I'm attempting to run pm-suspend on my laptop (by shutting my lid and on command line), and its putting my AR9485 wifi card into a funk (i.e. wlan0 interface seen through ifconfig never returns upon resume). I know theres a lot to this (power management - pm-utils and kernel, wireless drivers, general linux drivers, and possibly other things), just need a little direction on which rabbit hole to start down...haha. Ive looked through the ath9k and wireless list archives and had no luck finding the same issue. I have tried different solutions (mostly related to pm-utils) from ubuntu's forums too. an example of where it failed /var/log/pm-powersave.log <snip> Running hook /usr/lib/pm-utils/power.d/wireless true: Turning powersave for wlan0 on...Error for wireless request "Set Power Management" (8B2C) : SET failed on device wlan0 ; Operation not supported. Failed. /usr/lib/pm-utils/power.d/wireless true: success. <snip> AND...according to https://wireless.wiki.kernel.org/en/users/documentation/dynamic-power-save I tried: iw dev wlan0 set power_save on command failed: Operation not supported (-95) This is my first post to this list, so I'm not sure what information would be useful to help find a solution (or workaround). Here goes nothing (perhaps I should attach text files next time for large diagnostic information?): I built an upstream kernel against gregkh staging tree with a Ubuntu distro just to see if this would fix my issue and it did not. Either way, here is some information:
uname -a Linux xxx 4.2.0+ #1 SMP Sun Sep 6 05:53:34 EDT 2015 x86_64 x86_64 x86_64 GNU/Linux
lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.3 LTS Release: 14.04 Codename: trusty
cat /proc/version Linux version 4.2.0+ (gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04) ) #1 SMP Sun Sep 6 05:53:34 EDT 2015
lspci -vvnn <snip> 01:00.0 Network controller [0280]: Qualcomm Atheros AR9485 Wireless Network Adapter [168c:0032] (rev 01) Subsystem: Hewlett-Packard Company AR9485/HB125 802.11bgn 1×1 Wi-Fi Adapter [103c:1838] <snip>
I could provide more information from lspci and lshw but I'm not sure what would help (if at all). The strangest thing about the whole matter is that if I reboot, the card comes back online just fine. Thanks again for any help you can provide! David