From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DD6D32512FF; Wed, 22 Oct 2025 06:01:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761112885; cv=none; b=Wk8zudWgp2pWogi6a4tHg8yNBGt9wY4b/BvpeY/ITcLKjrOGPAYbAgMbAW5JolnE8IyfJtkPMwxFlh+psKbV3d7mTHtWj2oWjbPe6SHAG/KeO1ZUJ0FnFQyjqVTLY8QSZ/2kr6KIAD3ZJ8z/7yhqwpNvJw26pQwKQUO2e9LxBow= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761112885; c=relaxed/simple; bh=w/MZeU/86UdRDSiq11nPKaaA+8xdwNa7ZF3MOBzM6uw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=R+hr+BabLaDYv7kTAIChmZ3yfRDm5Sbc+Kb+80UYOMjq17RgyWm7IKOmT1H7ukI7JAmPxoS900snOfN9jYQdd/SMeEB6vAsXioVIDsDrFq2h7GVodG1REFfWh9CIFMFvNzn1MS0gsj4QGxLrICpXyyDCn7bYIyZ/FzG886vqUkM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=TQHsBELa; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="TQHsBELa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 09322C4CEE7; Wed, 22 Oct 2025 06:01:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1761112883; bh=w/MZeU/86UdRDSiq11nPKaaA+8xdwNa7ZF3MOBzM6uw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=TQHsBELaK0dpIfSKG+QaOjtHGgcmIikYGHbTRH+LoHelxy//5W2iCI3T51g4Nk0Zv bV17blgWjLd7/3ESDbrLrETMAyuWDmQAYVoHTgQ2KX82FLbUuR/S4LyIRgumbm+ez2 rza7uOEgJNeBjjEy8y84nwfEtbe1WDqMrK0Ae9ns= Date: Wed, 22 Oct 2025 08:00:50 +0200 From: Greg Kroah-Hartman To: Peter Schneider Cc: Thorsten Leemhuis , stable@vger.kernel.org, patches@lists.linux.dev, Thomas Zimmermann , Nick Bowler , Douglas Anderson , Dave Airlie , Jocelyn Falempe , dri-devel@lists.freedesktop.org Subject: Re: [PATCH 6.17 040/159] drm/ast: Blank with VGACR17 sync enable, always clear VGACRB6 sync off Message-ID: <2025102243-vertebrae-dormitory-0717@gregkh> References: <20251021195043.182511864@linuxfoundation.org> <20251021195044.163217433@linuxfoundation.org> <499eb508-5f24-4ef4-a2a3-f3d76d89db66@leemhuis.info> <2025102235-pediatric-sandlot-f2de@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Oct 22, 2025 at 07:52:53AM +0200, Peter Schneider wrote: > Hi Greg, > > > Am 22.10.2025 um 07:28 schrieb Greg Kroah-Hartman: > > On Wed, Oct 22, 2025 at 06:49:21AM +0200, Thorsten Leemhuis wrote: > > > On 10/21/25 21:50, Greg Kroah-Hartman wrote: > > > > 6.17-stable review patch. If anyone has any objections, please let me know. > > > > > > > > ------------------ > > > > > > > > From: Thomas Zimmermann > > > > > > > > commit 6f719373b943a955fee6fc2012aed207b65e2854 upstream. > > > > > > > > Blank the display by disabling sync pulses with VGACR17<7>. Unblank > > > > by reenabling them. This VGA setting should be supported by all Aspeed > > > > hardware. > > > > > > TWIMC, a regression report about 6.18-rc2 that was bisected to this > > > commit just came in: > > > > > > https://lore.kernel.org/all/a40caf8e-58ad-4f9c-af7f-54f6f69c29bb@googlemail.com/ > > > > > > To quote: > > > > > > """ > > > I have encountered a serious (for me) regression with 6.18-rc2 on my > > > 2-socket Ivy Bridge Xeon E5-2697 v2 server. After > > > booting, my console screen goes blank and stays blank. 6.18-rc1 was > > > still fine. > > > > > > [...] > > > > > > When I revert this from 6.18-rc2, the issue goes away and my console > > > screen works again. > > > """ > > > > Thanks, I'll go drop this patch from the stable queues for now. > > > > greg k-h > > > So Thorsten (thanks!) was 20 minutes quicker ;-) But I just tested this with > 6.12.55-rc1 and 6.17.5-rc1, too, and can confirm that this offending patch > breaks VGA on my machine, and that reverting just this patch against either > RC makes the issue go away. > > I'll retest -rc2 too when it's out. Should be out now, thanks!