lp:~liuyq0307/lava-dispatcher/disable-suspend-new  branch can decrease the rate of this problem,
but it seem not works 100%,

 IMO, we need to check it more deeply. 

and below is the output information from conmux-console on my local machine about the suspend and ip disconnect
---------------------------------------------------------------------------

[ 4707.146118] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
[ 4707.519592] PM: suspend of devices complete after 296.844 msecs
[ 4707.565307] PM: late suspend of devices complete after 16.571 msecs
[ 4707.594299] Disabling non-boot CPUs ...
[ 4707.622161] CPU1: shutdown
[ 4813.349182] Suspended for 105.700 seconds
[ 4813.375793] wakeup wake lock: alarm
[ 4813.401855] Enabling non-boot CPUs ...
[ 4813.470458] CPU1: Booted secondary processor
[ 4813.470458] CPU1: Unknown IPI message 0x1
[ 4813.470550] Calibrating delay loop (skipped) already calibrated this CPU
[ 4813.484558] Switched to NOHz mode on CPU #1
[ 4813.581451] thermal_cooling_dev_register:Found cpu cpu
[ 4813.581451] thermal_init_thermal_state:Not all components registered for cpu domain sensor   (null), gov=ef9089a0, cooling=c08bcfcc
[ 4813.581451] CPU1 is up
[ 4813.964141] ------------[ cut here ]------------
[ 4813.975830] WARNING: at /mnt/jenkins/workspace/linaro-android_staging-panda/build/kernel/drivers/video/omap2/dss/dss.c:716 dss_runtime_get+0x34/0x40()
[ 4813.975891] Modules linked in: wl12xx wl1273_core gator btwilink rfcomm hci_uart bnep bluetooth st_drv
[ 4814.014007] [<c0019874>] (unwind_backtrace+0x0/0xf8) from [<c004b850>] (warn_slowpath_common+0x4c/0x64)
[ 4814.031036] [<c004b850>] (warn_slowpath_common+0x4c/0x64) from [<c004b884>] (warn_slowpath_null+0x1c/0x24)
[ 4814.031036] [<c004b884>] (warn_slowpath_null+0x1c/0x24) from [<c031759c>] (dss_runtime_get+0x34/0x40)
[ 4814.065185] [<c031759c>] (dss_runtime_get+0x34/0x40) from [<c0317e24>] (dispc_runtime_resume+0x8/0x1340)
[ 4814.082427] [<c0317e24>] (dispc_runtime_resume+0x8/0x1340) from [<c038c2e8>] (pm_generic_runtime_resume+0x2c/0x40)
[ 4814.100555] [<c038c2e8>] (pm_generic_runtime_resume+0x2c/0x40) from [<c00353e0>] (_od_resume_noirq+0x40/0x4c)
[ 4814.118286] [<c00353e0>] (_od_resume_noirq+0x40/0x4c) from [<c038d054>] (pm_noirq_op+0x98/0x160)
[ 4814.134857] [<c038d054>] (pm_noirq_op+0x98/0x160) from [<c038d164>] (dpm_resume_noirq+0x48/0x144)
[ 4814.151519] [<c038d164>] (dpm_resume_noirq+0x48/0x144) from [<c00844f8>] (suspend_devices_and_enter+0x114/0x354)
[ 4814.169616] [<c00844f8>] (suspend_devices_and_enter+0x114/0x354) from [<c0084824>] (enter_state+0xec/0x128)
[ 4814.187255] [<c0084824>] (enter_state+0xec/0x128) from [<c00857c4>] (suspend+0x5c/0x194)
[ 4814.187255] [<c00857c4>] (suspend+0x5c/0x194) from [<c0063ec0>] (process_one_work+0x12c/0x48c)
[ 4814.219512] [<c0063ec0>] (process_one_work+0x12c/0x48c) from [<c0064598>] (worker_thread+0x17c/0x37c)
[ 4814.236511] [<c0064598>] (worker_thread+0x17c/0x37c) from [<c00689c0>] (kthread+0x80/0x88)
[ 4814.236511] [<c00689c0>] (kthread+0x80/0x88) from [<c0013e50>] (kernel_thread_exit+0x0/0x8)
[ 4814.236511] ---[ end trace 46af755aa476bada ]---
[ 4814.280609] ------------[ cut here ]------------
