Hello Daniel and Francois, apologies for posting 'out of thread'. > Can you please re-grab the > dumps? http://luna.vmars.tuwien.ac.at/~froemel/ird_noi915.txt http://luna.vmars.tuwien.ac.at/~froemel/ird_i915.txt http://luna.vmars.tuwien.ac.at/~froemel/ird_i915_pC.txt (short freeze, screen looks for a second scaled to 2/3 (black border), same corruption and then looks just like before) Also, have you seen this post by 'gschwind': http://ubuntuforums.org/showpost.php?p=12160766&postcount=70 ? For convenience reasons the patch that is attached to the forum post: --- linux-3.5.1.orig/drivers/gpu/drm/i915/intel_display.c 2012-08-09 17:23:56.000000000 +0200 +++ linux-3.5.1/drivers/gpu/drm/i915/intel_display.c 2012-08-09 21:13:43.146996673 +0200 @@ -3583,7 +3583,8 @@ if (intel_encoder->type == INTEL_OUTPUT_EDP) { /* Use VBT settings if we have an eDP panel */ - unsigned int edp_bpc = dev_priv->edp.bpp / 3; + //unsigned int edp_bpc = dev_priv->edp.bpp / 3; + unsigned int edp_bpc = 8; if (edp_bpc < display_bpc) { DRM_DEBUG_KMS("clamping display bpc (was %d) to eDP (%d)\n", display_bpc, edp_bpc); Cheers, Bernhard