Distance measure using ultra sonic sensor:::timming problem

hi
i found  a problem during making a distance measure system
the timming diagram of the ultrasoinc type SRF05 below
the problem as flow
after i send at leat 10 us
what will happen and when to start capture value from output???100 us or 25 us what is mean
i read this this VI https://decibel.ni.com/content/docs/DOC-3737  and he said::
 """after send 10 us we Wait for falling edge of Output echo or timeout after 18ms""
best ragards
hi ?Q>

GerdW wrote:
Hi mangood,
1) read the manual of the sensor.
2) Read the manual of your DAQ device.
3) Combine the given error ratios by error propagation rules.
When you don't know how to apply point 3 you should read some basic books on "Measurement theory" - or consult Wikipedia...
thank you,i know these ponits
but you know some time practicatl result diffrent in some how from data sheat
so maybe some one work on it and see some error and i need how much  happen
best regards
hi ?Q>

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    Haswell ULT Desktop (GT1), Haswell ULT Desktop (GT2),
    Iris(TM) Graphics 5100, HD Graphics, HD Graphics 4400,
    HD Graphics 5000, Haswell ULT Server (GT1), Haswell ULT Server (GT2),
    Iris(TM) Graphics 5100, Haswell ULT (GT1), Haswell ULT (GT2),
    Iris(TM) Graphics 5100, HD Graphics, HD Graphics 4200,
    Iris(TM) Graphics 5100, Haswell CRW Desktop (GT1), HD Graphics 4600,
    Iris(TM) Pro Graphics 5200, Haswell CRW Mobile (GT1),
    HD Graphics 4600, Iris(TM) Pro Graphics 5200,
    Haswell CRW Server (GT1), Haswell CRW Server (GT2),
    Iris(TM) Pro Graphics 5200, Haswell CRW (GT1), Haswell CRW (GT2),
    Iris(TM) Pro Graphics 5200, Haswell CRW (GT1), Haswell CRW (GT2),
    Iris(TM) Pro Graphics 5200, ValleyView PO board
    [ 7.594] (II) VESA: driver for VESA chipsets: vesa
    [ 7.594] (++) using VT number 1
    [ 7.594] (WW) Falling back to old probe method for vesa
    [ 7.594] (II) intel(0): Creating default Display subsection in Screen section
    "Default Screen Section" for depth/fbbpp 24/32
    [ 7.594] (==) intel(0): Depth 24, (--) framebuffer bpp 32
    [ 7.594] (==) intel(0): RGB weight 888
    [ 7.594] (==) intel(0): Default visual is TrueColor
    [ 7.594] (--) intel(0): Integrated Graphics Chipset: Intel(R) Ivybridge Mobile (GT2)
    [ 7.594] (**) intel(0): Relaxed fencing enabled
    [ 7.594] (**) intel(0): Wait on SwapBuffers? enabled
    [ 7.594] (**) intel(0): Triple buffering? enabled
    [ 7.594] (**) intel(0): Framebuffer tiled
    [ 7.594] (**) intel(0): Pixmaps tiled
    [ 7.594] (**) intel(0): 3D buffers tiled
    [ 7.594] (**) intel(0): SwapBuffers wait enabled
    [ 7.594] (==) intel(0): video overlay key set to 0x101fe
    [ 7.594] (II) intel(0): Output eDP1 has no monitor section
    [ 7.595] (--) intel(0): found backlight control interface /sys/class/backlight/acpi_video1
    [ 7.596] (II) intel(0): Output VGA1 has no monitor section
    [ 7.596] (II) intel(0): EDID for output eDP1
    [ 7.596] (II) intel(0): Manufacturer: LGD Model: 323 Serial#: 0
    [ 7.596] (II) intel(0): Year: 2012 Week: 0
    [ 7.596] (II) intel(0): EDID Version: 1.4
    [ 7.596] (II) intel(0): Digital Display Input
    [ 7.596] (II) intel(0): 6 bits per channel
    [ 7.596] (II) intel(0): Digital interface is DisplayPort
    [ 7.596] (II) intel(0): Max Image Size [cm]: horiz.: 35 vert.: 19
    [ 7.596] (II) intel(0): Gamma: 2.20
    [ 7.596] (II) intel(0): No DPMS capabilities specified
    [ 7.596] (II) intel(0): Supported color encodings: RGB 4:4:4 YCrCb 4:4:4
    [ 7.596] (II) intel(0): First detailed timing is preferred mode
