Laptop is a Sony Vaio Z VPCZ12CGX.
i had the problem a few versions ago where 802.11n was disabled but I thought that was all over with. I'm connected to my access point at 216Mb/s. However when I run iperf to a server on the other side of the network wired via gigabit I only get about 25Mbit. When I do a test from that same box back to my laptop I get about 50Mbit. When doing a test from another laptop on the same wireless network to the same box things run around 85-90Mbit this box has an Intel 5100 card. Ranges to the access point is about the same on both machines. I've tried changing channels and its the only 5Ghz AP in the area. AP is a WNDR3700. Using latest 14.04 but I had these exact same issues on 13.10 and was hoping that a format and fresh install would help. No such luck. I've verified that I've got the latest driver from (http://wireless.kernel.org/en/users/Drivers/iwlwifi) and have tried loading the version from there into my firmware folder. No change there either.
Code:brett@lappy:~$ iwconfig eth0 no wireless extensions. lo no wireless extensions. wlan0 IEEE 802.11abgn ESSID:"howard5g" Mode:Managed Frequency:5.785 GHz Access Point: 00:24:B2:5A:8B:56 Bit Rate=216 Mb/s Tx-Power=15 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:on Link Quality=55/70 Signal level=-55 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:337 Missed beacon:0Code:brett@lappy:~$ lspci | grep Network 00:19.0 Ethernet controller: Intel Corporation 82577LC Gigabit Network Connection (rev 05) 02:00.0 Network controller: Intel Corporation Centrino Advanced-N 6200 (rev 35)Code:brett@lappy:~$ dmesg | grep iwl [ 4.202205] iwlwifi 0000:02:00.0: can't disable ASPM; OS doesn't have ASPM control [ 4.202271] iwlwifi 0000:02:00.0: irq 43 for MSI/MSI-X [ 4.204575] iwlwifi 0000:02:00.0: Direct firmware load failed with error -2 [ 4.204580] iwlwifi 0000:02:00.0: Falling back to user helper [ 4.586250] iwlwifi 0000:02:00.0: Direct firmware load failed with error -2 [ 4.586252] iwlwifi 0000:02:00.0: Falling back to user helper [ 4.604828] iwlwifi 0000:02:00.0: loaded firmware version 9.221.4.1 build 25532 op_mode iwldvm [ 4.636542] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEBUG disabled [ 4.636544] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEBUGFS enabled [ 4.636545] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled [ 4.636547] iwlwifi 0000:02:00.0: Detected Intel(R) Centrino(R) Advanced-N 6200 AGN, REV=0x74 [ 4.636602] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S [ 4.657639] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs' [ 5.668494] Modules linked in: joydev arc4 iwldvm mac80211 mxm_wmi intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel snd_hda_intel(+) aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_hda_codec snd_hwdep snd_pcm rfcomm dm_multipath bnep scsi_dh psmouse snd_page_alloc serio_raw snd_seq_midi snd_seq_midi_event snd_rawmidi uvcvideo iwlwifi btusb videobuf2_vmalloc videobuf2_memops videobuf2_core bluetooth intel_ips(+) videodev snd_seq mac_hid snd_seq_device i915(+) snd_timer snd sony_laptop cfg80211 drm_kms_helper drm wmi video i2c_algo_bit soundcore mei_me mei lpc_ich binfmt_misc lp parport ahci libahci sdhci_pci sdhci dm_mirror dm_region_hash dm_log e1000e ptp pps_core [ 6.878377] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S [ 6.885047] iwlwifi 0000:02:00.0: Radio type=0x1-0x3-0x1 [ 7.096813] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S [ 7.103702] iwlwifi 0000:02:00.0: Radio type=0x1-0x3-0x1
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