From 39942fd8ff57c8623451bbfaffe8a184cc8b463a Mon Sep 17 00:00:00 2001 From: Knut Petersen Date: Mon, 12 Dec 2005 22:17:19 -0800 Subject: [PATCH] fbdev: fix switch to KD_TEXT, enhanced version Every framebuffer driver relies on the assumption that the set_par() function of the driver is called before drawing functions and other functions dependent on the hardware state are executed. Whenever you switch from X to a framebuffer console for the very first time, there is a chance that a broken X system has _not_ set the mode to KD_GRAPHICS, thus the vt and framebuffer code executes a screen redraw and several other functions before a set_par() is executed. This is believed to be not a bug of linux but a bug of X/xdm. At least some X releases used by SuSE and Debian show this behaviour. There was a 2nd case, but that has been fixed by Antonino Daplas on 10-dec-2005. This patch allows drivers to set a flag to inform fbcon_switch() that they prefer a set_par() call on every console switch, working around the problems caused by the broken X releases. The flag will be used by the next release of cyblafb and might help other drivers that assume a hardware state different to the one used by X. As the default behaviour does not change, this patch should be acceptable to everybody. Signed-off-by: Knut Petersen Acked-by: "Antonino A. Daplas" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/console/fbcon.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/video') diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c index 8068d2f7efe6..3660e51b2612 100644 --- a/drivers/video/console/fbcon.c +++ b/drivers/video/console/fbcon.c @@ -2103,7 +2103,8 @@ static int fbcon_switch(struct vc_data *vc) fb_set_var(info, &var); ops->var = info->var; - if (old_info != NULL && old_info != info) { + if (old_info != NULL && (old_info != info || + info->flags & FBINFO_MISC_ALWAYS_SETPAR)) { if (info->fbops->fb_set_par) info->fbops->fb_set_par(info); fbcon_del_cursor_timer(old_info); -- cgit v1.2.3