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authorSamuel Thibault <samuel.thibault@ens-lyon.org>2006-01-08 01:02:34 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:13:51 -0800
commit954de9141e75cf2f1ce69ccdbedc83ec827a01ec (patch)
tree05682a83cafc8784d8e60f0d9e98694ad4a932d2
parentb8b0af24353eafadf58a0889999700e43f135aad (diff)
[PATCH] vgacon: fix doublescan mode
When doublescan mode is in use, scanlines must be doubled. Thanks to Jason Dravet <dravet@hotmail.com> for reporting and testing. Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/video/console/vgacon.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index 167de397e4b..f4e1c4b4191 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -503,10 +503,16 @@ static int vgacon_doresize(struct vc_data *c,
{
unsigned long flags;
unsigned int scanlines = height * c->vc_font.height;
- u8 scanlines_lo, r7, vsync_end, mode;
+ u8 scanlines_lo, r7, vsync_end, mode, max_scan;
spin_lock_irqsave(&vga_lock, flags);
+ outb_p(VGA_CRTC_MAX_SCAN, vga_video_port_reg);
+ max_scan = inb_p(vga_video_port_val);
+
+ if (max_scan & 0x80)
+ scanlines <<= 1;
+
outb_p(VGA_CRTC_MODE, vga_video_port_reg);
mode = inb_p(vga_video_port_val);