1. 13 May, 2021 1 commit
    • Maciej W. Rozycki's avatar
      vgacon: Record video mode changes with VT_RESIZEX · d4d0ad57
      Maciej W. Rozycki authored
      Fix an issue with VGA console font size changes made after the initial
      video text mode has been changed with a user tool like `svgatextmode'
      calling the VT_RESIZEX ioctl.  As it stands in that case the original
      screen geometry continues being used to validate further VT resizing.
      
      Consequently when the video adapter is firstly reprogrammed from the
      original say 80x25 text mode using a 9x16 character cell (720x400 pixel
      resolution) to say 80x37 text mode and the same character cell (720x592
      pixel resolution), and secondly the CRTC character cell updated to 9x8
      (by loading a suitable font with the KD_FONT_OP_SET request of the
      KDFONTOP ioctl), the VT geometry does not get further updated from 80x37
      and only upper half of the screen is used for the VT, with the lower
      half showing rubbish corresponding to whatever happens to be there in
      the video memory that maps to that part of the screen.  Of course the
      proportions change according to text mode geometries and font sizes
      chosen.
      
      Address the problem then, by updating the text mode geometry defaults
      rather than checking against them whenever the VT is resized via a user
      ioctl.
      Signed-off-by: default avatarMaciej W. Rozycki <macro@orcam.me.uk>
      Fixes: e400b6ec ("vt/vgacon: Check if screen resize request comes from userspace")
      Cc: stable@vger.kernel.org # v2.6.24+
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d4d0ad57
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