Comment 25 for bug 1690502

I see this in dmesg output on my Lenovo Yoga 2 11, BIOS 1.93 (latest) and N3520 processor:

snippet 1:
[ 1.811096] [Firmware Bug]: ACPI(PEGP) defines _DOD but not _DOS
[ 1.812306] ACPI: Video Device [PEGP] (multi-head: yes rom: no post: no)
[ 1.812316] ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL] Namespace lookup failure, AE_NOT_FOUND (20160831/psargs-359)
[ 1.812328] ACPI Error: Method parse/execution failed [\_SB.PCI0.RP01.PEGP.DD02._BCL] (Node ffffa0cbfb0e34d8), AE_NOT_FOUND (20160831/psparse-543)
[ 1.812643] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:17/LNXVIDEO:00/input/input6
[ 1.813856] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)

snippet 2:

[ 7.469149] thinkpad_acpi: ThinkPad ACPI Extras v0.25
[ 7.469152] thinkpad_acpi: http://ibm-acpi.sf.net/
[ 7.469153] thinkpad_acpi: ThinkPad BIOS 92CN93WW(V1.93), EC unknown
[ 7.469155] thinkpad_acpi: Lenovo Lenovo Yoga 2 11, model 20332
[ 7.473056] ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL] Namespace lookup failure, AE_NOT_FOUND (20160831/psargs-359)
[ 7.473195] ACPI Error: Method parse/execution failed [\_SB.PCI0.RP01.PEGP.DD02._BCL] (Node ffffa0cbfb0e34d8), AE_NOT_FOUND (20160831/psparse-543)
[ 7.473413] thinkpad_acpi: Standard ACPI backlight interface available, not loading native one
[ 7.474550] thinkpad_acpi: Console audio control enabled, mode: monitor (read only)

I read somewhere there a changes going on regarding the iasl compiler, but they may be old.
The messages do not seem to impact any functionality, since I did not see them on 4.8, but I do have this issue:
https://bugzilla.kernel.org/show_bug.cgi?id=109051

I guess it is unrelated and I mostly post to share if useful, if anyone thinks it's related I am interested to read how.