x11 not properly set

Pol xtekhne at gmail.com
Sun May 24 22:55:11 PDT 2009

With my recently installed opensuse 11.1 on my hp tc4200 tablet. (laptop),
X11 is not working well: sometimes windows disappear for few seconds and 
other minor weird things happen.
My graphics card is intel  915GM

Inspecting the /var/log/Xorg.0.org, i have found three lines with the error

  (EE) intel(0): underrun on pipe B!

What is its meaning?

  usbDetect: can not ioctl version
   Wacom xf86WcmWrite error : Input/output error

Any hints?

Thank you

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