linux-kernel - Re: [PATCH v2 0/2] Fix regression introduced by disabling accelerated scrolling in fbcon

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

Cc regressions

On Mon, Jan 24, 2022 at 10:04 PM Helge Deller <deller@....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@...ux-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