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authorJordan Crouse <jordan.crouse@amd.com>2006-01-06 00:12:16 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:39 -0800
commit3841b0a173cb6fc52163e67c03280543f2412db3 (patch)
tree38b55ab607add98d3423e6b6b7ef63c1b8a19b47 /arch/i386
parenta7a4ad0998dcd682f4968e8ec5fc1259914a1c4a (diff)
[PATCH] APM Screen Blanking fix
- Fix screen blanking on BIOSes that return APM_NOT_ENGAGED when APM enabled screen blanking is not turned on. The original code only tried to set the state on device 0x100, and then 0x1FF, and I added 0x101 to the mix too. - Clean up logic in apm_console_blank(). - Prevent the error message from printing out twice. Cc: Jordan Crouse <jordan.crouse@amd.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/kernel/apm.c27
1 files changed, 14 insertions, 13 deletions
diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index d0b488056cc..2d793d4aef1 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -1064,22 +1064,23 @@ static int apm_engage_power_management(u_short device, int enable)
static int apm_console_blank(int blank)
{
- int error;
- u_short state;
+ int error, i;
+ u_short state;
+ static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
- /* Blank the first display device */
- error = set_power_state(0x100, state);
- if ((error != APM_SUCCESS) && (error != APM_NO_ERROR)) {
- /* try to blank them all instead */
- error = set_power_state(0x1ff, state);
- if ((error != APM_SUCCESS) && (error != APM_NO_ERROR))
- /* try to blank device one instead */
- error = set_power_state(0x101, state);
+
+ for (i = 0; i < ARRAY_SIZE(dev); i++) {
+ error = set_power_state(dev[i], state);
+
+ if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
+ return 1;
+
+ if (error == APM_NOT_ENGAGED)
+ break;
}
- if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
- return 1;
- if (error == APM_NOT_ENGAGED) {
+
+ if (error == APM_NOT_ENGAGED && state != APM_STATE_READY) {
static int tried;
int eng_error;
if (tried++ == 0) {