From patchwork Thu Oct 4 10:34:16 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Kuoppala X-Patchwork-Id: 1546041 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by patchwork2.kernel.org (Postfix) with ESMTP id 6234FE00DC for ; Thu, 4 Oct 2012 10:52:09 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4F5F1A0E5E for ; Thu, 4 Oct 2012 03:52:09 -0700 (PDT) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTP id AC97F9EFEB for ; Thu, 4 Oct 2012 03:34:28 -0700 (PDT) Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga101.fm.intel.com with ESMTP; 04 Oct 2012 03:34:27 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.80,533,1344236400"; d="scan'208";a="229828340" Received: from rosetta.fi.intel.com (HELO rosetta) ([10.237.72.92]) by fmsmga001.fm.intel.com with ESMTP; 04 Oct 2012 03:34:27 -0700 Received: by rosetta (Postfix, from userid 1000) id 8361A641BC3; Thu, 4 Oct 2012 13:34:28 +0300 (EEST) From: mika.kuoppala@intel.com To: dri-devel@lists.freedesktop.org Subject: [PATCH] Documentation: kernel-parameters.txt Add drm_kms_helper.poll Date: Thu, 4 Oct 2012 13:34:16 +0300 Message-Id: <1349346856-6104-1-git-send-email-mika.kuoppala@intel.com> X-Mailer: git-send-email 1.7.9.5 X-Mailman-Approved-At: Thu, 04 Oct 2012 03:51:12 -0700 Cc: Mika Kuoppala X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: dri-devel-bounces+patchwork-dri-devel=patchwork.kernel.org@lists.freedesktop.org Errors-To: dri-devel-bounces+patchwork-dri-devel=patchwork.kernel.org@lists.freedesktop.org From: Mika Kuoppala Add description for drm_kms_helper.poll module parameter introduced by commit: e58f637bb96d5a0ae0919b9998b891d1ba7e47c9 Signed-off-by: Mika Kuoppala Reviewed-by: Daniel Vetter Acked-by: Paul Menzel --- Documentation/kernel-parameters.txt | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index f777fa9..ad97749 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -741,6 +741,17 @@ bytes respectively. Such letter suffixes can also be entirely omitted. if its name and a colon are prepended to the EDID name. + drm_kms_helper.poll= + Polling for connected VGA devices on older systems + can be quite expensive, causing latencies of + several hundred milliseconds. This will cause visible + stalls, for example in video playback. If you + experience stalls in display output occurring every + 10 seconds (DRM_OUTPUT_POLL_PERIOD=(10*HZ)), disabling + polling might help. + Format: (1/Y/y=enable, 0/N/n=disable) + default: enabled + dscc4.setup= [NET] dyndbg[="val"] [KNL,DYNAMIC_DEBUG]