From d9ab98d11725360aed9d1bd2e7281dc8a2be7f19 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Imre=20Vad=C3=A1sz?= <imre@vdsz.com>
Date: Fri, 15 Jan 2016 17:36:04 +0100
Subject: [PATCH] i915kms.4: Document the new drm.i915.disable_aux_irq tunable.

---
 share/man/man4/i915kms.4 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/share/man/man4/i915kms.4 b/share/man/man4/i915kms.4
index 3b4b1a9e52..9e061e07c3 100644
--- a/share/man/man4/i915kms.4
+++ b/share/man/man4/i915kms.4
@@ -50,6 +50,15 @@ Tunables can be set at the
 prompt before booting the kernel or stored in
 .Xr loader.conf 5 .
 .Bl -tag -width "xxxxxx"
+.It Va drm.i915.disable_aux_irq
+When non-zero, disable interrupt usage for DisplayPort AUX channel.
+This option doesn't affect GPU models older than Generation 5 (Ironlake).
+Can be used as a workaround in cases where DisplayPort panel
+initialization is unreliable, which often leaves a blank screen after the
+.Nm
+module was loaded.
+.br
+1 = don't use AUX IRQ, 0 = auto (default).
 .It Va drm.i915.enable_psr
 Enable PSR (panel self refresh), only relevant for Haswell and Broadwell
 CPUs.
-- 
2.11.4.GIT