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

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Date: Sat, 20 Jan 2024 01:27:40 +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>,
 Linus Torvalds <torvalds@...ux-foundation.org>
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 22:22, Jens Axboe wrote:
> On 1/19/24 2:14 PM, Helge Deller wrote:
>> On 1/19/24 22:01, Jens Axboe wrote:
>>> 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.
>>
>> I agree, it would be good to get it fixed for -rc1.
>> So, it's ok for me, but I won't be able to test the revert short time right now.
>> If you can assure that the revert fixes it, and builds in git-head,
>> I can now prepare the pull request for Linus now (or he just reverts
>> commit df67699c9cb0 manually).
>
> I already tested a revert on top of the current tree, and it builds just
> fine and boots with a working console. So reverting it does work and
> solves the issue.

I sent a pull request with the revert.

Thanks!
Helge