From owner-freebsd-current@FreeBSD.ORG Mon Feb 16 23:45:48 2015 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 6840CAB4 for ; Mon, 16 Feb 2015 23:45:48 +0000 (UTC) Received: from mail-ie0-f182.google.com (mail-ie0-f182.google.com [209.85.223.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 3716C373 for ; Mon, 16 Feb 2015 23:45:47 +0000 (UTC) Received: by iecvy18 with SMTP id vy18so37210378iec.13 for ; Mon, 16 Feb 2015 15:45:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=nm2ScpOXod2Cgk9cPff394TLwv+rP3pZBMdAcjw2N3c=; b=Pz1o2o5LDAZ7tIIeDvK2hWUeSUQ52IWtisT1N8MgGyKAdNcDqg9RDVfwnAOThTUn0V 3sACE5HrC9KTFZtjhr/PUqIUUSNx/49fL3ackXu5ktDkXSsLt0tSBGzJQjnXpkabZcy7 EnoDLkVswGA4ChKPXu9VAnPk9/2+smw5D5bF3UEOqDLTyRt5SPi9CFMyadz5XAkQatdC H6iwZAdE9KAafnIhZ0iXG7hoJgMxqVK+Y7MqqDeX0eUFKvrYKZHqSiLx506Vtt2nRw62 u+VuidU3t34MtFuF3iF8SqXaFovvxOtF9vKPmExxrHZtoB7RyaO/XM0tRUFJsbUyDoqE A/zg== MIME-Version: 1.0 X-Received: by 10.50.107.7 with SMTP id gy7mr24530844igb.49.1424130346830; Mon, 16 Feb 2015 15:45:46 -0800 (PST) Sender: adrian.chadd@gmail.com Received: by 10.36.17.66 with HTTP; Mon, 16 Feb 2015 15:45:46 -0800 (PST) In-Reply-To: References: Date: Mon, 16 Feb 2015 15:45:46 -0800 X-Google-Sender-Auth: NNy9my8fh0sa5IYBG-eLSnfWuDc Message-ID: Subject: Re: r277959 breaks X display on IvyBridge mobile GT2 IG From: Adrian Chadd To: Ian FREISLICH Content-Type: text/plain; charset=UTF-8 Cc: freebsd-current X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Feb 2015 23:45:48 -0000 On 16 February 2015 at 14:40, Ian FREISLICH wrote: > Ian FREISLICH wrote: >> Adrian Chadd wrote: >> > Hi, >> > >> >> > There's a "invert backlight" option in i915, try setting it to 1? >> >> This is pretty much all I could find (unless I was looking in the >> wrong place). It makes no difference. The backlight appears to >> be disabled. > > Adrian, do you have any idea how to fix the backlight for my laptop? > I ended up reversing out your change r277959 in my local copy to > make the backlight work again here. Hi, I don't, no. I haven't dug further into the i915 backlight control code because, well, a lot of changed in that update. The backlight code was in a lot of flux during the period of time kib chose to fast forward, so it's not unsurprising that it broke for some. I think for now we'll need a quirk that can be added for each laptop we find with that particular behaviour. The real solution is to continue sliding i915 forward in time. -adrian