September 11th, 2014, 12:02 PM

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.
wlan0 IEEE 802.11bgn ESSID:'wibon1'
Mode:Managed Frequency:2.437 GHz Access Point: 10:FE:ED:C2:F2:06
Bit Rate=135 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thrff Fragment thrff
Power Managementff
Link Quality=70/70 Signal level=-39 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:4 Invalid misc:62 Missed beacon:0
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.
boon1987@boon1987-System-Product-Name:~$ lsusb
Bus 002 Device 003: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 005: ID 22b8:2e24 Motorola PCS
Bus 001 Device 003: ID 2001:3c22 D-Link Corp.
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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.
#ifdef RT5370
{USB_DEVICE(0x148F,0x5370)}, /* Ralink 5370 */
{USB_DEVICE(0x148F,0x5372)}, /* Ralink 5370 */
{USB_DEVICE(0x13D3,0x3365)}, /* Azurewave */
{USB_DEVICE(0x13D3,0x3329)}, /* Azurewave */
{USB_DEVICE(0x2001,0x3C15)}, /* Alpha */
{USB_DEVICE(0x2001,0x3C19)}, /* Alpha */
{USB_DEVICE(0x2001,0x3C1C)}, /* DLink */
{USB_DEVICE(0x2001,0x3C1D)}, /* DLink */
{USB_DEVICE(0x2001,0x3c22)}, /* D-Link DWA-132 revision B1 */
{USB_DEVICE(0x043E,0x7A12)}, /* Arcadyan */
{USB_DEVICE(0x043E,0x7A22)}, /* LG innotek */
#endif // RT5370 //
#ifdef RT5372
{USB_DEVICE(0x148F,0x5372)}, /* Ralink 5372 */
{USB_DEVICE(0x13D3,0x3365)}, /* Azurewave */
#endif /* RT5372 */
After all steps above, i succeed to compile. And then modprobe the rt5370sta. This driver can detect my Wireless card but 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,