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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1997200
and then change the status of the bug to 'Confirmed'.
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1997200
Title:
Mediatek WLAN RZ616(MT7922) SAR table control
Status in HWE Next:
New
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
In order to make sure the amount of RF energy being absorbed by our bodies is
safe according to the FCC’s guidelines, products must undergo and pass SAR
testing.
[Fix]
Add ACPI SAR table control to pass the testing.
[Test]
the unit is 0.5dBm in following:
Without the SAR table control:
$ sudo cat /sys/kernel/debug/ieee80211/phy0/mt76/txpower_sku | grep -i user
CCK (user) : N.A N.A N.A N.A
OFDM (user) : 40 40 40 40 40 40 40 40
HT20 (user) : 40 40 40 40 40 40 40 40
HT40 (user) : 40 40 40 40 40 40 40 40
40
VHT20 (user) : 40 40 40 40 40 40 40 40
40 40 0 0
VHT40 (user) : 40 40 40 40 40 40 40 40
40 40 0 0
VHT80 (user) : 40 40 40 40 40 40 40 40
40 40 0 0
VHT160 (user) : 40 40 40 40 40 40 40 40
40 40 0 0
HE26 (user) : 40 40 40 40 40 40 40 40
40 40 40 40
HE52 (user) : 40 40 40 40 40 40 40 40
40 40 40 40
HE106 (user) : 40 40 40 40 40 40 40 40
40 40 40 40
HE242 (user) : 40 40 40 40 40 40 40 40
40 40 40 40
HE484 (user) : 40 40 40 40 40 40 40 40
40 40 40 40
HE996 (user) : 40 40 40 40 40 40 40 40
40 40 40 40
HE996x2 (user) : 40 40 40 40 40 40 40 40
40 40 40 40
After enabled SAR table control:
$ sudo cat /sys/kernel/debug/ieee80211/phy0/mt76/txpower_sku | grep -i user
CCK (user) : N.A N.A N.A N.A
OFDM (user) : 26 26 26 26 26 26 26 26
HT20 (user) : 26 26 26 26 26 26 26 26
HT40 (user) : 26 26 26 26 26 26 26 26
26
VHT20 (user) : 26 26 26 26 26 26 26 26
26 26 0 0
VHT40 (user) : 26 26 26 26 26 26 26 26
26 26 0 0
VHT80 (user) : 26 26 26 26 26 26 26 26
26 26 0 0
VHT160 (user) : 26 26 26 26 26 26 26 26
26 26 0 0
HE26 (user) : 26 26 26 26 26 26 26 26
26 26 26 26
HE52 (user) : 26 26 26 26 26 26 26 26
26 26 26 26
HE106 (user) : 26 26 26 26 26 26 26 26
26 26 26 26
HE242 (user) : 26 26 26 26 26 26 26 26
26 26 26 26
HE484 (user) : 26 26 26 26 26 26 26 26
26 26 26 26
HE996 (user) : 26 26 26 26 26 26 26 26
26 26 26 26
HE996x2 (user) : 26 26 26 26 26 26 26 26
26 26 26 26
Also done stress test with iperf, all works fine.
[Where problems could occur]
It may break mt7922 driver.
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