Hello, >-----Original Message----- >From: Kevin Locke <kevin@xxxxxxxxxxxxxxx> >Sent: Saturday, March 6, 2021 1:43 AM >To: Nitin Joshi <nitjoshi@xxxxxxxxx> >Cc: hdegoede@xxxxxxxxxx; ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx; platform- >driver-x86@xxxxxxxxxxxxxxx; Nitin Joshi1 <njoshi1@xxxxxxxxxx>; Mark RH >Pearson <markpearson@xxxxxxxxxx> >Subject: [External] Re: [PATCH 1/2] platorm/x86: thinkpad_acpi: sysfs >interface to reduce wlan tx power > >On Fri, 2021-02-12 at 14:58 +0900, Nitin Joshi wrote: >> Some newer Thinkpads have the WLAN antenna placed close to the WWAN >> antenna. In these cases FCC certification requires that when WWAN is >> active we reduce WLAN transmission power. A new Dynamic Power >> Reduction Control (DPRC) method is available from the BIOS on these >> platforms to reduce or restore WLAN Tx power. >> >> This patch provides a sysfs interface that userspace can use to adjust >> the WLAN power appropriately. > >Question from a user: How does wlan_tx_strength_reduce relate to or >interact with ioctl(SIOCSIWTXPOW) (i.e. iwconfig txpower) and >NL80211_ATTR_WIPHY_TX_POWER_LEVEL (i .e. iw dev set txpower)? If I >request 30 dBm then enable wlan_tx_strength_reduce, what happens? Same >in the opposite order? Will ioctl(SIOCGIWTXPOW) show the reduced >txpower? Below comment is just to update current status in this e-mail chain: As informed in separate e-mail, after testing by changing txpower using "iwconfig tx power xx" I cannot see any change in wlan_tx_strength_reduce It seems wlan_tx_strength_reduce is not directly related to iwconfig or iw. So, I am currently trying to find more information regarding this. Although, this patch is working fine but need some more information for better understanding. Hence , dropping this patch series and splitting it i.e submitting only "WWAN Antenna patch " now. Thank you !! Thanks & Regards, Nitin Joshi > >Thanks, >Kevin
