A simple patch to fix APM assisted screen blanking (this at least fixes
a issue with the Geode LX BIOS). Reposted from before with no changes.
APM screen blanking fix.
This patch fixes screen blanking on BIOSes that return
APM_NOT_ENGAGED when APM enabled screen blanking is not
turned on.
Signed off by: Jordan Crouse <[email protected]>
---
arch/i386/kernel/apm.c | 27 ++++++++++++++-------------
1 files changed, 14 insertions(+), 13 deletions(-)
diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index 1e60acb..03e9d84 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -1075,22 +1075,23 @@ static int apm_engage_power_management(u
static int apm_console_blank(int blank)
{
- int error;
- u_short state;
+ int error, i;
+ u_short state;
+ 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 < 3; 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) {
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