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[Oleg Shmelev <1379524@xxxxxxxxxxxxxxxxxx>]

I have exactly the same issue on my HP Pavilion 15-p163nr.

Issue: weak signal, frequent disconnects.
Kubuntu 14.04 LTS
Uname both: Linux 3.13.0-37-generic x86_64 and Uname: Linux 3.13.0-39-generic x86_64

And I did the same thing before I found this thread — build the driver from source found at http://www.broadcom.com/support/802.11/linux_sta.php and install it.
After that the signal is much better — but still after some time it loses the connectivity (without any apparent indication — i.e. 3 bars in notification icon but websites load forever.
In my attempt to fix that I did the following:
1. Set IPv6 in my connection settings to Ignore
2. Enforce the regulatory domain to my country code (from dmesg it seemed that regulatory domain was periodically switching from 'world' to 'Ru'):
sudo sed -i 's/^REG.*=$/&RU/' /etc/default/crda
sudo iw reg set RU
3. (Just in case):
sudo update-initramfs -u

And it seems to work almost fine now.

I also tried 14.10 and had issues with wifi too — the signal was OK but
it constantly disconnected and even to the point where my aweful DLink
Dir-300 had to be restarted — connection was repeatedly lost on my other
devices too.

PS. Hendrik, as far as I understand the 5 Ghz frequency is not supported
by the controller itself (at least for Pavilion 15-p163nr).

______________________
$ lspci -vnn -d 14e4:
08:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
        Subsystem: Hewlett-Packard Company Device [103c:2230]
        Flags: bus master, fast devsel, latency 0, IRQ 18
        Memory at b5500000 (64-bit, non-prefetchable) [size=32K]
        Capabilities: <access denied>
        Kernel driver in use: wl
______________________
$ lsmod | grep "brcmsmac\|ssb\|wl\|b43\|bcma"
wl                   6363686  0 
cfg80211              484040  1 wl
______________________
That's what I'm having now in:

$ dmesg | grep wl
[   11.946547] wl: module license 'unspecified' taints kernel.
[   11.949084] wl: module verification failed: signature and/or  required key missing - tainting kernel
[ 8974.077536] Modules linked in: pci_stub vboxpci(OX) vboxnetadp(OX) vboxnetflt(OX) vboxdrv(OX) bnep rfcomm uvcvideo videobuf2_vmalloc videobuf2_memops btusb videobuf2_core bluetooth videodev hp_wmi sparse_keymap snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm crct10dif_pclmul crc32_pclmul snd_hda_codec_realtek ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_hda_intel snd_hda_codec snd_hwdep joydev snd_pcm serio_raw snd_page_alloc snd_seq_midi snd_seq_midi_event lpc_ich snd_rawmidi wl(POX) snd_seq snd_seq_device rtsx_pci_ms cfg80211 snd_timer snd memstick mei_me mei soundcore hp_accel lis3lv02d hp_wireless input_polldev intel_smartconnect mac_hid parport_pc ppdev lp parport rtsx_pci_sdmmc nouveau i915 psmouse mxm_wmi ttm ahci i2c_algo_bit libahci drm_kms_helper r8169 drm mii rtsx_pci wmi video
[ 8974.077637] CPU: 0 PID: 441 Comm: wl_event_handle Tainted: P           OX 3.13.0-39-generic #66-Ubuntu
[ 8974.077847]  [<ffffffffa05a9f3b>] wl_notify_roaming_status+0xcb/0x150 [wl]
[ 8974.077942]  [<ffffffffa05a8b72>] wl_event_handler+0x62/0x220 [wl]
[ 8974.078014]  [<ffffffffa05a8b10>] ? wl_cfg80211_resume+0x440/0x440 [wl]

Let me know if any details from me could help.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to bcmwl in Ubuntu.
https://bugs.launchpad.net/bugs/1379524

Title:
  Weak wifi signal and bluetooth missing firmware

Status in “bcmwl” package in Ubuntu:
  Confirmed

Bug description:
  On a fresh install of Ubuntu 14.04 on my new HP Pavilion 15-020ng with
  Broadcom BCM43142 hybrid wifi/bluetooth chipset the official driver
  from Broadcom does not work correctly. On 2.4 GHz the wifi signal is
  so low that the connection is interrupted on a regular basis (network
  manager shows 26 Mb/s), other devices (notebook, tablet) do have a
  normal signal at the same position and even this laptop has a good
  signal with Windows 7 (Dual-Boot).

  In addition, Bluetooth does not work because the driver reports
  missing firmware but there does not seem to be official firmware
  available anywhere.

  The exact device name:
  08:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)

  The 5 Ghz frequency seems to be not supported by the driver according
  to the README file and does not work at all. My router is set to use
  WPA2-PSK with AES, which is the only possible option besides WPA or
  WPA/WPA2-mixed.

  I am using the official wl driver that was installed by default, also
  tried reinstalling via "sudo apt-get install bcmwl-kernel-source
  --reinstall" without improvement and "sudo iwconfig wlan0 power off".
  Also blacklisted b43, brcmsmac and bcma as suggested by "Linux
  Wireless".

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: bcmwl-kernel-source 6.30.223.141+bdcom-0ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Oct  9 23:04:07 2014
  InstallationDate: Installed on 2014-09-27 (12 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  SourcePackage: bcmwl
  UpgradeStatus: No upgrade log present (probably fresh install)

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