linux-kernel - Re: REGRESSION: no console on current -git

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Message-ID: <0293b14b-6188-4229-9fb6-29fbbdb8dc83@gmx.de>
Date: Fri, 19 Jan 2024 21:55:32 +0100
From: Helge Deller <deller@....de>
To: Jens Axboe <axboe@...nel.dk>, LKML <linux-kernel@...r.kernel.org>,
 "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
 dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
 Thomas Zimmermann <tzimmermann@...e.de>
Cc: avier Martinez Canillas <javierm@...hat.com>,
 Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Subject: Re: REGRESSION: no console on current -git

Adding Mirsad Todorovac (who reported a similar issue).

On 1/19/24 19:39, Jens Axboe wrote:
> My trusty R7525 test box is failing to show a console, or in fact anything,
> on current -git. There's no output after:
>
> Loading Linux 6.7.0+ ...
> Loading initial ramdisk ...
>
> and I don't get a console up. I went through the bisection pain and
> found this was the culprit:
>
> commit df67699c9cb0ceb70f6cc60630ca938c06773eda
> Author: Thomas Zimmermann <tzimmermann@...e.de>
> Date:   Wed Jan 3 11:15:11 2024 +0100
>
>      firmware/sysfb: Clear screen_info state after consuming it
>
> Reverting this commit, and everything is fine. Looking at dmesg with a
> buggy kernel, I get no frame or fb messages. On a good kernel, it looks
> ilke this:
>
> [    1.416486] efifb: probing for efifb
> [    1.416602] efifb: framebuffer at 0xde000000, using 3072k, total 3072k
> [    1.416605] efifb: mode is 1024x768x32, linelength=4096, pages=1
> [    1.416607] efifb: scrolling: redraw
> [    1.416608] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
> [    1.449746] fb0: EFI VGA frame buffer device
>
> Happy to test a fix, or barring that, can someone just revert this
> commit please?

I've temporarily added a revert patch into the fbdev for-next tree for now,
so people should not face the issue in the for-next series:
https://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev.git/commit/?h=for-next
I'd like to wait for Thomas to return on monday to check the issue
as there are some other upcoming patches in this area from him.

Helge