<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - eDP can't display on Hsw-ULT in UEFI mode" href="https://bugs.freedesktop.org/show_bug.cgi?id=65024#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - eDP can't display on Hsw-ULT in UEFI mode" href="https://bugs.freedesktop.org/show_bug.cgi?id=65024">bug 65024</a> from <a class="email" href="mailto:xiong.y.zhang@intel.com" title="XiongZhang <xiong.y.zhang@intel.com>"> XiongZhang</a> <pre>The issue seems relate to dp link bandwidth. If I add following patch, eDP can display correctly. diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 3426a61..2d26f8f 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -724,6 +724,8 @@ intel_dp_compute_config(struct intel_encoder *encoder, bpp = min_t(int, 8*3, pipe_config->pipe_bpp); if (is_edp(intel_dp) && dev_priv->vbt.edp_bpp) bpp = min_t(int, bpp, dev_priv->vbt.edp_bpp); + + bpp = 24; for (; bpp >= 6*3; bpp -= 2*3) { mode_rate = intel_dp_link_required(target_clock, bpp); @@ -744,6 +746,8 @@ intel_dp_compute_config(struct intel_encoder *encoder, return false; found: + bpp = 18; + if (intel_dp->color_range_auto) { Bios report dev_priv->vbt.edp_bpp=18.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>