Good evening to all of you,

Problem Description:

I bought an wireless adapter recently. It is D-Link DWA-132 revision B1 European Model. It has Ralink chipset RT5372 chipset. I am using Ubuntu 14.04 LTS 64 Bit. I can be detected on my Ubuntu through RT2800USB. However there is a huge problem: the wireless speed is half of the internet speed. For example, suppose the internet speed is 1M bandwith, it only able to download at 512kB/s. I browse a ton of forum and know this problem is caused by Excessive Retry and Invalid Misc as shown as highlighted information below.
As you can see, the Tx excessive retries and Invalid misc show up within a few second after i connect to internet. When i use for few minutes, these number will increase exponentially.
Attempted solution:

I followed the guide from this link: https://help.ubuntu.com/community/WifiDocs/Device/Tenda_W311M to solve my problem. However, i cannot compile driver provided by official mediatek: http://www.ralinktech.com/en/04_support/support.php?sn=501. As a result, i download the driver package called 4365112-2011_0719_RT3070_RT3370_RT5370_RT5372_V2.5.0.3_pre pared.tar.gz from guide : http://harkko.lattu.biz/notes/rt5370_ubuntu.html. This driver package can be compiled but do not have my wireless device id. So, i add my usb id 2001:3c22 to the /Besides, i also add a USB device id as shown as information below before i compile the driver provided by the link.
The file named rtusb_dev_id.c (located in driver_package/common/rtusb_dev_id.c) in the driver package is used to store the ID of USB wireless adapter. So I put 2001:3c22 according to the guide on the website. I also did try to put under section #ifdef RT5372 section but same issue.
After all steps above, i succeed to compile. And then modprobe the rt5370sta. This driver can detect my Wireless cardbut it cause my system crash and show kernel panic in black screen. I have no choice but restart my system using reset swith on my PC case physical button.
Question:

Since i cannot compile the driver from the official website of mediatek, i just can try to use the driver package provided by other developer as shown in step above. But it does not work. So i hope somebody can guide me to solve this problem or give me some suggestion.
Thank You,

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