On 29. 08. 25, 21:49, Zsolt Kajtar wrote:
> When a 512 glyph font is loaded on vgacon and the bold attributes are in
> effect then the kernel console output (printk) becomes unreadable. It is
> because the brightness bit (used for bold) is at the same place where
> the 8th bit of the glyph index is. This patch adds the missing masking
> to ensure the output will be displayed using the lower half of the font.
>
> Signed-off-by: Zsolt Kajtar <soci@c64.rulez.org>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
I assume you checked all writes to the gfx mem?
> ---
> drivers/tty/vt/vt.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
> index d54f4d24e..4c8c87f21 100644
> --- a/drivers/tty/vt/vt.c
> +++ b/drivers/tty/vt/vt.c
> @@ -3356,7 +3356,8 @@ static void vt_console_print(struct console *co, const char *b, unsigned count)
> continue;
> }
> vc_uniscr_putc(vc, c);
> - scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
> + scr_writew(((vc->vc_attr << 8) & ~vc->vc_hi_font_mask) | c,
> + (unsigned short *)vc->vc_pos);
> notify_write(vc, c);
> cnt++;
> if (vc->state.x == vc->vc_cols - 1) {
--
js
suse labs