root@beagle1:~# echo 1 > /sys/devices/platform/omapfb/graphics/fb0/blank
root@beagle1:~# sudo reboot

Broadcast message from ubuntu@beagle1
        (/dev/ttyS2) at 19:56 ...

The system is going down for reboot NOW!
root@beagle1:~# [  209.553375] kernel BUG at /opt/git/Ubuntu/roc/ubuntu-lucid/drivers/video/omap2/dss/core.c:323!
[  209.566864] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[  209.579620] pgd = cfbe4000
[  209.586853] [00000000] *pgd=00000000
[  209.595001] Internal error: Oops: 805 [#1]
[  209.603576] last sysfs file: /sys/devices/platform/soc-audio/sound/card0/uevent
[  209.615509] Modules linked in: nls_iso8859_1 nls_cp437 binfmt_misc omap_wdt leds_gpio
[  209.628143] CPU: 0    Not tainted  (2.6.33-502-omap #10~lp588243)
[  209.638977] PC is at __bug+0x1c/0x24
[  209.647247] LR is at __bug+0x18/0x24
[  209.655426] pc : [<c0038a50>]    lr : [<c0038a4c>]    psr: 60000013
[  209.655456] sp : cf985e20  ip : 00000000  fp : 00000000
[  209.676330] r10: 00000000  r9 : cf984000  r8 : c0034be8
[  209.686218] r7 : c02a33b4  r6 : cf985e48  r5 : 00000000  r4 : 00000003
[  209.697509] r3 : 00000000  r2 : c0628918  r1 : 60000013  r0 : 00000068
[  209.708648] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[  209.720428] Control: 10c5387d  Table: 8fbe4019  DAC: 00000015
[  209.730773] Process reboot (pid: 1183, stack limit = 0xcf9842e8)
[  209.741394] Stack: (0xcf985e20 to 0xcf986000)
[  209.750396] 5e20: 00000002 c029c36c c0620fc8 c02a3260 c0620fc8 c02ae084 00000000 c02a33c4
[  209.763458] 5e40: c02a33b4 c02daca8 cf846a78 cf1a3870 c033f630 c06277a0 c06c8204 01234567
[  209.776550] 5e60: 00000058 c02dc7d4 c02dc7bc c02d7bd8 00000000 c062a068 01234567 c0079d48
[  209.789672] 5e80: 00000000 c0079d80 00000000 c0079f04 cfbe5000 00000000 00000000 c00e3598
[  209.802886] 5ea0: 0000000d 00000000 00000000 000000ed c8b38f98 c1523180 c17ef540 00000004
[  209.816040] 5ec0: 400393fc 00000000 c17ef574 c04934b4 cf985fb0 c17ef540 000000cf cf985fb0
[  209.829193] 5ee0: c17ef540 c04935e0 00000017 cf984000 00000007 c06186cc 400393fc cf985fb0
[  209.842407] 5f00: 00000000 00000000 2a009f3c c0034254 0000000f c006168c 0001ab3f 00000000
[  209.855590] 5f20: cf985f34 c063590c c0618930 c0627d00 ca516fdc 00000030 00007735 00000000
[  209.868865] 5f40: cf985f7c cf984000 c063626c 00000000 00000024 00000000 cf984000 00000000
[  209.882110] 5f60: cf985f74 c006168c cf984000 c0636540 cf985f7c c04900ac 00000001 c1413800
[  209.895263] 5f80: 00000001 c011efc8 2a009f3c 00000000 00000000 2a009f3c 00000000 be964ca8
[  209.908355] 5fa0: 00000058 c0034a40 2a009f3c 00000000 fee1dead 28121969 01234567 00000058
[  209.921386] 5fc0: 2a009f3c 00000000 be964ca8 00000058 00000000 00000000 2a009f3c 00000000
[  209.934356] 5fe0: 2a009f50 be964ca8 2a00128f 400cdc32 00000030 fee1dead 00000000 00000000
[  209.947326] [<c0038a50>] (__bug+0x1c/0x24) from [<c029c36c>] (dss_clk_disable+0x88/0x98)
[  209.960327] [<c029c36c>] (dss_clk_disable+0x88/0x98) from [<c02a3260>] (omapdss_dpi_display_disable+0x20/0x3c)
[  209.975341] [<c02a3260>] (omapdss_dpi_display_disable+0x20/0x3c) from [<c02ae084>] (generic_panel_disable+0xc/0x18)
[  209.990844] [<c02ae084>] (generic_panel_disable+0xc/0x18) from [<c02a33c4>] (dss_disable_device+0x10/0x18)
[  210.005676] [<c02a33c4>] (dss_disable_device+0x10/0x18) from [<c02daca8>] (bus_for_each_dev+0x60/0x8c)
[  210.020294] [<c02daca8>] (bus_for_each_dev+0x60/0x8c) from [<c02dc7d4>] (platform_drv_shutdown+0x18/0x1c)
[  210.035247] [<c02dc7d4>] (platform_drv_shutdown+0x18/0x1c) from [<c02d7bd8>] (device_shutdown+0x88/0xac)
[  210.050201] [<c02d7bd8>] (device_shutdown+0x88/0xac) from [<c0079d48>] (kernel_restart_prepare+0x2c/0x34)
[  210.065307] [<c0079d48>] (kernel_restart_prepare+0x2c/0x34) from [<c0079d80>] (kernel_restart+0xc/0x40)
[  210.080322] [<c0079d80>] (kernel_restart+0xc/0x40) from [<c0079f04>] (sys_reboot+0x148/0x1ec)
[  210.094512] [<c0079f04>] (sys_reboot+0x148/0x1ec) from [<c0034a40>] (ret_fast_syscall+0x0/0x2c)
[  210.108856] Code: e3080388 e34c0056 eb115b75 e3a03000 (e5833000) 
[  210.120513] ---[ end trace 33c95b442ba11115 ]---