I tried running the daemon in verbose mode, but it doesn't output anything during the sporadic blanking.
$ xscreensaver -sync -verbose -no-capture xscreensaver 4.23, copyright (c) 1991-2005 by Jamie Zawinski <[EMAIL PROTECTED]>. xscreensaver: running as lee/lee (1000/1000) xscreensaver: in process 7074. xscreensaver: 21:16:09: running xscreensaver-gl-helper: No such file or directory xscreensaver: 21:16:10: xscreensaver-gl-helper did not report a GL visual! xscreensaver: 21:16:10: running on display ":0.0" (1 screen). xscreensaver: 21:16:10: vendor is The X.Org Foundation, 60802000. xscreensaver: 21:16:10: useful extensions: xscreensaver: 21:16:10: MIT Screen-Saver <-- not supported at compile time! xscreensaver: 21:16:10: Shared Memory xscreensaver: 21:16:10: Double-Buffering xscreensaver: 21:16:10: Power Management xscreensaver: 21:16:10: GLX xscreensaver: 21:16:10: XF86 Video-Mode xscreensaver: 21:16:11: Resize-and-Rotate xscreensaver: 21:16:11: screen 0 non-colormapped depths: 16. xscreensaver: 21:16:11: selecting RANDR events xscreensaver: 21:16:11: 0: visual 0x22 (TrueColor, depth: 16, cmap: default) xscreensaver: 21:16:11: 0: saver window is 0xe00001. xscreensaver: 21:16:11: selecting events on extant windows... done. xscreensaver: 21:16:12: awaiting idleness. xscreensaver: 21:16:50: 0: unrecognised ClientMessage "_NET_ACTIVE_WINDOW" received xscreensaver: 21:16:50: 0: for window 0xc00032 (epiphany / Epiphany) xscreensaver: 21:16:57: 0: unrecognised ClientMessage "_NET_ACTIVE_WINDOW" received xscreensaver: 21:16:57: 0: for window 0x2605def (gnome-terminal / Gnome-terminal) Output of xdpyinfo: name of display: :0.0 version number: 11.0 vendor string: The X.Org Foundation vendor release number: 60802000 X.Org version: 6.8.2 maximum request size: 16777212 bytes motion buffer size: 256 bitmap unit, bit order, padding: 32, LSBFirst, 32 image byte order: LSBFirst number of supported pixmap formats: 7 supported pixmap formats: depth 1, bits_per_pixel 1, scanline_pad 32 depth 4, bits_per_pixel 8, scanline_pad 32 depth 8, bits_per_pixel 8, scanline_pad 32 depth 15, bits_per_pixel 16, scanline_pad 32 depth 16, bits_per_pixel 16, scanline_pad 32 depth 24, bits_per_pixel 32, scanline_pad 32 depth 32, bits_per_pixel 32, scanline_pad 32 keycode range: minimum 8, maximum 255 focus: window 0x2605df0, revert to Parent number of extensions: 31 BIG-REQUESTS DAMAGE DOUBLE-BUFFER DPMS Extended-Visual-Information FontCache GLX LBX MIT-SCREEN-SAVER MIT-SHM MIT-SUNDRY-NONSTANDARD RANDR RECORD RENDER SECURITY SGI-GLX SHAPE SYNC TOG-CUP X-Resource XC-APPGROUP XC-MISC XFIXES XFree86-Bigfont XFree86-DGA XFree86-Misc XFree86-VidModeExtension XInputExtension XKEYBOARD XTEST XVideo default screen number: 0 number of screens: 1 screen #0: print screen: no dimensions: 1024x768 pixels (347x260 millimeters) resolution: 75x75 dots per inch depths (7): 16, 1, 4, 8, 15, 24, 32 root window id: 0x3b depth of root window: 16 planes number of colormaps: minimum 1, maximum 1 default colormap: 0x20 default number of colormap cells: 64 preallocated pixels: black 0, white 65535 options: backing-store NO, save-unders NO largest cursor: 64x64 current input event mask: 0xfa2033 KeyPressMask KeyReleaseMask EnterWindowMask LeaveWindowMask ButtonMotionMask StructureNotifyMask SubstructureNotifyMask SubstructureRedirectMask FocusChangeMask PropertyChangeMask ColormapChangeMask number of visuals: 4 default visual id: 0x22 visual: visual id: 0x22 class: TrueColor depth: 16 planes available colormap entries: 64 per subfield red, green, blue masks: 0xf800, 0x7e0, 0x1f significant bits in color specification: 6 bits visual: visual id: 0x23 class: TrueColor depth: 16 planes available colormap entries: 64 per subfield red, green, blue masks: 0xf800, 0x7e0, 0x1f significant bits in color specification: 6 bits visual: visual id: 0x24 class: TrueColor depth: 16 planes available colormap entries: 64 per subfield red, green, blue masks: 0xf800, 0x7e0, 0x1f significant bits in color specification: 6 bits visual: visual id: 0x25 class: TrueColor depth: 16 planes available colormap entries: 64 per subfield red, green, blue masks: 0xf800, 0x7e0, 0x1f significant bits in color specification: 6 bits -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]