[ 4814.292663] WARNING: at /mnt/jenkins/workspace/linaro-android_staging-panda/build/kernel/drivers/video/omap2/dss/dss.c:716 dss_runtime_get+0x34/0x40()
[ 4814.314147] Modules linked in: wl12xx wl1273_core gator btwilink rfcomm hci_uart bnep bluetooth st_drv
[ 4814.331359] [<c0019874>] (unwind_backtrace+0x0/0xf8) from [<c004b850>] (warn_slowpath_common+0x4c/0x64)
[ 4814.331359] [<c004b850>] (warn_slowpath_common+0x4c/0x64) from [<c004b884>] (warn_slowpath_null+0x1c/0x24)
[ 4814.365997] [<c004b884>] (warn_slowpath_null+0x1c/0x24) from [<c031759c>] (dss_runtime_get+0x34/0x40)
[ 4814.366027] [<c031759c>] (dss_runtime_get+0x34/0x40) from [<c032ab78>] (hdmi_runtime_resume+0x8/0x44)
[ 4814.400024] [<c032ab78>] (hdmi_runtime_resume+0x8/0x44) from [<c038c2e8>] (pm_generic_runtime_resume+0x2c/0x40)
[ 4814.417968] [<c038c2e8>] (pm_generic_runtime_resume+0x2c/0x40) from [<c00353e0>] (_od_resume_noirq+0x40/0x4c)
[ 4814.417968] [<c00353e0>] (_od_resume_noirq+0x40/0x4c) from [<c038d054>] (pm_noirq_op+0x98/0x160)
[ 4814.452301] [<c038d054>] (pm_noirq_op+0x98/0x160) from [<c038d164>] (dpm_resume_noirq+0x48/0x144)
[ 4814.468963] [<c038d164>] (dpm_resume_noirq+0x48/0x144) from [<c00844f8>] (suspend_devices_and_enter+0x114/0x354)
[ 4814.487030] [<c00844f8>] (suspend_devices_and_enter+0x114/0x354) from [<c0084824>] (enter_state+0xec/0x128)
[ 4814.504638] [<c0084824>] (enter_state+0xec/0x128) from [<c00857c4>] (suspend+0x5c/0x194)
[ 4814.520477] [<c00857c4>] (suspend+0x5c/0x194) from [<c0063ec0>] (process_one_work+0x12c/0x48c)
[ 4814.536895] [<c0063ec0>] (process_one_work+0x12c/0x48c) from [<c0064598>] (worker_thread+0x17c/0x37c)
[ 4814.554016] [<c0064598>] (worker_thread+0x17c/0x37c) from [<c00689c0>] (kthread+0x80/0x88)
[ 4814.554016] [<c00689c0>] (kthread+0x80/0x88) from [<c0013e50>] (kernel_thread_exit+0x0/0x8)
[ 4814.586334] ---[ end trace 46af755aa476badb ]---
[ 4814.598968] PM: early resume of devices complete after 1017.517 msecs
[ 4815.236602] Trying disable clock dss_sys_clk with 0 usecount
[ 4815.252014] ------------[ cut here ]------------
[ 4815.266265] WARNING: at /mnt/jenkins/workspace/linaro-android_staging-panda/build/kernel/arch/arm/plat-omap/clock.c:70 clk_disable+0x80/0x94()
[ 4815.266265] Modules linked in: wl12xx wl1273_core gator btwilink rfcomm hci_uart bnep bluetooth st_drv
[ 4815.308837] [<c0019874>] (unwind_backtrace+0x0/0xf8) from [<c004b850>] (warn_slowpath_common+0x4c/0x64)
[ 4815.308837] [<c004b850>] (warn_slowpath_common+0x4c/0x64) from [<c004b884>] (warn_slowpath_null+0x1c/0x24)
[ 4815.308837] [<c004b884>] (warn_slowpath_null+0x1c/0x24) from [<c003168c>] (clk_disable+0x80/0x94)
[ 4815.366943] [<c003168c>] (clk_disable+0x80/0x94) from [<c032a75c>] (hdmi_runtime_suspend+0x14/0x24)
[ 4815.366943] [<c032a75c>] (hdmi_runtime_suspend+0x14/0x24) from [<c038c2a8>] (pm_generic_runtime_suspend+0x2c/0x40)
[ 4815.366943] [<c038c2a8>] (pm_generic_runtime_suspend+0x2c/0x40) from [<c0035464>] (_od_runtime_suspend+0xc/0x24)
[ 4815.366943] [<c0035464>] (_od_runtime_suspend+0xc/0x24) from [<c038e894>] (rpm_callback+0x3c/0x6c)
[ 4815.439178] [<c038e894>] (rpm_callback+0x3c/0x6c) from [<c038ed2c>] (rpm_suspend+0x1a0/0x3a8)
[ 4815.439178] [<c038ed2c>] (rpm_suspend+0x1a0/0x3a8) from [<c038fa8c>] (__pm_runtime_suspend+0x5c/0x74)
