Hello,I've been trying to get rtl8192cu work on ARM board I got recently. While I don't get crashes anymore and I can connect to AP, open connections, do short transfers, eventually rtl8192cu goes silent (bulk-IN urbs stop completing, no packets received). Bringing interface down and back up does not help, I need to rmmod/modprobe to wake the device.
I noticed that, when doing large transfer (with iperf), "signal avg" reading from iw started to behave interestingly...
Idle (0.1 sec interval):
signal avg: -75 dBm
signal avg: -68 dBm
signal avg: -72 dBm
signal avg: -73 dBm
signal avg: -74 dBm
signal avg: -75 dBm
signal avg: -75 dBm
signal avg: -75 dBm
signal avg: -75 dBm
signal avg: -74 dBm
While doing TCP transfer, rtl8192cu at RX side (0.1sec intervals):
signal avg: -88 dBm
signal avg: -13 dBm
signal avg: -38 dBm
signal avg: 100 dBm
signal avg: -11 dBm
signal avg: 122 dBm
signal avg: 51 dBm
signal avg: 77 dBm
signal avg: -14 dBm
signal avg: -18 dBm
signal avg: 78 dBm
signal avg: 46 dBm
signal avg: -65 dBm
signal avg: -103 dBm
signal avg: -90 dBm
signal avg: 88 dBm
signal avg: -43 dBm
signal avg: -12 dBm
This keeps on until rtl8129cu goes silent.
I have attached kernel log with rtl8192cu loaded with debug=4.
Connection stops working around timestamp 1377. (Log shows some BUGs
which do appear with debugging on but not without.)
Apparently triggering this hang becomes much harder to trigger when debug=4 is enabled... probably because debug logging increasing CPU usage, transfer rate drops to 1Mbit/s and above symptom mostly disappears. Without debug=4, RX runs at ~28Mbit/s.
-Jussi
Bus 004 Device 002: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0bda Realtek Semiconductor Corp.
idProduct 0x8176 RTL8188CUS 802.11n WLAN Adapter
bcdDevice 2.00
iManufacturer 1 Realtek
iProduct 2 802.11n WLAN Adapter
iSerial 3 00e04c000001
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 46
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
Attachment:
log.txt.xz
Description: application/xz