    [ 7.596] (II) intel(0): Preferred mode is native pixel format and refresh rate
    [ 7.596] (II) intel(0): redX: 0.629 redY: 0.350 greenX: 0.349 greenY: 0.614
    [ 7.596] (II) intel(0): blueX: 0.154 blueY: 0.112 whiteX: 0.313 whiteY: 0.329
    [ 7.596] (II) intel(0): Manufacturer's mask: 0
    [ 7.596] (II) intel(0): Supported detailed timing:
    [ 7.596] (II) intel(0): clock: 138.0 MHz Image Size: 345 x 194 mm
    [ 7.596] (II) intel(0): h_active: 1920 h_sync: 1952 h_sync_end 1988 h_blank_end 2088 h_border: 0
    [ 7.596] (II) intel(0): v_active: 1080 v_sync: 1085 v_sync_end 1090 v_blanking: 1102 v_border: 0
    [ 7.596] (II) intel(0): LG Display
    [ 7.596] (II) intel(0): LP156WF4-SPB1
    [ 7.596] (II) intel(0): EDID (in hex):
    [ 7.596] (II) intel(0): 00ffffffffffff0030e4230300000000
    [ 7.596] (II) intel(0): 00160104952313780a25b5a159599d27
    [ 7.596] (II) intel(0): 1c505400000001010101010101010101
    [ 7.596] (II) intel(0): 010101010101e83580a8703816402024
    [ 7.596] (II) intel(0): 550059c2100000180000000000000000
    [ 7.596] (II) intel(0): 00000000000000000000000000fe004c
    [ 7.596] (II) intel(0): 4720446973706c61790a2020000000fe
    [ 7.596] (II) intel(0): 004c503135365746342d535042310069
    [ 7.596] (II) intel(0): Not using default mode "320x240" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Not using default mode "400x300" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Not using default mode "400x300" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Not using default mode "512x384" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Not using default mode "640x480" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Not using default mode "640x512" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Not using default mode "800x600" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Not using default mode "896x672" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Not using default mode "928x696" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Not using default mode "960x720" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Not using default mode "700x525" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Not using default mode "1024x768" (doublescan mode not supported)
    [ 7.597] (II) intel(0): Printing probed modes for output eDP1
    [ 7.597] (II) intel(0): Modeline "1920x1080"x60.0 138.00 1920 1952 1988 2088 1080 1085 1090 1102 -hsync -vsync (66.1 kHz eP)
    [ 7.597] (II) intel(0): Modeline "1400x1050"x60.0 122.00 1400 1488 1640 1880 1050 1052 1064 1082 +hsync +vsync (64.9 kHz d)
    [ 7.597] (II) intel(0): Modeline "1280x1024"x60.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz d)
    [ 7.597] (II) intel(0): Modeline "1280x960"x60.0 108.00 1280 1376 1488 1800 960 961 964 1000 +hsync +vsync (60.0 kHz d)
    [ 7.597] (II) intel(0): Modeline "1024x768"x60.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz d)
    [ 7.597] (II) intel(0): Modeline "800x600"x60.3 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz d)
    [ 7.597] (II) intel(0): Modeline "800x600"x56.2 36.00 800 824 896 1024 600 601 603 625 +hsync +vsync (35.2 kHz d)
    [ 7.597] (II) intel(0): Modeline "640x480"x59.9 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz d)
    [ 7.598] (II) intel(0): EDID for output VGA1
    [ 7.598] (II) intel(0): Output eDP1 connected
    [ 7.598] (II) intel(0): Output VGA1 disconnected
    [ 7.598] (II) intel(0): Using exact sizes for initial modes
    [ 7.598] (II) intel(0): Output eDP1 using initial mode 1920x1080
    [ 7.598] (II) intel(0): Using default gamma of (1.0, 1.0, 1.0) unless otherwise stated.
