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

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Date: Fri, 19 Jan 2024 17:32:52 -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>,
 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 5:27 PM, Helge Deller wrote:
> 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! You forgot the Reported-by, but no big deal.

-- 
Jens Axboe