lkml.org 
[lkml]   [2005]   [Nov]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] vgacon: Workaround for resize bug in some chipsets
    Samuel Thibault wrote:
    > 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).

    It was just the height. All numbers (done with printk's) look okay from
    bootup. He gets 80 and 25 for ORIG_VIDEO_NUM_COLS and ORIG_VIDEO_NUM_LINES
    respectively.

    >
    >> 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?

    Yes.

    >
    >> 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.

    His console worked before linux-2.6.14-rc2.

    Tony
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-11-13 15:36    [W:0.023 / U:31.060 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site