    [ 7.598] (II) intel(0): Kernel page flipping support detected, enabling
    [ 7.598] (==) intel(0): DPI set to (96, 96)
    [ 7.598] (II) Loading sub module "fb"
    [ 7.598] (II) LoadModule: "fb"
    [ 7.598] (II) Loading /usr/lib/xorg/modules/libfb.so
    [ 7.599] (II) Module fb: vendor="X.Org Foundation"
    [ 7.599] compiled for 1.14.2, module version = 1.0.0
    [ 7.599] ABI class: X.Org ANSI C Emulation, version 0.4
    [ 7.599] (II) Loading sub module "dri2"
    [ 7.599] (II) LoadModule: "dri2"
    [ 7.599] (II) Module "dri2" already built-in
    [ 7.599] (II) UnloadModule: "vesa"
    [ 7.599] (II) Unloading vesa
    [ 7.599] (==) Depth 24 pixmap format is 32 bpp
    [ 7.599] (II) intel(0): [DRI2] Setup complete
    [ 7.599] (II) intel(0): [DRI2] DRI driver: i965
    [ 7.599] (II) intel(0): Allocated new frame buffer 1920x1080 stride 7680, tiled
    [ 7.599] (II) UXA(0): Driver registered support for the following operations:
    [ 7.599] (II) solid
    [ 7.599] (II) copy
    [ 7.599] (II) composite (RENDER acceleration)
    [ 7.599] (II) put_image
    [ 7.599] (II) get_image
    [ 7.599] (==) intel(0): Backing store disabled
    [ 7.599] (==) intel(0): Silken mouse enabled
    [ 7.600] (II) intel(0): Initializing HW Cursor
    [ 7.600] (II) intel(0): RandR 1.2 enabled, ignore the following RandR disabled message.
    [ 7.600] (==) intel(0): DPMS enabled
    [ 7.600] (==) intel(0): Intel XvMC decoder enabled
    [ 7.600] (II) intel(0): Set up textured video
    [ 7.600] (II) intel(0): [XvMC] xvmc_vld driver initialized.
    [ 7.600] (II) intel(0): direct rendering: DRI2 Enabled
    [ 7.600] (==) intel(0): hotplug detection: "enabled"
    [ 7.613] (--) RandR disabled
    [ 7.634] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
    [ 7.634] (II) AIGLX: enabled GLX_INTEL_swap_event
    [ 7.634] (II) AIGLX: enabled GLX_ARB_create_context
    [ 7.634] (II) AIGLX: enabled GLX_ARB_create_context_profile
    [ 7.634] (II) AIGLX: enabled GLX_EXT_create_context_es2_profile
    [ 7.634] (II) AIGLX: enabled GLX_SGI_swap_control and GLX_MESA_swap_control
    [ 7.634] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects
    [ 7.634] (II) AIGLX: Loaded and initialized i965
    [ 7.634] (II) GLX: Initialized DRI2 GL provider for screen 0
    [ 7.634] (II) intel(0): Setting screen physical size to 508 x 285
    [ 7.669] (II) config/udev: Adding input device Video Bus (/dev/input/event9)
    [ 7.669] (**) Video Bus: Applying InputClass "evdev keyboard catchall"
    [ 7.669] (II) LoadModule: "evdev"
    [ 7.669] (II) Loading /usr/lib/xorg/modules/input/evdev_drv.so
    [ 7.670] (II) Module evdev: vendor="X.Org Foundation"
