Brcmsmac connection stalling and timeout (14e4:4727)

Question

Using a netbook with a broadcom chipset and having wireless problems, pulling my hair out for a couple of months now. I've seen posts from other people with the exact same card for whom it works fine. My problem is constant connection stalling and timeouts. The wireless card connects and works for a few seconds before the connections stalls or speeds drop to very low speeds for about 30 seconds. After that the connection speeds increases for a few seconds and then it drops again.
For example, when I install packages from pacman it mostly goes like this. The speed drops, sometimes below 1KB/s resulting in a connection timeout and sometimes it goes back to about 300KB/s for a while, my max internet speed is 1500 KB/s btw.
libexif-0.6.21-2-x86_64 269.1 KiB 24.1K/s 00:02 [###################################################-------------] 81%
Wireless card info:
$ lspci -vnn | grep -i net
03:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter [14e4:4727] (rev 01)
07:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 06)
I already tried these things on a fully updated system:
https://wiki.archlinux.org/index.php/Wi … _times_out
Changing/forcing a specific b/g/n mode in the router configuration
Changing router channels, resetting router, upgrading router firmware
The broadcom wl driver instead of brcmsmac (this used to work with kernel <= 3.14)
Reinstalling the system
Upgrading bios firmware
Using another router
Using the card with another non unix OS (card works fine)
It's really frustrating, I hope someone has any ideas left.

Answer 1

Using a netbook with a broadcom chipset and having wireless problems, pulling my hair out for a couple of months now. I've seen posts from other people with the exact same card for whom it works fine. My problem is constant connection stalling and timeouts. The wireless card connects and works for a few seconds before the connections stalls or speeds drop to very low speeds for about 30 seconds. After that the connection speeds increases for a few seconds and then it drops again.
For example, when I install packages from pacman it mostly goes like this. The speed drops, sometimes below 1KB/s resulting in a connection timeout and sometimes it goes back to about 300KB/s for a while, my max internet speed is 1500 KB/s btw.
libexif-0.6.21-2-x86_64 269.1 KiB 24.1K/s 00:02 [###################################################-------------] 81%
Wireless card info:
$ lspci -vnn | grep -i net
03:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter [14e4:4727] (rev 01)
07:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 06)
I already tried these things on a fully updated system:
https://wiki.archlinux.org/index.php/Wi … _times_out
Changing/forcing a specific b/g/n mode in the router configuration
Changing router channels, resetting router, upgrading router firmware
The broadcom wl driver instead of brcmsmac (this used to work with kernel <= 3.14)
Reinstalling the system
Upgrading bios firmware
Using another router
Using the card with another non unix OS (card works fine)
It's really frustrating, I hope someone has any ideas left.