> -----Original Message----- > From: Pali Rohár <pali.rohar@xxxxxxxxx> > Sent: Sunday, September 22, 2019 8:43 AM > To: Pacien TRAN-GIRARD > Cc: Matthew Garrett; Darren Hart; Andy Shevchenko; platform-driver- > x86@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Limonciello, Mario > Subject: Re: [PATCH] platform/x86: dell-laptop: fix phantom kbd backlight on > Inspiron 10xx > > On Wednesday 18 September 2019 17:29:15 Pacien TRAN-GIRARD wrote: > > Quoting Pali Rohár (2019-09-12 09:33:58) > > > On Thursday 12 September 2019 01:14:48 Pacien TRAN-GIRARD wrote: > > > > This patch registers a quirk disabling keyboard backlight support > > > > for the Dell Inspiron 1012 and 1018. > > > > > > > > Those models wrongly report supporting the KBD_LED_OFF_TOKEN and > > > > KBD_LED_ON_TOKEN SMBIOS tokens, exposing keyboard brightness > > > > controls through sysfs which freeze the system when used. > > > > > > > > The associated SMBIOS calls never return and cause the system to > > > > hang, notably at boot when systemd-backlight tries to restore > > > > previous brightness settings. > > > > > > Hi! This sounds like a firmware bug. Have you already reported it to Dell? > > > > Yes, the issue has been reported to Dell's technical support, which > > didn't provide a satisfying answer. > > There were already some firmware problems with keyboard backlight and Mario > posted this comment about Linux support: > https://github.com/dell/libsmbios/issues/48#issuecomment-391328501 > > Can you try to use libsmbios tools and if they do not work too, report problem > also there? > > > I'm not familiar with Dell's policy, but I doubt that they would issue > > a BIOS update for discontinued models from 2010. > > We need to wait what Mario wrote about this particular problem. > I agree an Inspiron is unlikely to be updated 9 years later. I think the right thing to do in this instance is to blacklist this particular platform in kernel driver. > > > > > > > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=107651 > > > > Signed-off-by: Pacien TRAN-GIRARD <pacien.trangirard@xxxxxxxxxx> > > > > > > -- > > > Pali Rohr > > > pali.rohar@xxxxxxxxx > > > > -- > > Pacien TRAN-GIRARD <pacien.trangirard@xxxxxxxxxx> > > -- > Pali Rohár > pali.rohar@xxxxxxxxx
