linux-kernel - Re: [PATCH] drm/i915: Discard large BIOS framebuffers causing display corruption.

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Date:   Sat, 08 Jan 2022 05:11:50 +0000
From:   Orlando Chamberlain <redecorating@...tonmail.com>
To:     jani.nikula@...ux.intel.com
Cc:     ashisharora.linux@...look.com, intel-gfx@...ts.freedesktop.org,
        joonas.lahtinen@...ux.intel.com, linux-kernel@...r.kernel.org,
        rodrigo.vivi@...el.com, Aun-Ali Zaidi <admin@...eit.net>
Subject: Re: [PATCH] drm/i915: Discard large BIOS framebuffers causing display corruption.

I haven't observed "display corruption", but on my MacBookPro16,1 the bottom
and right edges of the TTY are not on the screen, so a few lines of text
cannot be seen.

This also occurs on the internal displays of all (as far as I know) other
2018-2020 Intel Macbooks when using the Intel GPU (The 15" and 16" ones
also have an AMDGPU, but this issue occurs when they have the Intel GPU
set as the boot gpu).

There's a similar patch that hasn't been sent upstream that people with these
Macbooks have been using:
https://github.com/aunali1/linux-mbp-arch/blob/master/7001-drm-i915-fbdev-Discard-BIOS-framebuffers-exceeding-h.patch

Cc: Aun-Ali Zaidi <admin@...eit.net>

--
Thanks,
Orlando