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

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Date: Fri, 19 Jan 2024 14:01:55 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Helge Deller <deller@....de>, 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

On 1/19/24 1:55 PM, Helge Deller wrote:
> 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.

Given the issue (and that I'm not the only one reporting it), can we
please just get that pushed so it'll make -rc1? It can always get
re-introduced in a fixed fashion. I don't run -next here, I rely on
mainline working for my testing.

-- 
Jens Axboe