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

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Message-ID: <05ea3233-20dd-4af7-86cc-de11ad2efe84@kernel.dk>
Date: Fri, 19 Jan 2024 11:39:20 -0700
From: Jens Axboe <axboe@...nel.dk>
To: LKML <linux-kernel@...r.kernel.org>,
 "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Cc: Thomas Zimmermann <tzimmermann@...e.de>,
 avier Martinez Canillas <javierm@...hat.com>, Helge Deller <deller@....de>
Subject: REGRESSION: no console on current -git

Hi,

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?

-- 
Jens Axboe