    [ 7.670] compiled for 1.14.2, module version = 2.8.1
    [ 7.670] Module class: X.Org XInput Driver
    [ 7.670] ABI class: X.Org XInput driver, version 19.1
    [ 7.670] (II) Using input driver 'evdev' for 'Video Bus'
    [ 7.670] (**) Video Bus: always reports core events
    [ 7.670] (**) evdev: Video Bus: Device: "/dev/input/event9"
    [ 7.670] (--) evdev: Video Bus: Vendor 0 Product 0x6
    [ 7.670] (--) evdev: Video Bus: Found keys
    [ 7.670] (II) evdev: Video Bus: Configuring as keyboard
    [ 7.670] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:01/input/input10/event9"
    [ 7.670] (II) XINPUT: Adding extended input device "Video Bus" (type: KEYBOARD, id 6)
    [ 7.670] (**) Option "xkb_rules" "evdev"
    [ 7.670] (**) Option "xkb_model" "pc104"
    [ 7.670] (**) Option "xkb_layout" "us"
    [ 7.684] (II) config/udev: Adding input device Video Bus (/dev/input/event8)
    [ 7.684] (**) Video Bus: Applying InputClass "evdev keyboard catchall"
    [ 7.684] (II) Using input driver 'evdev' for 'Video Bus'
    [ 7.684] (**) Video Bus: always reports core events
    [ 7.684] (**) evdev: Video Bus: Device: "/dev/input/event8"
    [ 7.684] (--) evdev: Video Bus: Vendor 0 Product 0x6
    [ 7.684] (--) evdev: Video Bus: Found keys
    [ 7.684] (II) evdev: Video Bus: Configuring as keyboard
    [ 7.684] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:03/LNXVIDEO:00/input/input9/event8"
    [ 7.684] (II) XINPUT: Adding extended input device "Video Bus" (type: KEYBOARD, id 7)
    [ 7.684] (**) Option "xkb_rules" "evdev"
    [ 7.684] (**) Option "xkb_model" "pc104"
    [ 7.684] (**) Option "xkb_layout" "us"
    [ 7.684] (II) config/udev: Adding input device Power Button (/dev/input/event2)
    [ 7.685] (**) Power Button: Applying InputClass "evdev keyboard catchall"
    [ 7.685] (II) Using input driver 'evdev' for 'Power Button'
    [ 7.685] (**) Power Button: always reports core events
    [ 7.685] (**) evdev: Power Button: Device: "/dev/input/event2"
    [ 7.685] (--) evdev: Power Button: Vendor 0 Product 0x1
    [ 7.685] (--) evdev: Power Button: Found keys
    [ 7.685] (II) evdev: Power Button: Configuring as keyboard
    [ 7.685] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/device:00/PNP0C0C:00/input/input2/event2"
    [ 7.685] (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 8)
    [ 7.685] (**) Option "xkb_rules" "evdev"
    [ 7.685] (**) Option "xkb_model" "pc104"
    [ 7.685] (**) Option "xkb_layout" "us"
    [ 7.685] (II) config/udev: Adding input device Lid Switch (/dev/input/event1)
    [ 7.685] (II) No input driver specified, ignoring this device.
    [ 7.685] (II) This device may have been added with another device file.
