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Date: Wed, 30 Jul 2025 16:26:44 +0200
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Jari Ruusu <jariruusu@protonmail.com>
Cc: Yi Yang <yiyang13@huawei.com>, GONG Ruiqi <gongruiqi1@huawei.com>,
	Helge Deller <deller@gmx.de>, Sasha Levin <sashal@kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	"stable@vger.kernel.org" <stable@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Text mode VGA-console scrolling is broken in upstream & stable
 trees
Message-ID: <2025073054-stipend-duller-9622@gregkh>
References: <C4_ogGo3eSdgo3wcbkdIXQDoGk2CShDfiQEjnwmgLUvd1cVp5kKguDC4M7KlWO4Tg9Ny3joveq7vH9K_zpBGvIA8-UkU2ogSE1T9Y6782js=@protonmail.com>
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On Wed, Jul 30, 2025 at 02:06:27PM +0000, Jari Ruusu wrote:
> The patch that broke text mode VGA-console scrolling is this one:
> "vgacon: Add check for vc_origin address range in vgacon_scroll()"
> commit 864f9963ec6b4b76d104d595ba28110b87158003 upstream.
> 
> How to preproduce:
> (1) boot a kernel that is configured to use text mode VGA-console
> (2) type commands:  ls -l /usr/bin | less -S
> (3) scroll up/down with cursor-down/up keys
> 
> Above mentioned patch seems to have landed in upstream and all
> kernel.org stable trees with zero testing. Even minimal testing
> would have shown that it breaks text mode VGA-console scrolling.
> 
> Greg, Sasha, Linus,
> Please consider reverting that buggy patch from all affected trees.

Please work to fix it in Linus's tree first and then we will be glad to
backport the needed fix.

thanks,

greg k-h