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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Tue, 25 Jan 2022 09:30:56 +0100
Message-ID: <CAMuHMdU5m2z1FmYi2-+rwpr4xc8F_V4TivKcddzA6oVReUijOQ@mail.gmail.com>
Subject: Re: [PATCH v2 0/2] Fix regression introduced by disabling accelerated
 scrolling in fbcon
To:     Helge Deller <deller@gmx.de>
Cc:     DRI Development <dri-devel@lists.freedesktop.org>,
        Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
        Javier Martinez Canillas <javierm@redhat.com>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Gerd Hoffmann <kraxel@redhat.com>,
        Sven Schnelle <svens@stackframe.org>,
        Claudio Suarez <cssk@net-c.es>, Pavel Machek <pavel@ucw.cz>,
        Tomi Valkeinen <tomi.valkeinen@ti.com>,
        Ilia Mirkin <imirkin@alum.mit.edu>,
        Sam Ravnborg <sam@ravnborg.org>,
        Daniel Vetter <daniel.vetter@intel.com>,
        regressions@lists.linux.dev
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Cc regressions

On Mon, Jan 24, 2022 at 10:04 PM Helge Deller <deller@gmx.de> wrote:
> This series reverts two patches which disabled scrolling acceleration in
> fbcon/fbdev. Those patches introduced a regression for fbdev-supported graphic
> cards because of the performance penalty by doing screen scrolling by software
> instead of using existing 2D hardware acceleration.

In the mean time, a userspace regression has been reported, too:
https://lwn.net/Articles/882054/
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988039

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds