drm_kms_helper: panic occurred, switching back to text conso

The Angstrom Distribution beaglebone ttyO0

Angstrom v2013.06 - Kernel 3.8.13

beaglebone login: t[  240.197678] INFO: task kworker/0:1:15 blocked for more th.
[  240.204625] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.
[  240.212844] Kernel panic - not syncing: hung_task: blocked tasks
[  240.219144] [<c001051d>] (unwind_backtrace+0x1/0x8c) from [<c03739c1>] (pani)
[  240.227692] [<c03739c1>] (panic+0x55/0x14c) from [<c00617b3>] (watchdog+0x15)
[  240.235781] [<c00617b3>] (watchdog+0x153/0x1a0) from [<c003ca4b>] (kthread+0)
[  240.243962] [<c003ca4b>] (kthread+0x61/0x72) from [<c000c6fd>] (ret_from_for)
[  240.252404] drm_kms_helper: panic occurred, switching back to text console
[  240.259576] [drm:drm_crtc_helper_set_config],
[  240.264205] [drm:drm_crtc_helper_set_config], [CRTC:3] [FB:8] #connectors=1 )
[  240.272767] [drm:drm_crtc_helper_set_config], [CONNECTOR:5:LVDS-1] to [CRTC:]