Comment 9 for bug 989175

OK, I think I have found the reason for this bug. It is not due to stage 2 in power nap, but rather stage 1 - during powersave mode the ethernet configuration for the card is changed, which deactivates wake-on-lan.

Since power nap first enters in stage1 then stage2, when the computer is turned off (or suspended) in stage 2, the wake-on-lan is deactivated... Of course I do *not* see this when manually shutting down, because my typing on the console or through ssh gets the computer out of powersave mode.

Here is the log file which demonstrates this. It is produced by a while loop which logs the end of /var/log/powernap.log and the result of "ethtool eth0" every 5 seconds. As you can see below the first two logged entries (at t=0s and t=5s) have "Wake-on: g" but at t=+10s there is "Wake-on: d" which I assume means deactivated...

=> I am not sure where power nap changes this, isn't it supposed to just change speed ?

####### Time series of /var/log/powernap.log and "ethtool eth0" at 5s intervals #########

samedi 28 avril 2012, 11:24:08 (UTC+0200)
2012-04-28_11:23:45 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [3] seconds
2012-04-28_11:23:46 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [2] seconds
2012-04-28_11:23:46 WARNING Taking action [/usr/sbin/powernap]
2012-04-28_11:23:50 WARNING Taking recover action [/usr/sbin/pm-powersave false]
2012-04-28_11:23:59 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [6] seconds
2012-04-28_11:24:00 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [5] seconds
2012-04-28_11:24:02 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [4] seconds
2012-04-28_11:24:05 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [6] seconds
2012-04-28_11:24:06 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [5] seconds
2012-04-28_11:24:08 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [4] seconds
Settings for eth0:
 Supported ports: [ TP MII ]
 Supported link modes: 10baseT/Half 10baseT/Full
                         100baseT/Half 100baseT/Full
                         1000baseT/Half 1000baseT/Full
 Supported pause frame use: No
 Supports auto-negotiation: Yes
 Advertised link modes: 10baseT/Half 10baseT/Full
                         100baseT/Half 100baseT/Full
                         1000baseT/Half 1000baseT/Full
 Advertised pause frame use: Symmetric Receive-only
 Advertised auto-negotiation: Yes
 Link partner advertised link modes: 10baseT/Half 10baseT/Full
                                      100baseT/Half 100baseT/Full
                                      1000baseT/Half 1000baseT/Full
 Link partner advertised pause frame use: Symmetric Receive-only
 Link partner advertised auto-negotiation: Yes
 Speed: 1000Mb/s
 Duplex: Full
 Port: MII
 PHYAD: 0
 Transceiver: internal
 Auto-negotiation: on
 Supports Wake-on: pumbg
 Wake-on: g
 Current message level: 0x00000033 (51)
          drv probe ifdown ifup
 Link detected: yes

samedi 28 avril 2012, 11:24:13 (UTC+0200)
2012-04-28_11:23:50 WARNING Taking recover action [/usr/sbin/pm-powersave false]
2012-04-28_11:23:59 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [6] seconds
2012-04-28_11:24:00 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [5] seconds
2012-04-28_11:24:02 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [4] seconds
2012-04-28_11:24:05 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [6] seconds
2012-04-28_11:24:06 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [5] seconds
2012-04-28_11:24:08 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [4] seconds
2012-04-28_11:24:10 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [6] seconds
2012-04-28_11:24:11 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [5] seconds
2012-04-28_11:24:12 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [4] seconds
Settings for eth0:
 Supported ports: [ TP MII ]
 Supported link modes: 10baseT/Half 10baseT/Full
                         100baseT/Half 100baseT/Full
                         1000baseT/Half 1000baseT/Full
 Supported pause frame use: No
 Supports auto-negotiation: Yes
 Advertised link modes: 10baseT/Half 10baseT/Full
                         100baseT/Half 100baseT/Full
                         1000baseT/Half 1000baseT/Full
 Advertised pause frame use: Symmetric Receive-only
 Advertised auto-negotiation: Yes
 Link partner advertised link modes: 10baseT/Half 10baseT/Full
                                      100baseT/Half 100baseT/Full
                                      1000baseT/Half 1000baseT/Full
 Link partner advertised pause frame use: Symmetric Receive-only
 Link partner advertised auto-negotiation: Yes
 Speed: 1000Mb/s
 Duplex: Full
 Port: MII
 PHYAD: 0
 Transceiver: internal
 Auto-negotiation: on
 Supports Wake-on: pumbg
 Wake-on: g
 Current message level: 0x00000033 (51)
          drv probe ifdown ifup
 Link detected: yes

