I too experience this. The only reason it occurs on ACPI events is the system automatically dims the display to conserve battery life; if the dim option is turned off then it doesn't happen. Thus this is not an ACPI event problem rather a problem with how the system dims the display.
I too experience this. The only reason it occurs on ACPI events is the system automatically dims the display to conserve battery life; if the dim option is turned off then it doesn't happen. Thus this is not an ACPI event problem rather a problem with how the system dims the display.