The screen saver starts and locks the screen shortly after login (usually within four or five seconds), however xscreensaver is configured to start after 10 minutes. I do not know why it starts immediately instead of after 10 minutes has passed. I'm not very familiar with the configuration of xscreensaver and xfce4. I'm using the XFCE spin of Fedora 17. My video chip set is: 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07). My '.xscreensaver' file contains:

# XScreenSaver Preferences File

# Written by xscreensaver-demo 5.15 for peniwize on Fri Jun 15 20:47:54 2012.

timeout: 0:10:00

cycle: 0:05:00

lock: True

lockTimeout: 0:00:00

passwdTimeout: 0:00:15

visualID: default

installColormap: True

verbose: False

timestamp: True

splash: False

splashDuration: 0:00:05

demoCommand: xscreensaver-demo

prefsCommand: xscreensaver-demo -prefs

nice: 10

memoryLimit: 0

fade: True

unfade: False

fadeSeconds: 0:00:02

fadeTicks: 20

captureStderr: False

ignoreUninstalledPrograms:True

font: *-medium-r-*-140-*-m-*

dpmsEnabled: False

dpmsQuickOff: False

dpmsStandby: 2:00:00

dpmsSuspend: 2:00:00

dpmsOff: 4:00:00

grabDesktopImages: False

grabVideoFrames: False

chooseRandomImages: True

imageDirectory: /usr/share/backgrounds/images

mode: random

selected: -1

textMode: file

textLiteral: XScreenSaver

textFile:

textProgram: fortune -s

textURL:

http://planet.fedoraproject.org/rss20.xml
programs: \

maze -root \n\

GL: superquadrics -root \n\

attraction -root \n\

blitspin -root \n\

greynetic -root \n\

helix -root \n\

hopalong -root \n\

imsmap -root \n\

- noseguy -root \n\

- pyro -root \n\

qix -root \n\

- rocks -root \n\

rorschach -root \n\

decayscreen -root \n\

flame -root \n\

halo -root \n\

slidescreen -root \n\

pedal -root \n\

bouboule -root \n\

- braid -root \n\

coral -root \n\

deco -root \n\

drift -root \n\

- fadeplot -root \n\

galaxy -root \n\

goop -root \n\

grav -root \n\

ifs -root \n\

GL: jigsaw -root \n\

julia -root \n\

- kaleidescope -root \n\

GL: moebius -root \n\

moire -root \n\

GL: morph3d -root \n\

mountain -root \n\

munch -root \n\

penrose -root \n\

GL: pipes -root \n\

rd-bomb -root \n\

GL: rubik -root \n\

- sierpinski -root \n\

slip -root \n\

GL: sproingies -root \n\

starfish -root \n\

strange -root \n\

swirl -root \n\

triangle -root \n\

xjack -root \n\

xlyap -root \n\

GL: atlantis -root \n\

- bsod -root \n\

GL: bubble3d -root \n\

GL: cage -root \n\

- crystal -root \n\

cynosure -root \n\

discrete -root \n\

distort -root \n\

epicycle -root \n\

flow -root \n\

- GL: glplanet -root \n\

interference -root \n\

kumppa -root \n\

GL: lament -root \n\

moire2 -root \n\

GL: sonar -root \n\

GL: stairs -root \n\

truchet -root \n\

- vidwhacker -root \n\

blaster -root \n\

bumps -root \n\

ccurve -root \n\

compass -root \n\

deluxe -root \n\

- demon -root \n\

GL: extrusion -root \n\

- loop -root \n\

penetrate -root \n\

petri -root \n\

phosphor -root \n\

GL: pulsar -root \n\

ripples -root \n\

shadebobs -root \n\

GL: sierpinski3d -root \n\

spotlight -root \n\

squiral -root \n\

wander -root \n\

- webcollage -root \n\

xflame -root \n\

xmatrix -root \n\

GL: gflux -root \n\

- nerverot -root \n\

xrayswarm -root \n\

xspirograph -root \n\

GL: circuit -root \n\

GL: dangerball -root \n\

- GL: dnalogo -root \n\

GL: engine -root \n\

GL: flipscreen3d -root \n\

GL: gltext -root \n\

GL: menger -root \n\

GL: molecule -root \n\

rotzoomer -root \n\

speedmine -root \n\

GL: starwars -root \n\

GL: stonerview -root \n\

vermiculate -root \n\

whirlwindwarp -root \n\

zoom -root \n\

anemone -root \n\

apollonian -root \n\

GL: boxed -root \n\

GL: cubenetic -root \n\

GL: endgame -root \n\

euler2d -root \n\

fluidballs -root \n\

GL: flurry -root \n\

- GL: glblur -root \n\

GL: glsnake -root \n\

halftone -root \n\

GL: juggler3d -root \n\

GL: lavalite -root \n\

- polyominoes -root \n\

GL: queens -root \n\

- GL: sballs -root \n\

GL: spheremonics -root \n\

- thornbird -root \n\

twang -root \n\

- GL: antspotlight -root \n\

apple2 -root \n\

GL: atunnel -root \n\

barcode -root \n\

GL: blinkbox -root \n\

GL: blocktube -root \n\

GL: bouncingcow -root \n\

cloudlife -root \n\

GL: cubestorm -root \n\

eruption -root \n\

GL: flipflop -root \n\

GL: flyingtoasters -root \n\

fontglide -root \n\

GL: gleidescope -root \n\

GL: glknots -root \n\

GL: glmatrix -root \n\

- GL: glslideshow -root \n\

GL: hypertorus -root \n\

- GL: jigglypuff -root \n\

metaballs -root \n\

GL: mirrorblob -root \n\

piecewise -root \n\

GL: polytopes -root \n\

pong -root \n\

popsquares -root \n\

GL: surfaces -root \n\

xanalogtv -root \n\

- abstractile -root \n\

anemotaxis -root \n\

- GL: antinspect -root \n\

fireworkx -root \n\

fuzzyflakes -root \n\

interaggregate -root \n\

intermomentary -root \n\

memscroller -root \n\

GL: noof -root \n\

pacman -root \n\

GL: pinion -root \n\

GL: polyhedra -root \n\

- GL: providence -root \n\

substrate -root \n\

wormhole -root \n\

- GL: antmaze -root \n\

GL: boing -root \n\

boxfit -root \n\

GL: carousel -root \n\

celtic -root \n\

GL: crackberg -root \n\

GL: cube21 -root \n\

fiberlamp -root \n\

GL: fliptext -root \n\

GL: glhanoi -root \n\

GL: tangram -root \n\

GL: timetunnel -root \n\

GL: glschool -root \n\

GL: topblock -root \n\

GL: cubicgrid -root \n\

cwaves -root \n\

GL: gears -root \n\

GL: glcells -root \n\

GL: lockward -root \n\

m6502 -root \n\

GL: moebiusgears -root \n\

GL: voronoi -root \n\

GL: hypnowheel -root \n\

GL: klein -root \n\

- lcdscrub -root \n\

GL: photopile -root \n\

GL: skytentacles -root \n\

GL: rubikblocks -root \n\

GL: companioncube -root \n\

GL: hilbert -root \n\

GL: tronbit -root \n\

pointerPollTime: 0:00:05

pointerHysteresis: 10

windowCreationTimeout:0:00:30

initialDelay: 0:00:00

GetViewPortIsFullOfLies:False

procInterrupts: True

xinputExtensionDev: False

overlayStderr: True