    [ 7.685] (II) config/udev: Adding input device Sleep Button (/dev/input/event3)
    [ 7.685] (**) Sleep Button: Applying InputClass "evdev keyboard catchall"
    [ 7.685] (II) Using input driver 'evdev' for 'Sleep Button'
    [ 7.685] (**) Sleep Button: always reports core events
    [ 7.685] (**) evdev: Sleep Button: Device: "/dev/input/event3"
    [ 7.685] (--) evdev: Sleep Button: Vendor 0 Product 0x3
    [ 7.685] (--) evdev: Sleep Button: Found keys
    [ 7.685] (II) evdev: Sleep Button: Configuring as keyboard
    [ 7.685] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/device:00/PNP0C0E:00/input/input3/event3"
    [ 7.685] (II) XINPUT: Adding extended input device "Sleep Button" (type: KEYBOARD, id 9)
    [ 7.685] (**) Option "xkb_rules" "evdev"
    [ 7.685] (**) Option "xkb_model" "pc104"
    [ 7.685] (**) Option "xkb_layout" "us"
    [ 7.685] (II) config/udev: Adding drm device (/dev/dri/card1)
    [ 7.685] (II) config/udev: Adding drm device (/dev/dri/card0)
    [ 7.686] (II) config/udev: Adding input device USB2.0 HD UVC WebCam (/dev/input/event6)
    [ 7.686] (**) USB2.0 HD UVC WebCam: Applying InputClass "evdev keyboard catchall"
    [ 7.686] (II) Using input driver 'evdev' for 'USB2.0 HD UVC WebCam'
    [ 7.686] (**) USB2.0 HD UVC WebCam: always reports core events
    [ 7.686] (**) evdev: USB2.0 HD UVC WebCam: Device: "/dev/input/event6"
    [ 7.686] (--) evdev: USB2.0 HD UVC WebCam: Vendor 0x4f2 Product 0xb36e
    [ 7.686] (--) evdev: USB2.0 HD UVC WebCam: Found keys
    [ 7.686] (II) evdev: USB2.0 HD UVC WebCam: Configuring as keyboard
    [ 7.686] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.3/3-1.3:1.0/input/input6/event6"
    [ 7.686] (II) XINPUT: Adding extended input device "USB2.0 HD UVC WebCam" (type: KEYBOARD, id 10)
    [ 7.686] (**) Option "xkb_rules" "evdev"
    [ 7.686] (**) Option "xkb_model" "pc104"
    [ 7.686] (**) Option "xkb_layout" "us"
    [ 7.686] (II) config/udev: Adding input device HDA Intel PCH Headphone (/dev/input/event5)
    [ 7.686] (II) No input driver specified, ignoring this device.
    [ 7.686] (II) This device may have been added with another device file.
    [ 7.686] (II) config/udev: Adding input device AT Translated Set 2 keyboard (/dev/input/event0)
    [ 7.686] (**) AT Translated Set 2 keyboard: Applying InputClass "evdev keyboard catchall"
    [ 7.686] (II) Using input driver 'evdev' for 'AT Translated Set 2 keyboard'
    [ 7.686] (**) AT Translated Set 2 keyboard: always reports core events
    [ 7.686] (**) evdev: AT Translated Set 2 keyboard: Device: "/dev/input/event0"
    [ 7.686] (--) evdev: AT Translated Set 2 keyboard: Vendor 0x1 Product 0x1
    [ 7.686] (--) evdev: AT Translated Set 2 keyboard: Found keys
    [ 7.686] (II) evdev: AT Translated Set 2 keyboard: Configuring as keyboard
    [ 7.686] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio0/input/input0/event0"
    [ 7.686] (II) XINPUT: Adding extended input device "AT Translated Set 2 keyboard" (type: KEYBOARD, id 11)
    [ 7.686] (**) Option "xkb_rules" "evdev"
    [ 7.686] (**) Option "xkb_model" "pc104"
    [ 7.686] (**) Option "xkb_layout" "us"
    [ 7.686] (II) config/udev: Adding input device ETPS/2 Elantech Touchpad (/dev/input/event7)
    [ 7.686] (**) ETPS/2 Elantech Touchpad: Applying InputClass "evdev touchpad catchall"
    [ 7.686] (**) ETPS/2 Elantech Touchpad: Applying InputClass "touchpad catchall"
    [ 7.687] (**) ETPS/2 Elantech Touchpad: Applying InputClass "Default clickpad buttons"
    [ 7.687] (II) LoadModule: "synaptics"
    [ 7.687] (II) Loading /usr/lib/xorg/modules/input/synaptics_drv.so
    [ 7.687] (II) Module synaptics: vendor="X.Org Foundation"
