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    Subjectproblem with vgacon on Alphas

    after some reports about freezing Alpha machines with 2.1.113 as soon
    as someone switches from X to a normal console. I've tried it myself and
    my machine also stopped after I pressed CTRL-ALT-F1 under X.

    I've tracked the problem down (serial console is your friend) to
    a memcpy_from(), where the source is a kernel address, which is
    a no no on Alphas. Below is a patch, which fixes this problem.

    I hope the patch will make into one of the next kernels.


    Index: vgacon.c
    RCS file: /usr/src/cvs/linux/drivers/video/vgacon.c,v
    retrieving revision
    diff -u -r1.1.1.8 vgacon.c
    --- vgacon.c 1998/08/02 09:55:38
    +++ vgacon.c 1998/08/08 11:59:09
    @@ -454,6 +454,8 @@
    vga_video_num_columns = c->vc_cols;
    vga_video_num_lines = c->vc_rows;
    + if (vga_is_gfx)
    + return 1;
    scr_memcpyw_to((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf, c->vc_screenbuf_size);
    return 0; /* Redrawing not needed */
    @@ -934,6 +936,8 @@
    c->vc_x = ORIG_X;
    c->vc_y = ORIG_Y;
    + if (vga_is_gfx)
    + return;
    scr_memcpyw_from((u16 *) c->vc_screenbuf, (u16 *) c->vc_origin, c->vc_screenbuf_size);

    See, you not only have to be a good coder to create a system like Linux,
    you have to be a sneaky bastard too ;-)
    [Linus Torvalds in <4rikft$7g5@linux.cs.Helsinki.FI>]

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