Commit b6e8f00f authored Jul 17, 2007 by izumi Committed by Linus Torvalds Jul 17, 2007

Fix the graphic corruption issue on IA64 machines



VGA console driver can misunderstand the current mode(Text/Graphic) under
"disable console blanking" setting.  When "disable console blank" is set
(blankinterval=0), "do_unblank_screen()" function returns without changing
"blank_state", and when "blank_state" is "blank_off", "do_blank_screen()
function returns without invoking sw->con_blank() function.  That's why VGA
console driver can misunderstand the current mode.

Signed-off-by: Nobuhiro Tachino <ntachino@redhat.com>
Signed-off-by: Taku Izumi <izumi2005@soft.fujitsu.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: "Luck, Tony" <tony.luck@intel.com>
Acked-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 1a3f2881

drivers/char/vt.c

+5 −3

Original line number	Diff line number	Diff line
		@@ -3506,9 +3506,6 @@ void do_blank_screen(int entering_gfx)
		}
		return;
		}
		if (blank_state != blank_normal_wait)
		return;
		blank_state = blank_off;

		/* entering graphics mode? */
		if (entering_gfx) {
		@@ -3516,10 +3513,15 @@ void do_blank_screen(int entering_gfx)
		save_screen(vc);
		vc->vc_sw->con_blank(vc, -1, 1);
		console_blanked = fg_console + 1;
		blank_state = blank_off;
		set_origin(vc);
		return;
		}

		if (blank_state != blank_normal_wait)
		return;
		blank_state = blank_off;

		/* don't blank graphics */
		if (vc->vc_mode != KD_TEXT) {
		console_blanked = fg_console + 1;

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