    [ 7.687] compiled for 1.14.1, module version = 1.7.1
    [ 7.687] Module class: X.Org XInput Driver
    [ 7.687] ABI class: X.Org XInput driver, version 19.1
    [ 7.687] (II) Using input driver 'synaptics' for 'ETPS/2 Elantech Touchpad'
    [ 7.687] (**) ETPS/2 Elantech Touchpad: always reports core events
    [ 7.687] (**) Option "Device" "/dev/input/event7"
    [ 7.810] (II) synaptics: ETPS/2 Elantech Touchpad: found clickpad property
    [ 7.810] (--) synaptics: ETPS/2 Elantech Touchpad: x-axis range 0 - 3260 (res 32)
    [ 7.810] (--) synaptics: ETPS/2 Elantech Touchpad: y-axis range 0 - 2119 (res 32)
    [ 7.810] (--) synaptics: ETPS/2 Elantech Touchpad: pressure range 0 - 255
    [ 7.810] (--) synaptics: ETPS/2 Elantech Touchpad: finger width range 0 - 15
    [ 7.810] (--) synaptics: ETPS/2 Elantech Touchpad: buttons: left double triple
    [ 7.810] (--) synaptics: ETPS/2 Elantech Touchpad: Vendor 0x2 Product 0xe
    [ 7.810] (**) Option "TapButton1" "1"
    [ 7.810] (**) Option "TapButton2" "2"
    [ 7.810] (**) Option "TapButton3" "3"
    [ 7.810] (**) Option "SoftButtonAreas" "50% 0 82% 0 0 0 0 0"
    [ 7.810] (--) synaptics: ETPS/2 Elantech Touchpad: touchpad found
    [ 7.810] (**) ETPS/2 Elantech Touchpad: always reports core events
    [ 7.853] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio4/input/input8/event7"
    [ 7.853] (II) XINPUT: Adding extended input device "ETPS/2 Elantech Touchpad" (type: TOUCHPAD, id 12)
    [ 7.853] (**) synaptics: ETPS/2 Elantech Touchpad: (accel) MinSpeed is now constant deceleration 2.5
    [ 7.853] (**) synaptics: ETPS/2 Elantech Touchpad: (accel) MaxSpeed is now 1.75
    [ 7.853] (**) synaptics: ETPS/2 Elantech Touchpad: (accel) AccelFactor is now 0.051
    [ 7.853] (**) ETPS/2 Elantech Touchpad: (accel) keeping acceleration scheme 1
    [ 7.853] (**) ETPS/2 Elantech Touchpad: (accel) acceleration profile 1
    [ 7.853] (**) ETPS/2 Elantech Touchpad: (accel) acceleration factor: 2.000
    [ 7.853] (**) ETPS/2 Elantech Touchpad: (accel) acceleration threshold: 4
    [ 7.853] (--) synaptics: ETPS/2 Elantech Touchpad: touchpad found
    [ 7.853] (II) config/udev: Adding input device ETPS/2 Elantech Touchpad (/dev/input/mouse0)
    [ 7.853] (**) ETPS/2 Elantech Touchpad: Ignoring device from InputClass "touchpad ignore duplicates"
    [ 7.853] (II) config/udev: Adding input device PC Speaker (/dev/input/event4)
    [ 7.853] (II) No input driver specified, ignoring this device.
    [ 7.853] (II) This device may have been added with another device file.
    Found this recent thread in the forums, I'll give REISUB a try late, but the times it freezed I remember trying to blindly reboot it, or switching off virtual console and couldn't.
    In case it's of any use, this is my # uname -a
    Linux arch 3.10.3-1-ARCH #1 SMP PREEMPT Fri Jul 26 11:26:59 CEST 2013 x86_64 GNU/Linux
    Could it have something to do with the nvidia optimus setup that this laptop has? When installing arch I found out that there was no support yet for it so I'm just using the intel drivers (following what the arch wiki said).
    Any ideas or advice to point me in the right direction would be very much appreciated.
    Thanks in advance.
    Last edited by contiver (2013-08-16 20:25:34)

    I don't start st in my .xinitrc. I launch it from dmenu and usually everything is fine. If I launch it from dwm's internal command using Alt-Shf-Return, X freezes 100% of the time. A workaround was suggested by st's main developer to call st like this:
    static const char *termcmd[] = { "/bin/sh", "-c", "st", NULL };
    but it didn't work for me.
