Linux on a Fujitsu U810 - X restart problem

Some times, when resuming, X restarts. The log says:

[81153.512179] [drm:i915_get_vblank_counter] *ERROR* trying to get vblank count for disabled pipe 1
acpid: client has disconnected
gdm[24396]: WARNING: gdm_slave_xioerror_handler: Fatal X error - Restarting :0
acpid: client connected from 8006[0:0]
kernel: [81167.781564] [drm:i915_getparam] *ERROR* Unknown parameter 6
kernel: [81169.720875] [drm:i915_getparam] *ERROR* Unknown parameter 6

need to investigate ...

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