From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1QPxBd-0004bs-IC for garchives@archives.gentoo.org; Fri, 27 May 2011 13:34:45 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id CE4991C04A; Fri, 27 May 2011 13:33:16 +0000 (UTC) Received: from pop-knobcone.atl.sa.earthlink.net (pop-knobcone.atl.sa.earthlink.net [207.69.195.64]) by pigeon.gentoo.org (Postfix) with ESMTP id 9E8861C04A for ; Fri, 27 May 2011 13:33:16 +0000 (UTC) Received: from user-12hck1e.cable.mindspring.com ([69.22.80.46] helo=[192.168.0.51]) by pop-knobcone.atl.sa.earthlink.net with esmtp (Exim 3.36 #1) id 1QPxAC-0004uU-00 for gentoo-user@lists.gentoo.org; Fri, 27 May 2011 09:33:16 -0400 Message-ID: <4DDFA82F.2090003@earthlink.net> Date: Fri, 27 May 2011 09:33:35 -0400 From: Felix Miata Organization: less than infinite User-Agent: Mozilla/5.0 (OS/2; Warp 4.5; rv:2.0.1) Gecko/20110513 SeaMonkey/2.1 Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] No KMS for ATI Rage* (was: Goodbye, Gentoo) References: <20110527145635.6b097bde@marcec.huntemann.uni-oldenburg.de> In-Reply-To: <20110527145635.6b097bde@marcec.huntemann.uni-oldenburg.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Archives-Salt: X-Archives-Hash: 936940174e63b9aa1d0c97d4c7f57505 On 2011/05/27 14:56 (GMT+0200) Marc Joliet composed: > Kevin O'Gorman wrote: >> ...The video card is an ATI Rage XL... > I wonder which kernel version you use, because in 2.6.36/37 I was hit by a nasty > EDID parsing bug. Actually, IIRC the code for parsing EDIDs was updated to > understand more features or something, and that triggered errors that didn't > come up before because those parts of the response from the monitor were simply > ignored until then (or something like that). This lead to my own monitor not > responding for over a minute at a time (sometimes going blank in between) and > other people complained that it left theirs permanently blank. > I think this is the original bug: > https://bugs.freedesktop.org/show_bug.cgi?id=31943 > which contains a workaround (with patch): > "The drm EDID checker is pretty strict about what EDIDs it will accept. Try > this patch and add drm.edid_strict=0 to your kernel command line." > For me, upgrading to 2.6.38 helped, I don't see the problem anymore (though > other people report otherwise). > *If* this is the bug, it makes me wonder why you don't see it under Ubuntu. I suspect the *buntu installer checks to see if the video chip is supported for KMS, and applies nomodeset to Grub's cmdline when not. No ATI Rage* chip is supported by KMS. With such an old laptop, could be he needs both nomodeset and drm.edid_strict=0. I have a 1400x1050 Dell laptop that uses the r128 driver, and its EDID is definitely broken. Whether I had the black screen problem I don't remember, but it's very possible it's what caused me to discover the existence of drm.edid_strict=0 in order to escape from either an 800x600 X or black screens. -- "The wise are known for their understanding, and pleasant words are persuasive." Proverbs 16:21 (New Living Translation) Team OS/2 ** Reg. Linux User #211409 ** a11y rocks! Felix Miata *** http://fm.no-ip.com/