    Very rarely X will freeze anyway. I haven't been able to pin it down. When X fails, my journal returns this:
    BUG: unable to handle kernel paging request at ffffc90014ce8000
    IP: [<ffffffff812bfe7f>] bitfill_aligned+0x8f/0x140
    PGD 7c00b067 PUD 7c018067 PMD 7b3eb067 PTE 0
    Oops: 0002 [#1] PREEMPT SMP
    Modules linked in: nls_cp437 vfat fat snd_usb_audio snd_usbmidi_lib snd_hwdep snd_rawmidi snd_seq_device snd_pcm snd_page_alloc snd_timer
    CPU: 1 PID: 7520 Comm: X Not tainted 3.10.5-1-ck #1
    Hardware name: /D410PT, BIOS MOPNV10N.86A.0155.2009.1106.0430 11/06/2009
    task: ffff88007aa786b0 ti: ffff8800797ee000 task.ti: ffff8800797ee000
    RIP: 0010:[<ffffffff812bfe7f>] [<ffffffff812bfe7f>] bitfill_aligned+0x8f/0x140
    RSP: 0018:ffff8800797efaa8 EFLAGS: 00010212
    RAX: 0000000003ffff5c RBX: 0000000000000000 RCX: 0000000000000000
    RDX: 0000000003ffff5c RSI: ffffc90014901520 RDI: ffffc90014ce7fe0
    RBP: ffff8800797efab8 R08: 00000000ffffd700 R09: 0000000003f83204
    R10: 0000000000000000 R11: ffffc90014ce7fd8 R12: ffffffffffffffff
    R13: ffffc90014901520 R14: ffffffff812bfdf0 R15: 0000000000000320
    FS: 00007fb350033880(0000) GS:ffff88007ea80000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: ffffc90014ce8000 CR3: 000000007b104000 CR4: 00000000000007e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Stack:
    0000000000000000 ffff88007a4d3000 ffff8800797efb28 ffffffff812bfbb9
    ffffffff00000000 ffff88007c00c000 0000000000000000 ffffffff8186f240
    0000000000000000 ffffffff00000006 ffffd700797efb58 ffff88007a4d3000
    Call Trace:
    [<ffffffff812bfbb9>] cfb_fillrect+0x1c9/0x400
    [<ffffffff812ba2e5>] bit_clear_margins+0x165/0x190
    [<ffffffff812b3633>] fbcon_clear_margins+0x63/0x90
    [<ffffffff812b7a9f>] fbcon_switch+0x3df/0x570
    [<ffffffff813200bd>] redraw_screen+0x17d/0x240
    [<ffffffff812b6eeb>] fbcon_blank+0x20b/0x2d0
    [<ffffffff81320767>] do_unblank_screen+0xa7/0x1b0
    [<ffffffff813175d1>] vt_ioctl+0x10d1/0x1170
    [<ffffffff8130b407>] tty_ioctl+0x277/0xb90
    [<ffffffff8118fb21>] ? mntput_no_expire+0x41/0x150
    [<ffffffff81183a3e>] do_vfs_ioctl+0x2de/0x4c0
    [<ffffffff8117328e>] ? ____fput+0xe/0x10
    [<ffffffff8107766c>] ? task_work_run+0x9c/0xe0
    [<ffffffff81183ca3>] SyS_ioctl+0x83/0xa0
    [<ffffffff814bab9d>] system_call_fastpath+0x1a/0x1f
    Code: 08 45 01 d8 31 d2 44 89 c0 41 f7 f1 83 f8 07 89 c2 76 4f 44 8d 08 48 8d 3e 0f 1f 00 4c 89 17 4c 89 57 08 4c 89 57 10 4c 89 57 18 <4
    RIP [<ffffffff812bfe7f>] bitfill_aligned+0x8f/0x140
    RSP <ffff8800797efaa8>
    CR2: ffffc90014ce8000
    ---[ end trace aff6cb5ad5097aef ]---

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