Raspberry Pi A Manuale Utente Scaricare il pdf (Pagina 3)

1. Ifthebluelightontheadaptercomeson,buttheadapterdoesnotacquireanIPaddress,

theproblemisin

wpa_supplicant.conf.ifconfigwillshowtheadapter,butnotanIP

address.

2. Ifthebluelightdoesnotcomeon,theproblemisintheearlierstages.

3. Usethecommandlineutility

dmesgreviewkernelmessages.Itishelpfultosavetheoutput

tofilesothatitcanbeeditedandexa minedatleisure(use

dmesg >dmesg.logandthen

editdmesg.log).

4. Despitethefactthatrtl8192cu.kohasbeenblocked,

dmesgstillgivesthefollowingmessage:

usbcore: registered new interface driver rtl8192cu.Thisdoesnotindicate

anerror.

dmesgdoesnotrecorderrormessagesrelatingtoerrorsinwpa_supplicant.conf.The

onlywaytoseetheseistobootwithadirectlyattacheddisplayandwatchthemessages

goingby.TheseareerrorssuchasafailuretoputquotesroundtheSSID.

Stability

TomaszMilasinhisveryhelpfulpostingRaspberryPimeetsEdimax

recommendsalargenumberof

fixestoimprovethestabilityoftheDebiansystem.ThesearenotrequiredtomaketheEdimax

adapterwork,butmaysolveotherproblems.

Theonlyproblemsdiscoveredsofarusing thestandardDebianimageandtheaboveconfiguration

changesarethatthewirelessconnection

doesnotre‐establishitselfafterthewirelessrouteris

rebooted,and/etc/init.d/networking restartbringsdownthenetworkbutdoesnotre‐

establishit,eitherforEthernetorwireless(possiblythesameproblem).

Removingthewifiadapterandreinsertingitdoesnotrestartthenetworkeither.

Additionalpoints

1. TheaboveconfigurationfileisforWPA2‐PSKandDHCP.WPA‐PSKandstaticIP

addresses

havenotbeentested.

2. Theaboveprocessiscumbersomeifyouwanttousedifferentwirelessaccesspoints,soyou

maywanttoconsideroneofthefollowing(nottested).

a. wicd

isanopensourcewiredandwirelessnetworkmanagerthatdoesnotrequire

graphicaldependencies.TheFarnellsitealsomentionswicd-curses,whichmayor

maynotbethesamething.

b. NetworkManager

isanetworkmanagerthatdoesusagraphicalinterface.

3. YoumaywanttoconfigureyourwirelessroutertogiveafixedIPaddresstotheRaspberryPi

Ethernetandwirelessconnections.

4. Youcanusethecommand

lsusbtoidentifythechip setusedbyyourwirelessadapter.



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Raspberry Pi A Manuale Utente Pagina 3

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