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FS#557 - Nexx wt3020 wifi rx sensitivity low with LEDE 17.01 #8007
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psyborg55: you need to use this patch lede-project/source@b367eef |
fabianhu: I tried hard by setting my repo to the commit mentioned by @psyborg55. with LEDE (luci): I see only my own AP with 75% signal strength at < 1m distance With the original FW I see ~10 more from my neighbors. does anyone have any directions for me? |
rogerpueyo: The patch mentioned above was commited to the master branch, so the snapshot builds already have it. You may want to give the snapshot compilation a try (if you are familiar with the command line, as they don't include the web GUI). You can find them at https://downloads.lede-project.org/snapshots/targets/ramips/mt7620/. Try flashing both 17.01.0 and the snapshot and check if there are any differences. |
Greybeard: See my comment in the original bug report. No difference between 17.01.0 and snapshot as of 24/2/17. The patch indicates it was committed 20/1/17 so it should have been in the 24//17 snapshot that I tested with. |
nbd: Please try the latest snapshot |
Greybeard: Tried with LEDE Reboot SNAPSHOT r3975-97d1c49 root@LEDE:~# iw list |
psyborg55: next time indicate in your issue report your device use MT7620N |
Greybeard: Yes Sir |
psyborg55: can you post RF calibration data from your device? |
Greybeard: Can point me to info about how to get the rf cal data? I've done a quick search on the lede forum but haven't found anything so far. |
psyborg55: run from ssh console: dd if=/dev/mtd2 of=/tmp/mtd2 |
Greybeard: result of mtd2 download uploaded |
psyborg55: add chanregs 14, 17 and 18 to your rt2800lib.c file like this and rebuild image:
try checking again if the RSSI got any better |
Greybeard: Built a dev system and made the suggested changes in ~/source/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7620/compat-wireless-2017-01-31/drivers/net/wireless/ralink/rt2x00/rt2800lib.c around line 5287 flashed the wt3020 device and rx signal strength reported as -64/68 compared to -64/66 with 17.01.2 and snapshot r4741-7a8909411c near enough to no change. As a check a physically adjacent device (a5v11) reports rx signal strength ~-44. Both wt3020 and a5v11 have rx signal on wr842 (ap) as ~-40. |
psyborg55: this is the report i got about mt7620n devices. probably unrelated at all to these registers |
Greybeard: I won't be able to get back to this for a couple of weeks. I read a suggestion that the code by padavan doesn't have this issue. I'll see if I can get a copy and do some comparisons to see if there is anything obvious and/or try the code. |
Greybeard: Issue still present in 18.06.1 |
Greybeard:
The rx sensitivity reported by a Nexx wt3020 is ~ 20dB lower than a comparable tp-link device located sided by side with the Nexx wt3020.
There have been reports of a similar problem with OpenWRT versions.
There is a ticket open with openwrt with a similar reported issue https://dev.openwrt.org/ticket/20369 as well as on the openwrt forum https://forum.openwrt.org/viewtopic.php?id=69042
lede trunk (and openwrt trunk) as of 24/2/17 also display similar poor rx sensitivity.
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