samedi 28 avril 2012, 11:24:18 (UTC+0200)
2012-04-28_11:24:02 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [4] seconds
2012-04-28_11:24:05 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [6] seconds
2012-04-28_11:24:06 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [5] seconds
2012-04-28_11:24:08 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [4] seconds
2012-04-28_11:24:10 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [6] seconds
2012-04-28_11:24:11 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [5] seconds
2012-04-28_11:24:12 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [4] seconds
2012-04-28_11:24:13 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [3] seconds
2012-04-28_11:24:15 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [2] seconds
2012-04-28_11:24:15 WARNING Taking action [/usr/sbin/powernap]
Settings for eth0:
 Supported ports: [ TP MII ]
 Supported link modes: 10baseT/Half 10baseT/Full
                         100baseT/Half 100baseT/Full
                         1000baseT/Half 1000baseT/Full
 Supported pause frame use: No
 Supports auto-negotiation: Yes
 Advertised link modes: 10baseT/Half 10baseT/Full
                         100baseT/Half 100baseT/Full
                         1000baseT/Half 1000baseT/Full
 Advertised pause frame use: Symmetric Receive-only
 Advertised auto-negotiation: Yes
 Link partner advertised link modes: 10baseT/Half 10baseT/Full
                                      100baseT/Half 100baseT/Full
                                      1000baseT/Half 1000baseT/Full
 Link partner advertised pause frame use: Symmetric Receive-only
 Link partner advertised auto-negotiation: Yes
 Speed: 1000Mb/s
 Duplex: Full
 Port: MII
 PHYAD: 0
 Transceiver: internal
 Auto-negotiation: on
 Supports Wake-on: pumbg
 Wake-on: d
 Current message level: 0x00000033 (51)
          drv probe ifdown ifup
 Link detected: yes

samedi 28 avril 2012, 11:24:23 (UTC+0200)
2012-04-28_11:24:02 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [4] seconds
2012-04-28_11:24:05 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [6] seconds
2012-04-28_11:24:06 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [5] seconds
2012-04-28_11:24:08 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [4] seconds
2012-04-28_11:24:10 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [6] seconds
2012-04-28_11:24:11 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [5] seconds
2012-04-28_11:24:12 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [4] seconds
2012-04-28_11:24:13 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [3] seconds
2012-04-28_11:24:15 WARNING Entered into GRACE PERIOD. Action [/usr/sbin/powernap] will be taken in [2] seconds
2012-04-28_11:24:15 WARNING Taking action [/usr/sbin/powernap]
Settings for eth0:
 Supported ports: [ TP MII ]
 Supported link modes: 10baseT/Half 10baseT/Full
                         100baseT/Half 100baseT/Full
                         1000baseT/Half 1000baseT/Full
 Supported pause frame use: No
 Supports auto-negotiation: Yes
 Advertised link modes: 10baseT/Half 10baseT/Full
                         100baseT/Half 100baseT/Full
                         1000baseT/Half 1000baseT/Full
 Advertised pause frame use: Symmetric Receive-only
 Advertised auto-negotiation: Yes
 Link partner advertised link modes: 10baseT/Half 10baseT/Full
                                      100baseT/Half 100baseT/Full
                                      1000baseT/Half 1000baseT/Full
 Link partner advertised pause frame use: Symmetric Receive-only
 Link partner advertised auto-negotiation: Yes
 Speed: 1000Mb/s
 Duplex: Full
 Port: MII
 PHYAD: 0
 Transceiver: internal
 Auto-negotiation: on
 Supports Wake-on: pumbg
 Wake-on: d
 Current message level: 0x00000033 (51)
          drv probe ifdown ifup
 Link detected: yes