[ 4815.439178] [<c038fa8c>] (__pm_runtime_suspend+0x5c/0x74) from [<c038c628>] (pm_generic_runtime_idle+0x44/0x4c)
[ 4815.499603] [<c038c628>] (pm_generic_runtime_idle+0x44/0x4c) from [<c038f0a4>] (rpm_idle+0xfc/0x1b8)
[ 4815.522308] [<c038f0a4>] (rpm_idle+0xfc/0x1b8) from [<c038f228>] (__pm_runtime_idle+0x5c/0x74)
[ 4815.522308] [<c038f228>] (__pm_runtime_idle+0x5c/0x74) from [<c038cef4>] (device_resume+0xa4/0x128)
[ 4815.522308] [<c038cef4>] (device_resume+0xa4/0x128) from [<c038d758>] (dpm_resume+0x140/0x198)
[ 4815.578338] [<c038d758>] (dpm_resume+0x140/0x198) from [<c038d90c>] (dpm_resume_end+0xc/0x18)
[ 4815.578338] [<c038d90c>] (dpm_resume_end+0xc/0x18) from [<c0084540>] (suspend_devices_and_enter+0x15c/0x354)
[ 4815.578338] [<c0084540>] (suspend_devices_and_enter+0x15c/0x354) from [<c0084824>] (enter_state+0xec/0x128)
[ 4815.616546] [<c0084824>] (enter_state+0xec/0x128) from [<c00857c4>] (suspend+0x5c/0x194)
[ 4815.616546] [<c00857c4>] (suspend+0x5c/0x194) from [<c0063ec0>] (process_one_work+0x12c/0x48c)
[ 4815.616546] [<c0063ec0>] (process_one_work+0x12c/0x48c) from [<c0064598>] (worker_thread+0x17c/0x37c)
[ 4815.616546] [<c0064598>] (worker_thread+0x17c/0x37c) from [<c00689c0>] (kthread+0x80/0x88)
[ 4815.710021] [<c00689c0>] (kthread+0x80/0x88) from [<c0013e50>] (kernel_thread_exit+0x0/0x8)
[ 4815.710021] ---[ end trace 46af755aa476badc ]---
[ 4815.762176] omap_device: omap2_mcspi.1: new worst case deactivate latency 0: 61035
[ 4816.091339] PM: resume of devices complete after 1477.965 msecs
[ 4816.111145] Restarting tasks ...  done.
[ 4816.142242] suspend: exit suspend, ret = 0 (2012-01-18 08:10:28.296966692 UTC)
[ 4816.172515] PM: Syncing filesystems ... done.
[ 4816.225646] (stc): st_register(4) 
[ 4816.225677] (stc):  chnl_id list empty :4 
[ 4816.225677] (stk) : st_kim_startFreezing user space processes ... 
[ 4816.369171] hub 3-0:1.0: activate --> -22
[ 4816.396636] (stk) :ldisc_install = 1
[ 4817.390625] (stk) :line disc installation timed out 
[ 4817.420227] (stk) :ldisc_install = 0
[ 4818.549774] (stk) :ldisc_install = 1
[ 4819.570159] (stk) :line disc installation timed out 
[ 4819.599334] (stk) :ldisc_install = 0
[ 4820.722625] (stk) :ldisc_install = 1
[ 4821.750213] (stk) :line disc installation timed out 
[ 4821.779022] (stk) :ldisc_install = 0
[ 4822.891143] (stk) :ldisc_install = 1
[ 4823.929534] (stk) :line disc installation timed out 
[ 4823.929534] (stk) :ldisc_install = 0
[ 4825.070953] (stk) :ldisc_install = 1
[ 4826.109222] (stk) :line disc installation timed out 
[ 4826.109222] (stk) :ldisc_install = 0
[ 4827.267181] (stk) :ldisc_install = 1
[ 4828.288909] (stk) :line disc installation timed out 
[ 4828.288909] (stk) :ldisc_install = 0
[ 4829.335754] Bluetooth: st_register failed -22
[ 4829.385101] (elapsed 13.11 seconds) done.
[ 4829.411987] Freezing remaining freezable tasks ... (elapsed 0.02 seconds) done.
[ 4829.795501] PM: suspend of devices complete after 333.129 msecs
[ 4829.828582] omap_device: omap-mcpdm.-1: new worst case deactivate latency 0: 4058837
[ 4829.871520] omap_device: musb-omap2430.-1: new worst case deactivate latency 0: 9307861
[ 4829.902374] PM: late suspend of devices complete after 77.880 msecs
[ 4829.931457] Disabling non-boot CPUs ...
[ 4829.959259] CPU1: shutdown