On Wednesday 24 October 2012, H. Peter Anvin wrote: > On 10/24/2012 02:16 PM, Ondrej Zary wrote: > > Some MSI laptop BIOSes are broken - INT 15h code uses port 92h to enable > > A20 line but resume code assumes that KBC was used. > > The laptop will not resume from S3 otherwise but powers off after a while > > and then powers on again stuck with a blank screen. > > > > Fix it by enabling A20 using KBC. Affected laptop list and DMI data are > > from bug reports at Ubuntu Launchpad. > > > > Also add kernel parameter to easily activate this quirk on any system. > > > > Only compile tested. The original patch was tested with EX600 and PR200. > > > > Fixes https://bugzilla.kernel.org/show_bug.cgi?id=12878 > > Are we guaranteed that this executes *before* the keyboard driver > initializes? If not, this needs to use the i8042 interface in the input > subsystem or at least acquire i8042_lock. > > -hpa The code is called in: start_kernel()->setup_arch()->acpi_boot_table_init() I think that it's before any drivers are initialized. -- Ondrej Zary -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
