Re: "Setting old previous keyboard state failed" error on Dell E7270
From: Takashi Iwai
Date: Thu Nov 17 2016 - 09:34:02 EST
On Thu, 17 Nov 2016 13:19:16 +0100,
Pali RohÃr wrote:
> On Thursday 17 November 2016 12:27:33 Takashi Iwai wrote:
> > Hi,
> > I noticed that a new machine I got yesterday, Dell Latitude E7270,
> > always shows the error at boot time:
> > dell_laptop: Setting old previous keyboard state failed
> > From what I read from the code, it seems non-fatal. But is it a way
> > to "fix" it?
> > Or shouldn't we simply lower the printk level?
> > thanks,
> > Takashi
> Hi! Month ago I got private email about same problem reported by user.
> Looks like that Dell changed SMBIOS interface for keyboards and have not
> notified about it... User wrote that will do some research and write
> info to mailing list.
> So in this case it is not non-fatal warning, but warning which telling
> us: "you are doing some operation which we do not know what is doing
> Masking this warning is not a good idea. There are only two good
> 1) Fix the code so it will work with that changed SMBIOS interface
> 2) Disable that code on problematic machines.
> Anyway, keyboard backlight control in kernel is implemented from program
> smbios-keyboard-ctl provided and supported by Dell. I do not see any
> update to that program in upstream git repository.
I'll give it a try shortly later.
> So there are two options what could happen:
> 1) smbios-keyboard-ctl is working and kernel code not -- in this case
> bug in kernel, please provide debug logs from both smbios-keyboard-ctl
> and kernel and I could try to look at it
> 2) smbios-keyboard-ctl is not working too -- in this case please report
> bug to that libsmbios project and Dell needs to fix it