Running testing, and using the nouveau driver for a GeForce 7150M / nForce 630M 
GPU.  X sporadically crashes to a black screen where things scroll by too fast 
for me 
to read.  I’ve tried to examine  kern.log and Xorg.0.log, as well as google 
searches.  
Xorg.0.log shows an error:

cat /var/log/Xorg.0.log |grep EE
[    51.593] (EE) Failed to load module “modesetting” (module does not exist, 0)

and three warnings:

cat /var/log/Xorg.0.log |grep WW
[    51.593] (WW) Warning, couldn’t open module modesetting
[    51.636] (WW) Falling back to old probe method for vesa
[    51.637] (WW) Falling back to old probe method for fbdev

fbdev* and vesa are then unloaded:

cat /var/log/Xorg.0.log|grep fbdev
[    51.654] (II) Module fbdevhw: vendor=”X.Org Foundation”
[    52.011] (II) UnloadModule: “fbdev”
[    52.011] (II) Unloading fbdev
[    52.011] (II) UnloadSubModule: “fbdevhw”
[    52.012] (II) Unloading fbdevhw
[    51.628] (II) Module fbdev: vendor=”X.Org Foundation”
[    52.011] (II) UnloadModule: “fbdev”
[    52.011] (II) Unloading fbdev
[    52.011] (II) UnloadSubModule: “fbdevhw”
[    52.012] (II) Unloading fbdevhw

cat /var/log/Xorg.0.log|grep vesa
[    51.266] (==) Matched vesa as autoconfigured driver 4
[    51.564] (II) LoadModule: “vesa”
[    51.565] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[    51.592] (II) Module vesa: vendor=”X.Org Foundation”
[    51.630] (II) VESA: driver for VESA chipsets: vesa
[    51.636] (WW) Falling back to old probe method for vesa
[    52.011] (II) UnloadModule: “vesa”
[    52.011] (II) Unloading vesa

 KMS is enabled in the kernel:

cat /boot/config-3.10-3-686-pae|grep -i kms
CONFIG_DRM_KMS_HELPER=m
CONFIG_DRM_I915_KMS=y

Might any of this be related to the X crash?  I don’t think so, but then ...

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