Hi,
Running current -git on my laptop (20FB, X1 Carbon gen4, skylake), I get a lot of the below warnings. Things seem to work fine (in fact it seems faster in general use than previously), but it's a lot of warning spew.
[ 764.877978] [drm] Atomic update on pipe (A) took 156 us, max time under evasion is 100 us [ 1210.063144] [drm] Atomic update on pipe (A) took 152 us, max time under evasion is 100 us [ 1272.208727] [drm] Atomic update on pipe (A) took 213 us, max time under evasion is 100 us [ 1308.106266] [drm] Atomic update on pipe (A) took 194 us, max time under evasion is 100 us [ 1308.439572] [drm] Atomic update on pipe (A) took 202 us, max time under evasion is 100 us [ 1371.905950] [drm] Atomic update on pipe (A) took 135 us, max time under evasion is 100 us [ 1373.891378] [drm] Atomic update on pipe (A) took 202 us, max time under evasion is 100 us [ 1497.259572] [drm] Atomic update on pipe (A) took 199 us, max time under evasion is 100 us [ 1497.292922] [drm] Atomic update on pipe (A) took 178 us, max time under evasion is 100 us [ 1497.326313] [drm] Atomic update on pipe (A) took 188 us, max time under evasion is 100 us [ 1534.106959] [drm] Atomic update on pipe (A) took 223 us, max time under evasion is 100 us [ 1534.190331] [drm] Atomic update on pipe (A) took 180 us, max time under evasion is 100 us [ 1680.613275] [drm] Atomic update on pipe (A) took 101 us, max time under evasion is 100 us [ 1870.783352] [drm] Atomic update on pipe (A) took 188 us, max time under evasion is 100 us [ 2338.083752] [drm] Atomic update on pipe (A) took 225 us, max time under evasion is 100 us [ 2405.212252] [drm] Atomic update on pipe (A) took 114 us, max time under evasion is 100 us [ 2421.811125] [drm] Atomic update on pipe (A) took 112 us, max time under evasion is 100 us [ 2426.344151] [drm] Atomic update on pipe (A) took 137 us, max time under evasion is 100 us [ 2439.012088] [drm] Atomic update on pipe (A) took 143 us, max time under evasion is 100 us [ 2446.011309] [drm] Atomic update on pipe (A) took 163 us, max time under evasion is 100 us [ 2446.142622] [drm] Atomic update on pipe (A) took 112 us, max time under evasion is 100 us [ 2446.542772] [drm] Atomic update on pipe (A) took 137 us, max time under evasion is 100 us [ 2448.243922] [drm] Atomic update on pipe (A) took 157 us, max time under evasion is 100 us [ 2450.042450] [drm] Atomic update on pipe (A) took 157 us, max time under evasion is 100 us [ 2456.575226] [drm] Atomic update on pipe (A) took 131 us, max time under evasion is 100 us [ 2457.275176] [drm] Atomic update on pipe (A) took 115 us, max time under evasion is 100 us [ 2464.308098] [drm] Atomic update on pipe (A) took 112 us, max time under evasion is 100 us [ 2569.418646] [drm] Atomic update on pipe (A) took 179 us, max time under evasion is 100 us [ 2572.302065] [drm] Atomic update on pipe (A) took 133 us, max time under evasion is 100 us [ 2589.933225] [drm] Atomic update on pipe (A) took 168 us, max time under evasion is 100 us [ 2590.701810] [drm] Atomic update on pipe (A) took 175 us, max time under evasion is 100 us [ 2606.732899] [drm] Atomic update on pipe (A) took 130 us, max time under evasion is 100 us [ 2611.732710] [drm] Atomic update on pipe (A) took 147 us, max time under evasion is 100 us [ 2615.532819] [drm] Atomic update on pipe (A) took 145 us, max time under evasion is 100 us [ 2654.412509] [drm] Atomic update on pipe (A) took 157 us, max time under evasion is 100 us [ 2657.012470] [drm] Atomic update on pipe (A) took 168 us, max time under evasion is 100 us [ 2714.341971] [drm] Atomic update on pipe (A) took 144 us, max