From 5ef897c71a8985b62b7ec320a37376daaad364d0 Mon Sep 17 00:00:00 2001 From: "Antonino A. Daplas" Date: Mon, 21 Nov 2005 21:32:26 -0800 Subject: [PATCH] [PATCH] vgacon: Fix usage of stale height value on vc initialization Reported by: Wayne E. Harlan "[1.] One line summary of the problem: When the kernel option "vga=1" is used, additional tty's (alt+control+Fx with x=2,3,4,5, etc) do not provide the full 50 lines of output. The first one does have 50 lines, however. [2.] Full description of the problem/report: These addtitional tty's show only 39 lines plus the top pixel of the 40-th line. The remaining lines are black and not shown. Kernel version 2.6.13.4 does not show this problem." This bug is caused by using a stale font height value on vgacon_init. Booting with vga=1 gives an 80x50 screen with an 8x8 font. Somewhere during the initialization, the font was changed to 8x9 and the first vc was correctly resized to 80x44. However, the rest of the vc's were not allocated yet, and when they were subsequently initialized, they still used a font height of 8 (instead of 9) causing the mentioned bug. Fix by saving the new font height to vga_video_font_height. Signed-off-by: Antonino Daplas Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/console/vgacon.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index 274f90543e32..167de397e4b4 100644 --- a/drivers/video/console/vgacon.c +++ b/drivers/video/console/vgacon.c @@ -966,6 +966,7 @@ static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight) outb_p(0x12, vga_video_port_reg); /* Vertical display limit */ outb_p(vde, vga_video_port_val); spin_unlock_irq(&vga_lock); + vga_video_font_height = fontheight; for (i = 0; i < MAX_NR_CONSOLES; i++) { struct vc_data *c = vc_cons[i].d; -- 2.20.1