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. > > > > > 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
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