From: Samuel Thibault <[email protected]>
To: Jason Dravet <[email protected]>
CC: [email protected], [email protected], [email protected],
[email protected],[email protected], [email protected]
Subject: Re: [PATCH] vgacon: Workaround for resize bug in some chipsets
Date: Thu, 17 Nov 2005 00:52:16 +0100
Hi,
The following patch should correct the issue:
When doublescan mode is in use, scanlines must be doubled.
Signed-off-by: Samuel Thibault <[email protected]>
--- drivers/video/console/vgacon.c.orig 2005-11-17 00:40:02.000000000 +0100
+++ drivers/video/console/vgacon.c 2005-11-17 00:42:27.000000000 +0100
@@ -502,10 +502,16 @@
{
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);
The patch does fix my problem. Thank you Samuel. I really appreciate the
work you and Antonino have done on this issue. I look forward to seeing
this patch in the mainline.
Thanks again,
Jason Dravet
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