WiFi drops - EDIMAX EW-7811Un - Raspberry Pi Forums

-

hi everyone

have compute module on cmio board, running 2014-12-24 raspbian wheezy.
installed edimax ew-7811un wifi dongle on usb , pretty worked straight out of box once set wpa-supplicant information.

issue facing if wifi interface idle drops off network few seconds @ time.
if keep wifi interface busy (for example, doing ping compute module router) wifi stays no problem.

example if use ssh login compute module machine, ssh session stop responding if idle more few seconds.

if logon compute module via serial console, , there keep wifi busy doing :
ping 192.168.1.254 (my router address) ssh session work perfectly.

cannot see in /var/log/messages or /var/log/kernel explain why drops , re-establishes wifi when idle.

ideas?

could power management issue although takes rather longer few seconds kick in when wifi idle.

however, try adding file /etc/modprobe.d/8188eu.conf

code: select all

sudo nano /etc/modprobe.d/8188eu.conf
and adding single line content

code: select all

options 8188eu rtw_power_mgnt=0 rtw_enusbss=0
this disable power management 8188eu driver.


mrengman


raspberrypi



Comments

Post a Comment

Popular posts from this blog

VIDIOC_S_FMT error 16, Device or resource busy - Raspberry Pi Forums

-
dear all, working on image processing using raspberry pi, have installed intex usb web camera on raspberry pi. have used basic python script of image processing https://www.cl.cam.ac.uk/projects/raspb ... first.html required libraries installed on raspberry pi. script code: import imgproc imgproc import * # open webcam take pictures camera = camera(160, 120) # open viewer window display images viewer = viewer(160, 120, "the first step") # take picture camera img = camera.grabimage() # display image in viewer viewer.displayimage(img) # iterate on each pixel in image x in range(0, img.width): for y in range(0, img.height): # value @ xth column , yth row, place intensities variables red, green, blue = img[x, y] # test find colour dominant if red > green , red > blue: # red dominant, set pixel red img[x, y] = 255, 0, 0 elif green > red , green > blue: img[x, y] = 0, 255, 0 else: # if red or gr...
Read more

using a laptop skeleton to build a pi laptop - Raspberry Pi Forums

-
Image
i have laptop dead motherboard . can remove components laptop , in anyway possible connect raspberry pi inbuilt display , keyboard on laptop ? (and touchpad if possible). (i figured remove components inside , fix pie inside , use extended usb cable , connect available usb ports respective holes in laptop skeleton, same headphone out ) . i'm noob when comes pi . on topic appreciated if screen lvds type may possible use screen installing converter board. this: http://www.ebay.com/itm/hdmi-dvi-vga-dr ... 3027&rt=nc need model number of screen , ask seller if work. or search ebay using brand , model number. assuming screen in working order..... back-light not burnt out etc.. other devices...... can used if have usb interface not part of motherboard. have make connector. raspberrypi
Read more

Smoothing Capacitor value?

-
Image
hi everyone! i have question "smoothing capacitors". have 5v arduino project have 6 individual 5v components attached it. since need these running @ different times, wanted take similar approach of nick gammon's in helpful example (http://www.gammon.com.au/forum/?id=12106) , use few mosfets switch these little guys on & off individually (instead of regular arduino pins), while minimizing potential power surges affect microcontroller and/or components themselves. these components 5v, , have maximum draw of ~170ma when powered on @ same time. so, if used 6 different mosfet switches turn switch +5v power line on each component directed via arduino uno, wondering: 1. still use 1 capacitor (like nick did in example)? 2. capacitor of 100uf work, or should use bigger? my plan first test circuit mosfets & capacitor(s) using usb, , later on, moving project battery power. thanks in advance ideas & suggestions! quote these little guys what ...
Read more