From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keith Packard Subject: Re: [PATCH] drm/i915/crt: Only support DPMS On/Off with the PCH registers Date: Tue, 10 Apr 2012 10:30:46 -0700 Message-ID: <86wr5nebp5.fsf@sumi.keithp.com> References: <1334046930-27924-1-git-send-email-chris@chris-wilson.co.uk> <4F8433A6.7020202@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from keithp.com (home.keithp.com [63.227.221.253]) by gabe.freedesktop.org (Postfix) with ESMTP id B66E99E75D for ; Tue, 10 Apr 2012 10:30:49 -0700 (PDT) In-Reply-To: <4F8433A6.7020202@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: Adam Jackson , Chris Wilson Cc: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org <#part sign=pgpmime> On Tue, 10 Apr 2012 09:20:38 -0400, Adam Jackson wrote: > On 4/10/12 4:35 AM, Chris Wilson wrote: > > As part of the PCH split, the ability to control CRT standby/suspend > > states was defeatured; the bits are now marked reserved and apparently > > have no effect. > > Are the intermediate states even tested? I have vague memories of them > not working. I'd be just as happy to see them aliased to Off. It's worse than that -- iirc, there were patent issues with the intermediate states which caused them to be removed from some newer display signaling standards... As far as I know, only CRTs could usefully use them anyways. -- keith.packard@intel.com