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Date:      Sun, 13 Feb 2022 13:02:00 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 261928] drm-kmod / vt newcons: Loading the drm-kmod driver creates a gap in the vt newcons scrollback buffer
Message-ID:  <bug-261928-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261928

            Bug ID: 261928
           Summary: drm-kmod / vt newcons: Loading the drm-kmod driver
                    creates a gap in the vt newcons scrollback buffer
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: sblachmann@gmail.com

When the drm-kmod driver (i915kms, radeonkms, amdgpu) is kldloaded, a big gap
in the vt newcons scrollback buffer is being created.

There are almost a screenful of blank lines being inserted when the screen is
being resized.
This does not create an impression of careful programming, in particular when
also taking into consideration that old output is being overwritten at
(possibly random) positions (see PR261641:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261641 ).

Instead of this behavior, the output should just be continued where the current
printing position in the console was before loading the drm-kmod driver.

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