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[Paulo Andres Jara Santibanez <1454717@xxxxxxxxxxxxxxxxxx>]

OK, i tried this fix on HP240 G4 running Ubuntu 14.04,  the fix in some way helps because before do it the wifi doesn't worked at all.
After this fix, all goes so much better but still have some problems: very low-signal, randomly it's hard to connect to router D-link, Linksys and others, and when it finally gets connected, after arround 15min it's drops the connection and start to try re-connect once again.
Finally, do not connects to my ad-doc net from my other laptop (Ubuntu 12.04.5) 


ZeroShujin (jfernandohr0409) wrote on 2015-10-29: 	#9

Had the same problem several months on my Lenovo G500 with BCM43142
looking for solutions but nothing. This week read a solution on another
thread (https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1405074),
gave it a try and it worked.

I downloaded the binaries for 6.30.223.271 (from
http://www.broadcom.com/support/802.11), uninstalled my current driver,
installed the new one (follow the readme
https://www.broadcom.com/docs/linux_sta/README.txt) and it stopped the
unstable wifi and disconnections. I hope it will continue like this, 3
days have passed and everything is still okay.

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https://bugs.launchpad.net/bugs/1454717

Title:
  Weak wifi signal and frequency disconnects

Status in bcmwl package in Ubuntu:
  Confirmed

Bug description:
  This bug duplicate
  https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1379524 but it
  marked expired.

  Symptoms same - on my notebook HP Pavilion p170nr with BCM43142 chip
  has very low and unstable wi-fi signal. I even can't work from far
  room because of permanent disconnects and very low speed. Windows 8 in
  same place work fine also all phones.

  Also connection frequency disappear. Disconnects don't depend on
  signal level. Connection may break even near router and hi (relative)
  signal. I changed router but this didn't help.

  I don't know if it help, but I get this message in dmesg log

  [29218.308151] ------------[ cut here ]------------
  [29218.308177] WARNING: CPU: 2 PID: 524 at /build/buildd/linux-3.19.0/net/wireless/sme.c:800 cfg80211_roamed+0x91/0xa0 [cfg80211]()
  [29218.308179] Modules linked in: rfcomm bnep binfmt_misc bbswitch(OE) nls_iso8859_1 intel_rapl iosf_mbi hp_wmi sparse_keymap x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic wl(POE) snd_hda_intel snd_hda_controller coretemp kvm_intel snd_hda_codec snd_hwdep btusb kvm snd_pcm uvcvideo crct10dif_pclmul snd_seq_midi snd_seq_midi_event bluetooth snd_rawmidi crc32_pclmul videobuf2_vmalloc snd_seq videobuf2_memops videobuf2_core ghash_clmulni_intel v4l2_common aesni_intel videodev media aes_x86_64 lrw gf128mul glue_helper snd_seq_device ablk_helper snd_timer dm_multipath cryptd scsi_dh i915 snd cfg80211 soundcore hp_accel joydev serio_raw lis3lv02d input_polldev shpchp drm_kms_helper hp_wireless mei_me wmi drm video i2c_algo_bit mei intel_smartconnect lpc_ich
  [29218.308208]  mac_hid ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack iptable_filter parport_pc ppdev ip_tables x_tables lp parport autofs4 hid_generic usbhid hid psmouse ahci r8169 libahci mii
  [29218.308231] CPU: 2 PID: 524 Comm: wl_event_handle Tainted: P        W  OE  3.19.0-16-generic #16-Ubuntu
  [29218.308232] Hardware name: Hewlett-Packard HP Pavilion 15 Notebook PC /2281, BIOS F.12 08/18/2014
  [29218.308233]  ffffffffc0478a78 ffff8801d55c3da8 ffffffff817c2235 0000000000000007
  [29218.308236]  0000000000000000 ffff8801d55c3de8 ffffffff8107595a ffff8801d23c9078
  [29218.308238]  ffff8801d26bb000 ffff8801d4a52b40 000000000000009f ffff8801c5b74b40
  [29218.308240] Call Trace:
  [29218.308246]  [<ffffffff817c2235>] dump_stack+0x45/0x57
  [29218.308250]  [<ffffffff8107595a>] warn_slowpath_common+0x8a/0xc0
  [29218.308252]  [<ffffffff81075a4a>] warn_slowpath_null+0x1a/0x20
  [29218.308260]  [<ffffffffc0454a81>] cfg80211_roamed+0x91/0xa0 [cfg80211]
  [29218.308290]  [<ffffffffc0a0b9fb>] wl_notify_roaming_status+0xcb/0x150 [wl]
  [29218.308312]  [<ffffffffc0a0875a>] wl_event_handler+0x6a/0x230 [wl]
  [29218.308333]  [<ffffffffc0a086f0>] ? wl_free_wdev.isra.23+0x80/0x80 [wl]
  [29218.308336]  [<ffffffff81094759>] kthread+0xc9/0xe0
  [29218.308339]  [<ffffffff81094690>] ? kthread_create_on_node+0x1c0/0x1c0
  [29218.308342]  [<ffffffff817c9298>] ret_from_fork+0x58/0x90
  [29218.308344]  [<ffffffff81094690>] ? kthread_create_on_node+0x1c0/0x1c0
  [29218.308346] ---[ end trace 0970ead2c419c952 ]---
  [29222.548357] cfg80211: Calling CRDA to update world regulatory domain
  [29222.575949] cfg80211: World regulatory domain updated:
  [29222.575952] cfg80211:  DFS Master region: unset
  [29222.575953] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
  [29222.575956] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29222.575958] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29222.575959] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29222.575961] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29222.575962] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29228.744616] cfg80211: Calling CRDA to update world regulatory domain
  [29228.753685] cfg80211: World regulatory domain updated:
  [29228.753696] cfg80211:  DFS Master region: unset
  [29228.753701] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
  [29228.753711] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29228.753718] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29228.753725] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29228.753731] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29228.753735] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: bcmwl-kernel-source 6.30.223.248+bdcom-0ubuntu2
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed May 13 16:50:24 2015
  InstallationDate: Installed on 2014-11-23 (171 days ago)
  InstallationMedia:
   
  SourcePackage: bcmwl
  UpgradeStatus: No upgrade log present (probably fresh install)

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