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    SubjectRe: [PATCH] vgacon: Workaround for resize bug in some chipsets
    Antonino A. Daplas, le Sun 13 Nov 2005 06:20:53 +0800, a écrit :
    > "I updated to the development kernel and now during boot only the top of the
    > text is visable. For example the monitor screen the is the lines and I can
    > only see text in the asterik area.
    > ---------------------
    > | **************** |
    > | * * |
    > | * * |
    > | **************** |
    > | |
    > | |
    > | |
    > ---------------------

    Are you missing some left and right part too? What are the dimensions of
    the text screen at bootup? What bootloader are you using? (It could be a
    bug in the boot up text screen dimension discovery).

    > I have a Silicon Graphics 1600sw LCD panel with a Number Nine Revolution 4
    > video card."

    Does vgacon.c properly discovers that it is a VGA board?

    > This bug seems to be a glitch in the VGA core of this chipset. Resizing
    > the screen triggers the mentioned bug.

    Do vga-only games (like old DOS-mode games) work with it?

    > The workaround is to make vgacon avoid calling vgacon_doresize() if the
    > display parameters did not change.

    I.e. never call it, actually.

    > A definitive fix will need to be provided by someone who knows and has the
    > hardware.

    I'm not sure it is hardware-specific. Maybe you have a combination of
    vga bios/bootloader/vga=ask/... that prevents vgacon.c from properly
    discovering the dimensions of the text screen.


    Well, else it looks like a "safe side" patch: people now hit by such bug
    won't be hit any more unless using stty or such.

    Regards,
    Samuel
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