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authorKnut Petersen <Knut_Petersen@t-online.de>2005-12-13 01:17:19 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-12-13 01:31:17 -0500
commit39942fd8ff57c8623451bbfaffe8a184cc8b463a (patch)
treecc40ada654e14d496dbc4db9d9d42b81c1c8f2f7 /drivers
parent4e1567d3aad9bae0ecc5bb047179cd026bfb035c (diff)
[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 <Knut_Petersen@t-online.de> Acked-by: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/video/console/fbcon.c3
1 files changed, 2 insertions, 1 deletions
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)
2103 fb_set_var(info, &var); 2103 fb_set_var(info, &var);
2104 ops->var = info->var; 2104 ops->var = info->var;
2105 2105
2106 if (old_info != NULL && old_info != info) { 2106 if (old_info != NULL && (old_info != info ||
2107 info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2107 if (info->fbops->fb_set_par) 2108 if (info->fbops->fb_set_par)
2108 info->fbops->fb_set_par(info); 2109 info->fbops->fb_set_par(info);
2109 fbcon_del_cursor_timer(old_info); 2110 fbcon_del_cursor_timer(old_info);