Message-ID: <bf5d157b-4661-3549-5c90-e28be1846e70@leemhuis.info>
Date:   Fri, 3 Dec 2021 11:40:04 +0100
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Harald Dunkel <harri@...ics.de>,
        Javier Martinez Canillas <javierm@...hat.com>
Cc:     Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: 5.15 regression: CONFIG_SYSFB_SIMPLEFB breaks console scrolling

On 25.11.21 13:00, Thorsten Leemhuis wrote:
> On 21.11.21 12:47, Thorsten Leemhuis wrote:
>> Hi, this is your Linux kernel regression tracker speaking.
> /me again

and again :-D

>> On 16.11.21 05:52, Harald Dunkel wrote:
>>>
>>> if I enable CONFIG_SYSFB_SIMPLEFB in 5.15.2 and use grub's default
>>> configuration
>>> (Debian sid amd64), then a few lines at the bottom of /dev/tty1 including
>>> login prompt are off-screen. Scrolling is broken. I can login, though.
>>>
>>> Enabling GRUB_TERMINAL=console in grub doesn't make a difference. Using
>>> the same kernel except for CONFIG_SYSFB_SIMPLEFB the problem is gone.
>>>
>>> Graphics card is a GeForce GTX 1650. I tried with both CONFIG_DRM_NOUVEAU
>>> and proprietary graphics drivers disabled.
>>>
>>> Attached you can find the config file. Please mail if I can help to track
>>> this problem down.
>>
>> Thx for the report. I'm not totally sure if this is a regression, as
>> that's a new config option. But it might be one considered a successor
>> to an older one, hence it might count as regression. Adding two
>> developers and a mailing list to the CC, hopefully someone can clarify.
> 
> Javier, I'd be interested in your option on this.
> 
> Harald, did you have CONFIG_X86_SYSFB enabled in earlier kernel versions
> (and did console scrolling work then)? The answer would help me to
> decide if this a regression, as those ideally should be fixed as quickly
> as possible.

Harald, a reply would have been very helpful; I wonder if Javier is
waiting for the answer, too. If I get none in the next few days I guess
I'll drop this from the list of tracked regressions.

Ciao, Thorsten

#regzbot ignore-activity

>> TWIMC: To be sure this issue doesn't fall through the cracks unnoticed,
>> I'm adding it to regzbot, my Linux kernel regression tracking bot:
>>
>> #regzbot ^introduced 8633ef82f101c040427b57d4df7b706261420b94
>> #regzbot title CONFIG_SYSFB_SIMPLEFB breaks console scrolling
>> #regzbot ignore-activity
>>
>> Ciao, Thorsten, your Linux kernel regression tracker.
>>
>> P.S.: If you want to know more about regzbot, check out its
>> web-interface, the getting start guide, and/or the references documentation:
>>
>> https://linux-regtracking.leemhuis.info/regzbot/
>> https://gitlab.com/knurd42/regzbot/-/blob/main/docs/getting_started.md
>> https://gitlab.com/knurd42/regzbot/-/blob/main/docs/reference.md
>>
>> The last two documents will explain how you can interact with regzbot
>> yourself if your want to.
>>
>> Hint for the reporter: when reporting a regression it's in your interest
>> to tell #regzbot about it in the report, as that will ensure the
>> regression gets on the radar of regzbot and the regression tracker.
>> That's in your interest, as they will make sure the report won't fall
>> through the cracks unnoticed.
>>
>> Hint for developers: you normally don't need to care about regzbot, just
>> fix the issue as you normally would. Just remember to include a 'Link:'
>> tag to the report in the commit message, as explained in
>> Documentation/process/submitting-patches.rst
>> That aspect was recently was made more explicit in commit 1f57bd42b77c:
>> https://git.kernel.org/linus/1f57bd42b77c
> 
> #regzbot title drm: CONFIG_SYSFB_SIMPLEFB breaks console scrolling
> 
> 
> 
> 

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