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From: Javier Martinez Canillas <javierm@redhat.com>
To: Thorsten Leemhuis <regressions@leemhuis.info>,
	Harald Dunkel <harri@afaics.de>
Cc: Kernel Mailing List <linux-kernel@vger.kernel.org>,
	dri-devel@lists.freedesktop.org,
	Thomas Zimmermann <tzimmermann@suse.de>,
	"regressions@lists.linux.dev" <regressions@lists.linux.dev>
Subject: Re: 5.15 regression: CONFIG_SYSFB_SIMPLEFB breaks console scrolling
Date: Fri, 3 Dec 2021 12:20:25 +0100	[thread overview]
Message-ID: <5de368f7-91cd-5998-9fe4-1bf448e32742@redhat.com> (raw)
In-Reply-To: <4bf94684-6410-db9f-5bec-ea0540a2ea76@leemhuis.info>

Sorry for the late reply.

On 11/21/21 12:47, Thorsten Leemhuis wrote:
> Hi, this is your Linux kernel regression tracker speaking.
> 
> 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.
>

I don't think this is a regression since enabling CONFIG_SYSFB_SIMPLEFB will
make the simpledrm driver to be bound while disabling the option makes the
efifb driver to be bound instead.
 Yes, it seems to be a bug in the simpledrm driver but the solution if you
have issues with the simpledrm is to not enable CONFIG_SYSFB_SIMPLEFB and
keep using the old fbdev driver.

Best regards,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat


  parent reply	other threads:[~2021-12-03 11:20 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-16  4:52 Harald Dunkel
2021-11-21 11:47 ` Thorsten Leemhuis
2021-11-25 12:00   ` Thorsten Leemhuis
2021-12-03 10:40     ` Thorsten Leemhuis
2021-12-03 11:20   ` Javier Martinez Canillas [this message]
2021-12-05  6:56     ` Thorsten Leemhuis

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