ACPI(MXM3) defines _DOD but not _DOS [Firmware Bug]: ACPI: No _BQC method, cannot determine initial brightness

[Jagat]

Get following messages in syslog

13.10

Oct 12 12:24:31 nanak-P570WM kernel: [ 13.945417] [Firmware Bug]: ACPI(MXM3) defines _DOD but not _DOS
Oct 12 12:24:31 nanak-P570WM kernel: [ 13.945488] [Firmware Bug]: ACPI: No _BQC method, cannot determine initial brightness

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: acpi 1.6-1
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
Date: Sat Oct 12 12:30:32 2013
Dependencies:
 gcc-4.8-base 4.8.1-10ubuntu7
 libc6 2.17-93ubuntu1
 libgcc1 1:4.8.1-10ubuntu7
 multiarch-support 2.17-93ubuntu1
InstallationDate: Installed on 2013-09-05 (36 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130904)
MarkForUpload: True
SourcePackage: acpi
UpgradeStatus: No upgrade log present (probably fresh install)