<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - APL: Fails to detect second external monitor after a 4k monitor is attached to DUT" href="https://bugs.freedesktop.org/show_bug.cgi?id=107113#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - APL: Fails to detect second external monitor after a 4k monitor is attached to DUT" href="https://bugs.freedesktop.org/show_bug.cgi?id=107113">bug 107113</a> from <a class="email" href="mailto:shawn.c.lee@intel.com" title="Shawn Lee <shawn.c.lee@intel.com>"> Shawn Lee</a> <pre>We did following change and got positive result for this symptom. 1. Do not apply additional latency for watermark setup on BXT/APL platform. 2. Modify min_scanlines to 4 in skl_ddb_min_alloc(). diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 2cc12b48b74d..41357b80a603 100644 — a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -2935,7 +2935,7 @@ static bool skl_needs_memory_bw_wa(struct intel_atomic_state *state) { struct drm_i915_private *dev_priv = to_i915(state->base.dev); - if (IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv) || + if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) return true; @@ -3476,7 +3476,7 @@ skl_ddb_min_alloc(const struct drm_plane_state *pstate, const int plane) struct drm_framebuffer *fb = pstate->fb; struct intel_plane_state *intel_pstate = to_intel_plane_state(pstate); uint32_t src_w, src_h; - uint32_t min_scanlines = 8; + uint32_t min_scanlines = 4; uint8_t plane_bpp;</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>