Indeed, accel_clear_margins() calculates the margins as

    unsigned int cw = vc->vc_font.width;
    unsigned int ch = vc->vc_font.height;
    unsigned int rw = info->var.xres % cw;
    unsigned int bh = info->var.yres % ch;

However, if it would use

    unsigned int rw = info->var.xres - (vc->vc_cols*cw);
    unsigned int bh = info->var.yres - (vc->vc_rows*ch);

it would work with higher differences, too. And it would be a bit faster
(multiply and subtract vs. modulo).

Applied.



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