hcd f8000000-fbbfffff : PCI Bus 0000:02 f8000000-f9ffffff : 0000:02:00.0 fa000000-faffffff : 0000:02:00.0 fbbe0000-fbbfffff : 0000:02:00.0 fbc00000-fbcfffff : PCI Bus 0000:04 fbca0000-fbcbffff : 0000:04:00.0 fbcc0000-fbcfffff : 0000:04:00.0 fbcc0000-fbcfffff : atl1 fbd00000-fbdfffff : PCI Bus 0000:06 fbdffc00-fbdfffff : 0000:06:00.0 fbe00000-fbefffff : PCI Bus 0000:07 fbeef800-fbeeffff : 0000:07:08.0 fbef0000-fbefffff : 0000:07:07.0 fbef0000-fbefffff : ath9k fbf00000-fbffffff : PCI Bus 0000:80 fbffc000-fbffffff : 0000:80:01.0 fbffc000-fbffffff : ICH HD audio fec00000-fec00fff : reserved fec00000-fec003ff : IOAPIC 0 fecc0000-fecc0fff : reserved fecc0000-fecc03ff : IOAPIC 1 fed00000-fed003ff : HPET 0 fee00000-fee00fff : Local APIC fee00000-fee00fff : pnp 00:0b ff780000-ffffffff : reserved 100000000-1afffffff : System RAM ~$ cat /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: ST3500418AS Rev: CC34 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: WDC WD6400AAKS-2 Rev: 01.0 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi3 Channel: 00 Id: 00 Lun: 00 Vendor: TSSTcorp Model: CD/DVDW TS-H552U Rev: US08 Type: CD-ROM ANSI SCSI revision: 05 Host: scsi3 Channel: 00 Id: 01 Lun: 00 Vendor: Optiarc Model: DVD RW AD-7173A Rev: 1-01 Type: CD-ROM ANSI SCSI revision: 05 ~$ ls /proc/ 1 1319 1723 2445 2678 2996 405 cmdline mounts 10 13253 1755 2449 2679 2999 406 consoles mtrr 100 13265 1758 2451 2692 3 407 cpuinfo net 1006 13266 1772 2460 2694 30 43 crypto pagetypeinfo 10566 1328 1784 2468 27 3002 4676 devices partitions 1057 13280 1799 2474 2708 3006 5 diskstats sched_debug 1106 1330 18 2484 2711 3007 574 dma schedstat 1107 1338 1806 2487 2712 3008 6585 dri scsi 1170 1345 1823 2489 2715 3009 7 driver self 11749 1347 19 2491 2716 3011 700 execdomains slabinfo 1176 1363 1947 2492 2761 31 703 fb softirqs 12 1381 1948 2493 2775 3115 8 filesystems stat 120 1384 1963 2494 2780 3116 8277 fs swaps 121 1388 2 2495 28 3154 8320 interrupts sys 122 1397 20 2497 2809 3160 85 iomem sysrq-trigger 1229 14 21 2499 2812 3177 86 ioports sysvipc 12514 1405 2174 25 2820 3178 89 irq timer_list 12553 15 2175 2501 2826 318 9 kallsyms timer_stats 1258 1551 22 2510 2832 3187 90 kcore tty 126 16 2280 2519 2844 319 906 key-users uptime 1289 1620 23 2521 2845 3191 917 kmsg version 12926 1625 2300 2523 2852 32 947 kpagecount vmallocinfo 12927 1644 2331 2526 2860 3231 95 kpageflags vmstat 13 1650 2345 2528 2867 3248 971 latency_stats zoneinfo 13003 1659 2379 2533 2874 33 972 loadavg 13026 1686 2390 2597 2875 3325 acpi locks 13042 1688 24 2628 2883 337 asound mdstat 13043 1691 2440 2630 29 34 buddyinfo meminfo 1307 17 2441 2638 2931 3955 bus misc 1318 1704 2444 2672 2975 4035 cgroups modules