[SOLVED] NetworkManager taking long time to show available wireless

I've been using Arch since May. I never had any problems connecting to wifi--my laptop has always connected automatically to my home wireless network within a few seconds of booting to my desktop. I use Network Manager, with the network-manager-applet on my panel.
All of a sudden, for no apparent reason, every time I boot now I cannot connect to the internet for several minutes: When I click on the panel applet there are no available wireless networks listed. It's only after several minutes (it varies slightly, usually after about 2 minutes) that available wireless networks finally show up in the applet.
The physical wifi switch on the laptop is securely in the "on" position. NetworkManager is running as soon as the system boots, and lsmod shows me that iwlwifi module is loaded. There are no errors in the journal. I haven't changed any network settings in a long time. Why is it suddenly taking NetworkManager several minutes to show me the available wireless networks after a reboot?
EDIT: During the time when I have no wireless networks available I get this:
eileen@vaio ~ $ nmcli general status
STATE CONNECTIVITY WIFI-HW WIFI WWAN-HW WWAN
disconnected none enabled enabled enabled enabled
eileen@vaio ~ $ iwconfig # notice that wlp2s0 is not listed in the output!
enp4s0 no wireless extensions.
lo no wireless extensions.
eileen@vaio ~ $ nmcli dev connect wlp2s0
Error: Device 'wlp2s0' not found.
eileen@vaio ~ $ sudo ip link set wlp2s0 up
Cannot find device "wlp2s0"
After wireless networks finally show up in the applet, I get this:
eileen@vaio ~ $ nmcli general status
STATE CONNECTIVITY WIFI-HW WIFI WWAN-HW WWAN
connected full enabled enabled enabled enabled
eileen@vaio ~ $ iwconfig
enp4s0 no wireless extensions.
wlp2s0 IEEE 802.11abgn ESSID:"blue"
Mode:Managed Frequency:2.437 GHz Access Point: 98:FC:11:86:9C:EC
Bit Rate=78 Mb/s Tx-Power=15 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=62/70 Signal level=-48 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:34 Missed beacon:0
lo no wireless extensions.
tun0 no wireless extensions.
Could the problem be that the kernel is taking a long time to detect my wireless card and designate it as wlp2s0 (which needs to happen before NetworkManager can do anything)? If so, how can I tell the kernel to prioritize looking for a wireless card when the system boots?
Last edited by bdantas (2014-12-09 03:22:29)

After I'm finally connected, dmesg gives me this:
eileen@vaio ~ $ dmesg | grep iwlwifi
[ 15.089340] iwlwifi 0000:02:00.0: can't disable ASPM; OS doesn't have ASPM control
[ 15.089499] iwlwifi 0000:02:00.0: irq 44 for MSI/MSI-X
[ 15.190528] iwlwifi 0000:02:00.0: Direct firmware load failed with error -2
[ 15.190531] iwlwifi 0000:02:00.0: Falling back to user helper
[ 75.324699] iwlwifi 0000:02:00.0: Direct firmware load failed with error -2
[ 75.324705] iwlwifi 0000:02:00.0: Falling back to user helper
[ 135.843224] iwlwifi 0000:02:00.0: loaded firmware version 9.221.4.1 build 25532 op_mode iwldvm
[ 135.926866] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEBUG disabled
[ 135.926874] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEBUGFS disabled
[ 135.926879] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
[ 135.926885] iwlwifi 0000:02:00.0: Detected Intel(R) Centrino(R) Advanced-N 6200 AGN, REV=0x74
[ 135.926991] iwlwifi 0000:02:00.0: L1 Enabled - LTR Disabled
[ 136.063045] iwlwifi 0000:02:00.0: L1 Enabled - LTR Disabled
[ 136.069775] iwlwifi 0000:02:00.0: Radio type=0x1-0x3-0x1
[ 136.288670] iwlwifi 0000:02:00.0: L1 Enabled - LTR Disabled
[ 136.295360] iwlwifi 0000:02:00.0: Radio type=0x1-0x3-0x1
Notice the firmware load failures at 15 and 75 seconds after boot, and the fact that it's not until 135 seconds that the firmware for the wireless card is finally loaded.
This suggests to me that the culprit is either the kernel (and/or its iwlwifi module) or the actual firmware. I will try different versions of these packages (linux, linux-lts, and linux-firmware) and will report back.
Last edited by bdantas (2014-12-09 12:31:55)

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PLAN_TABLE_OUTPUT
Plan hash value: 665032407
| Id | Operation                        | Name                    | Rows | Bytes | Cost (%CPU)| Time    |
| 0 | SELECT STATEMENT                |                          | 5995 | 3986K| 3117 (1)| 00:00:38 |
|* 1 | HASH JOIN                      |                          | 5995 | 3986K| 3117 (1)| 00:00:38 |
| 2 | NESTED LOOPS                  |                          | 611 | 47658 |    20 (5)| 00:00:01 |
|* 3 |    VIEW                          | index$_join$_002        | 2290 | 165K|    20 (5)| 00:00:01 |
|* 4 |    HASH JOIN                    |                          |      |      |            |      |
|* 5 |      HASH JOIN                  |                          |      |      |            |      |
PLAN_TABLE_OUTPUT
| 6 |      BITMAP CONVERSION TO ROWIDS|                          | 2290 | 165K|    1 (0)| 00:00:01 |
|* 7 |        BITMAP INDEX SINGLE VALUE | IDX_IS_DELETED_RAM      |      |      |            |      |
| 8 |      INDEX FAST FULL SCAN      | IDX_BUID_RAM            | 2290 | 165K|    8 (0)| 00:00:01 |
| 9 |      INDEX FAST FULL SCAN        | IDX_FAX_NUMBER_RAM      | 2290 | 165K|    14 (0)| 00:00:01 |
|* 10 |    INDEX RANGE SCAN              | GLOBAL_BU_MAPPING_BUID |    1 |    4 |    0 (0)| 00:00:01 |
| 11 | TABLE ACCESS BY INDEX ROWID    | FAX_STAGE                | 23245 |    13M| 3096 (1)| 00:00:38 |
|* 12 |    INDEX RANGE SCAN              | IDX_UPPER_FAX_STATUS_RAM | 9298 |      | 2434 (1)| 00:00:30 |
Predicate Information (identified by operation id):
PLAN_TABLE_OUTPUT
1 - access(UPPER("DESTINATION")="FSRC"."SYS_NC00035$")
3 - filter("FSRC"."IS_DELETED"='N')
4 - access(ROWID=ROWID)
5 - access(ROWID=ROWID)
7 - access("FSRC"."IS_DELETED"='N')
10 - access("GBM"."BU_ID"="FSRC"."BUID")
      filter("GBM"."BU_ID" IS NOT NULL)
12 - access(UPPER("FAX_STATUS")=SYS_OP_C2C(:B1))
31 rows selected
Please confirm on the DBA comment.Is this bitmap index locks rows in my case.
Thanks.>

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