Hi, I found one pretty strange behavior for the Intel 8265/8275 wireless (from ThinkPad X1 carbon) If I ping *FROM* my router/desktop to the wireless laptop, the response time is very unstable and slow, like: ------ $ ping -4 thinkpad PING thinkpad.lan (172.16.0.100) 56(84) bytes of data. 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=1 ttl=64 time=143 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=2 ttl=64 time=166 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=3 ttl=64 time=188 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=4 ttl=64 time=211 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=5 ttl=64 time=29.8 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=6 ttl=64 time=51.7 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=7 ttl=64 time=72.8 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=8 ttl=64 time=94.6 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=9 ttl=64 time=117 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=10 ttl=64 time=140 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=11 ttl=64 time=163 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=12 ttl=64 time=186 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=13 ttl=64 time=207 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=14 ttl=64 time=25.1 ms 64 bytes from thinkpad.lan (172.16.0.100): icmp_seq=15 ttl=64 time=47.6 ms ----- It looks like the response time get increase by 20ms and flipped over around 200ms. But when pinging *FROM* the laptop to the router/desktop, it's completely fine: ------ $ ping openwrt PING openwrt.lan (172.16.0.1) 56(84) bytes of data. 64 bytes from _gateway (172.16.0.1): icmp_seq=1 ttl=64 time=2.52 ms 64 bytes from _gateway (172.16.0.1): icmp_seq=2 ttl=64 time=3.59 ms 64 bytes from _gateway (172.16.0.1): icmp_seq=3 ttl=64 time=2.54 ms 64 bytes from _gateway (172.16.0.1): icmp_seq=4 ttl=64 time=3.11 ms 64 bytes from _gateway (172.16.0.1): icmp_seq=5 ttl=64 time=2.93 ms 64 bytes from _gateway (172.16.0.1): icmp_seq=6 ttl=64 time=2.69 ms 64 bytes from _gateway (172.16.0.1): icmp_seq=7 ttl=64 time=3.49 ms 64 bytes from _gateway (172.16.0.1): icmp_seq=8 ttl=64 time=2.58 ms 64 bytes from _gateway (172.16.0.1): icmp_seq=9 ttl=64 time=2.75 ms 64 bytes from _gateway (172.16.0.1): icmp_seq=10 ttl=64 time=2.60 ms ------ The kernel is 4.18.12-arch1-1-ARCH, so it's pretty new. The BIOS of the ThinkPad is already updated with fwpud. BTW, if I boot that thinkpad with Windows, no matter I ping from/to that laptop, response time is always around 2~3ms. So is this something wrong with the wireless card or something wrong with the firmware/powersaving setting of ThinkPad X1 Carbon 6th gen? Thanks Qu
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