archive mirror
 help / color / mirror / Atom feed
From: Javier Martinez Canillas <>
To: Thorsten Leemhuis <>,
	Harald Dunkel <>
Cc: Kernel Mailing List <>,,
	Thomas Zimmermann <>,
	"" <>
Subject: Re: 5.15 regression: CONFIG_SYSFB_SIMPLEFB breaks console scrolling
Date: Fri, 3 Dec 2021 12:20:25 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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 5.15 regression: CONFIG_SYSFB_SIMPLEFB breaks console scrolling 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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).