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    SubjectRe: fbcon scrolling madness + fbset corruption
    No one's commented on this yet.

    James?

    On Sun, Feb 02, 2003 at 07:57:44PM +0000, Russell King wrote:
    > This doesn't appear to solve the ywrap problem - I still get
    > places where the screen doesn't scroll. I decided to write a
    > small program to dump out the contents of fb_var_screeninfo, and
    > where stuff goes horribly wrong:
    >
    > bash-2.04# ./tst
    > Visible: 1280x1024
    > Virtual: 1280x1632
    > BPP : 8
    > Offset : +0+2352
    > bash-2.04# ./tst
    > Visible: 1280x1024
    > Virtual: 1280x1632
    > BPP : 8
    > Offset : +0+2392
    >
    > Up to the point where it goes wrong:
    >
    > bash-2.04# ./tst
    > Visible: 1280x1024
    > Virtual: 1280x1632
    > BPP : 8
    > Offset : +0+528
    > bash-2.04# ./tst
    > Visible: 1280x1024
    > Virtual: 1280x1632
    > BPP : 8
    > Offset : +0+568
    > bash-2.04# ./tst
    > Visible: 1280x1024 <--- this is the last line on the screen
    > Virtual: 1280x1632
    > BPP : 8
    > Offset : +0+608
    > bash-2.04#
    >
    > So it looks like something isn't limiting the yoffset in the generic
    > console layer; an xoffset of 2392 when the maximum virtual Y is 1632
    > is just nonsense.
    >
    > I also noticed an additional problem with fbcon: if I change the
    > resolution using fbset, the change occurs, except I end up with
    > corrupted mess on the screen (the reminents of the original display.)
    > The shell prompt is nowhere to be seen.
    >
    > Hitting ^L clears the screen and then the shell prompt is visiable.

    --
    Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
    http://www.arm.linux.org.uk/personal/aboutme.html

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