Ticket #2043 (new defect)

Opened 10 years ago

Last modified 16 months ago

GTA02 WiFi signal reception too weak

Reported by: vnevoa Owned by: openmoko-devel
Priority: normal Milestone:
Component: unknown Version: Om2008.8
Severity: normal Keywords:
Cc: Blocked By:
Blocking: Estimated Completion (week):
HasPatchForReview: PatchReviewResult:
Reproducible: always

Description

Software: OM2008.9 with "testing" feeds. Updated and rebooted today.

Comparing the Neo FR's wifi signal strength to other portable systems apparently indicates that the FR's wifi system has very bad signal reception. This may be at the root of many of the other numerous wifi tickets.

Use case: placed the FR and a Eee901 side-by-side, and scanned for wireless networks on both. (I had to switch off the Eee901 before scanning with the FR, or the interference would kill the signal on the FR).
Here the output of both scans:

===========Eee901=========
vasco@van-eee:~$ iwlist scan
ra0 Scan completed :

Cell 01 - Address: 00:11:88:A4:6B:62

ESSID:"INTERNET"
Mode:Managed
Channel:6
Quality:20/100 Signal level:-82 dBm Noise level:-97 dBm
Encryption key:off
Bit Rates:36 Mb/s

Cell 02 - Address: 00:21:29:8A:C5:EE

ESSID:"linksys"
Mode:Managed
Channel:5
Quality:34/100 Signal level:-76 dBm Noise level:-97 dBm
Encryption key:off
Bit Rates:36 Mb/s

Cell 03 - Address: 00:11:88:A4:6B:60

ESSID:""
Mode:Managed
Channel:6
Quality:15/100 Signal level:-84 dBm Noise level:-97 dBm
Encryption key:off
Bit Rates:36 Mb/s

Cell 04 - Address: 00:14:BF:65:86:2A

ESSID:"INS"
Mode:Managed
Channel:7
Quality:20/100 Signal level:-82 dBm Noise level:-97 dBm
Encryption key:on
Bit Rates:11 Mb/s

Cell 05 - Address: 00:14:7C:B1:D8:B2

ESSID:""
Mode:Managed
Channel:11
Quality:15/100 Signal level:-84 dBm Noise level:-97 dBm
Encryption key:on
Bit Rates:22 Mb/s

=========Neo FR==========
root@om-gta02:~# iwlist scan
eth0 Scan completed :

Cell 01 - Address: 00:21:29:8A:C5:EE

ESSID:"linksys"
Mode:Master
Frequency:2.432 GHz (Channel 5)
Quality=4/94 Signal level=-91 dBm Noise level=-95 dBm
Encryption key:off
Extra:bcn_int=100

Cell 02 - Address: 00:11:88:A4:6B:60

ESSID:""
Mode:Master
Frequency:2.437 GHz (Channel 6)
Quality=4/94 Signal level=-91 dBm Noise level=-95 dBm
Encryption key:off
Extra:bcn_int=100

So, the FR "sees" only 2 networks instead of 5.

And for the strongest network, it shows Signal/Noise? of -91dBm/-95dBm when the Eee901 shows -76dBm/-97dBm.

I think its ok that the FR has 2dBm more noise level (smaller device, more compact electronics, more EMI), but it worries me that the signal level is 15dBm lower!...

Desired behavior: FR should identify all present networks and be able to connect to those that have an acceptable signal power, just like other mobile devices.

Attachments

wifi-fr-dmesg.txt (13.4 KB) - added by vnevoa 10 years ago.
dmesg
wifi-fr-log.txt (63.9 KB) - added by vnevoa 10 years ago.

Change History

Changed 10 years ago by vnevoa

dmesg

Changed 10 years ago by vnevoa

comment:1 Changed 10 years ago by andy

Not really excusing the behaviour, but two ideas:

Signal quality reported for AR6000 driver is probably bogus.

The firmware can choose to hide results from the iwlist eth0 scan. iwl4965 does this, sometimes to the point it gets confused and hides everything, but will connect by ap mac. So it may not represent what it really sees there either.

comment:2 Changed 10 years ago by vnevoa

We should check if those reports are bogus or not. Is there a way to check these values?

comment:3 Changed 10 years ago by vnevoa

Why isn't there any update on this bug? Do you need more info?

comment:4 Changed 10 years ago by werner

Just spotted it today :-) I don't really know if our WLAN performs much
worse than one could expect. Since wireless results tend to be quite
variable and often open to interpretation, I'd suggest to discuss the
issue on a proper mailing list. I've started a thread here:
http://lists.openmoko.org/pipermail/hardware/2008-October/000693.html

comment:5 Changed 16 months ago by RoberMync

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