time under evasion is 100 us [ 2775.486168] [drm] Atomic update on pipe (A) took 138 us, max time under evasion is 100 us [ 2782.852360] [drm] Atomic update on pipe (A) took 113 us, max time under evasion is 100 us [ 2795.319781] [drm] Atomic update on pipe (A) took 188 us, max time under evasion is 100 us [ 2818.601093] [drm] Atomic update on pipe (A) took 160 us, max time under evasion is 100 us [ 2867.998524] [drm] Atomic update on pipe (A) took 167 us, max time under evasion is 100 us [ 2878.980535] [drm] Atomic update on pipe (A) took 163 us, max time under evasion is 100 us [ 2945.607547] [drm] Atomic update on pipe (A) took 110 us, max time under evasion is 100 us [ 2957.606588] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A (start=177768 end=177769) time 214 us, min 1431, max 1439, scanline start 1423, end 1442 [ 2958.609128] [drm] Atomic update on pipe (A) took 168 us, max time under evasion is 100 us [ 2960.059591] [drm] Atomic update on pipe (A) took 186 us, max time under evasion is 100 us [ 2960.658177] [drm] Atomic update on pipe (A) took 181 us, max time under evasion is 100 us [ 3002.688632] [drm] Atomic update on pipe (A) took 210 us, max time under evasion is 100 us [ 3021.939015] [drm] Atomic update on pipe (A) took 140 us, max time under evasion is 100 us [ 3022.487159] [drm] Atomic update on pipe (A) took 178 us, max time under evasion is 100 us [ 3035.134699] [drm] Atomic update on pipe (A) took 109 us, max time under evasion is 100 us [ 3066.834414] [drm] Atomic update on pipe (A) took 178 us, max time under evasion is 100 us [ 3089.166099] [drm] Atomic update on pipe (A) took 182 us, max time under evasion is 100 us [ 3094.565358] [drm] Atomic update on pipe (A) took 178 us, max time under evasion is 100 us [ 3099.498272] [drm] Atomic update on pipe (A) took 184 us, max time under evasion is 100 us [ 3114.162375] [drm] Atomic update on pipe (A) took 155 us, max time under evasion is 100 us [ 3344.500953] [drm] Atomic update on pipe (A) took 112 us, max time under evasion is 100 us [ 3374.664435] [drm] Atomic update on pipe (A) took 175 us, max time under evasion is 100 us [ 3398.468489] [drm] Atomic update on pipe (A) took 168 us, max time under evasion is 100 us [ 3398.864789] [drm] Atomic update on pipe (A) took 158 us, max time under evasion is 100 us [ 3399.733254] [drm] Atomic update on pipe (A) took 168 us, max time under evasion is 100 us [ 3416.316141] [drm] Atomic update on pipe (A) took 175 us, max time under evasion is 100 us [ 3424.065187] [drm] Atomic update on pipe (A) took 149 us, max time under evasion is 100 us [ 3942.736123] [drm] Atomic update on pipe (A) took 255 us, max time under evasion is 100 us [ 4366.622324] [drm] Atomic update on pipe (A) took 274 us, max time under evasion is 100 us [ 5401.716629] [drm] Atomic update on pipe (A) took 198 us, max time under evasion is 100 us [ 5587.292655] [drm] Atomic update on pipe (A) took 175 us, max time under evasion is 100 us [ 7272.084592] [drm] Atomic update on pipe (A) took 233 us, max time under evasion is 100 us [ 7420.257422] [drm] Atomic update on pipe (A) took 213 us, max time under evasion is 100 us [ 7938.997404] [drm] Atomic update on pipe (A) took 241 us, max time under evasion is 100 us [ 8341.927989] [drm] Atomic update on pipe (A) took 119 us, max time under evasion is 100 us [ 8549.094800] [drm] Atomic update on pipe (A) took 221 us, max time under evasion is 100 us [ 8550.202973] [drm] Atomic update on pipe (A) took 296 us, max time under evasion is 100 us [ 8648.787792] [drm] Atomic update on pipe (A) took 214 us, max time under evasion is 100 us