Ubuntu 11.04 wireless connection 802.11 Draft-N not available
 

I have an Acer Aspire 2930Z notebook, and have a wireless network problem...

When I installed Ubuntu 11.04 everything worked out of the box and I was extremely happy, but now that I have some other notebooks around I noticed that transferring files to the Acer Aspire 2930Z notebook did take a bit longer...

So after some digging I found out that the 2930Z only connects in the IEEE 802.11b/g range (max. 54mbit), while the specifications of Acer clearly specify that it also supports IEEE 802.11-Draft-N.

When I run MS Windows XP on the notebook I have no problem connecting at the Draft-N speed...

When I run lspci -v | less I see...

06:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)

The driver Ubuntu installs is clearly the correct one, so before I pull my hair what I'm I doing wrong?

Okay lets ask another question, are any of you Ubuntu users connect with your router using IEEE 802.11n?

The BCM4312 is no draft N-product, it can only do a,b and g.

The notebook, a Acer Aspire 2930Z, has 802.11 a/b/g/n capabilities – you can find this with a simple search on Internet – also the specifications from Acer specify that it is capable of doing Draft-N.

I cannot help it, nor do I know, why Ubuntu have selected the Broadcom BCM4312 driver, is it that it see only the possible compatible part of the wireless chipset? In Ubuntu 10.04 I'm sure I used a Realtek wireless chipset driver... Only since I installed Ubuntu 11.04 I'm using the Broadcom BCM4312 driver...

I have the same BCM4312 device in my laptop and can assure (and had also a look at the Broadcom website) that it is not a draft N device. May it be that you had an additional USB device?

Okay it is really simple this are the specifications of my notebook http://support.acer.com/acerpanam/no...2930Zsp3.shtml

Everybody can read that my notebook should support Acer InviLink™ Nplify™ 802.11b/g/Draft-N Wi-Fi CERTIFIED® network connection

You are right, in those specifications it states that your card can do Draft-N. If you have the InviLink Nplify option in your notebook. They also state this, one line under that:And the description of the BCM4312 can be found here, and they don't mention Draft N there.

Therefore how can Ubuntu see the wrong wireless chipset?

I would be astonished if two chipsets would be built-in in that laptop, and I don't know if it is even possible that the kernel can see the wrong chipset, the PCI-IDs should be rather unique.
Have you tried it with with a different distro to see if the same error occurs?