linux-kernel - Re: [PATCH 2/2] Revert "fbcon: Disable accelerated scrolling"

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Message-ID: <CAHk-=wikFKjwdUBWCLCu=iL3rFq4BDDF0aBGdXC6ay74yJb+5Q@mail.gmail.com>
Date:   Wed, 19 Jan 2022 16:01:01 +0200
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Helge Deller <deller@....de>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Sven Schnelle <svens@...ckframe.org>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Ilia Mirkin <imirkin@...m.mit.edu>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Pavel Machek <pavel@....cz>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Sam Ravnborg <sam@...nborg.org>, Claudio Suarez <cssk@...-c.es>
Subject: Re: [PATCH 2/2] Revert "fbcon: Disable accelerated scrolling"

On Wed, Jan 19, 2022 at 2:29 PM Helge Deller <deller@....de> wrote:
>
> >>
> >> Ah, no, that was just the soft scrollback code I was thinking of, which
>
> Right.
> That was commit 973c096f6a85 and it was about vgacon, not fbcon.

No, fbcon had some bug too, although I've paged out the details. See
commit 50145474f6ef ("fbcon: remove soft scrollback code").

If I remember correctly (and it's entirely possible that I don't), the
whole "softback_lines" logic had serious problems with resizing the
console (or maybe changing the font size).

There may have been some other bad interaction with
foreground/background consoles too, I forget.

       Linus