Hi, Looks like "[PATCH] drm/i915: tune down the fast link training vs boot fail" is based on https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/i915/intel_dp.c?id=d4cb3fd9b548b8bfe2a712ec920b9ebabd3547ab Combined I get this diff --- a/drivers/gpu/drm/i915/intel_dp.c 2017-01-08 14:37:01.443536926 +0100 +++ b/drivers/gpu/drm/i915/intel_dp.c 2017-01-08 14:37:17.703138505 +0100 @@ -4017,6 +4017,11 @@ if (!to_intel_crtc(intel_encoder->base.crtc)->active) return; + /* FIXME: we need to synchronize this sort of stuff with hardware + * readout. Currently fast link training doesn't work on boot-up. */ + if (!intel_dp->lane_count) + return; + /* if link training is requested we should perform it always */ if ((intel_dp->compliance_test_type == DP_TEST_LINK_TRAINING) || (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count))) { Regards, Koos -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html