For my Dell Wireless 1397 WLAN Mini-Card [1028:000c], the open source driver makes DL rate stuck to 2Mb/s (~240kB/s) when UL reaches 8/10 Mb/s, any channel. The broadcom driver reaches these 8/10Mb/s both for UL & DL for channel 1-11, but unfortunately I can't connect to channels 12-13 APs. I enabled proposed repos so that I can get the latest linux-firmware-nonfree 1.14ubuntu3 and can enable latest bcmwl-kernel-source 6.30.223.271+bdco, with no success. The opensource driver seems to be called b43-pci-bridge, when the proprietary seems to be called wl.
iw reg get
country 00:
(2402 - 2472 @ 40), (3, 20)
(2457 - 2482 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(2474 - 2494 @ 20), (3, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
(5170 - 5250 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(5735 - 5835 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
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