http://bugzilla.kernel.org/show_bug.cgi?id=10285
Summary: backlight is gone in X after closing/reopening the lid
Product: ACPI
Version: 2.5
KernelVersion: 2.6.25-rc6
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
OtherBugsDependingO 9832
nThis:
Regression: 1
Latest working kernel version: 2.6.25-rc5
Earliest failing kernel version: 2.6.25-rc6
HW: Thinkpad X60
Steps to reproduce:
start X, close lid, reopen it, backlight flashes and then it is gone... making
machine unusable until X are exited.
This revert of 9832 fixes it:
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 7222a18..caf873c 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -943,7 +943,11 @@ int __init acpi_ec_ecdt_probe(void)
boot_ec->command_addr = ecdt_ptr->control.address;
boot_ec->data_addr = ecdt_ptr->data.address;
boot_ec->gpe = ecdt_ptr->gpe;
- boot_ec->handle = ACPI_ROOT_OBJECT;
+ if (ACPI_FAILURE(acpi_get_handle(NULL, ecdt_ptr->id,
+ &boot_ec->handle))) {
+ pr_info("Failed to locate handle for boot EC\n");
+ boot_ec->handle = ACPI_ROOT_OBJECT;
+ }
} else {
/* This workaround is needed only on some broken machines,
* which require early EC, but fail to provide ECDT */
--
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