[Bug 215001] Regression in 5.15, Firmware-initialized graphics console selects FB_VGA16, screen corruption

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215001

--- Comment #3 from Kris Karas (bugs-a21 at moonlit-rail.com) ---
Added Javier Martinez to the CC list, as he's the patch author.

I just bisected this bug.  "First bad commit" is
d391c58271072d0b0fad93c82018d495b2633448

Author: Javier Martinez Canillas <javierm at redhat.com>
Date:   Fri Jun 25 15:09:46 2021 +0200

    drivers/firmware: move x86 Generic System Framebuffers support

    The x86 architecture has generic support to register a system framebuffer
    platform device. It either registers a "simple-framebuffer" if the config
    option CONFIG_X86_SYSFB is enabled, or a legacy VGA/VBE/EFI FB device.

    But the code is generic enough to be reused by other architectures and can
    be moved out of the arch/x86 directory.

    This will allow to also support the simple{fb,drm} drivers on non-x86 EFI
    platforms, such as aarch64 where these drivers are only supported with DT.

    Signed-off-by: Javier Martinez Canillas <javierm at redhat.com>
    Acked-by: Borislav Petkov <bp at suse.de>
    Acked-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
    Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>
    Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20210625130947.1803678-2-javierm@redhat.com

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