This message is a reminder that Fedora 27 is nearing its end of life. If someone else wants to try the patched kernel it can be downloaded from here (F27, x86_64) So, conclusions: as Hans said I confirm that his patch is not the cause of backlit issues, but also that I was unable to reproduce any issue with the current v4.16 tree (as Mario Limonciello from Dell suggested in the mail exchange). 1) 2) and 3) frequent backlit errors, I would say at every reboot and often during cold boots Ok, I made more than hundred reboots/cold boots in the last 24 hrs with the following kernels:ġ) kernel-4.15.86_64 (official from fedora-updates)Ģ) kernel-4.15.86_64 (official from fedora-updates)ģ) kernel-4.15.86_64 (with Hans' patch removed)Ĥ) kernel-4.15.86_64 (with patches backported from v4.16rc2)ĥ) kernel-4.16.0.1.fc28.x86_64 (from fedora 28) "Pali Rohár" (maintainer:DELL LAPTOP DRIVER)ĭarren Hart (maintainer:X86 PLATFORM DRIVERS)Īndy Shevchenko (maintainer:X86 PLATFORM DRIVERS) It might be best to report this upstream linux]$ scripts/get_ -f drivers/platform/x86/dell-laptop.c I guess the dispatcher stuff may have introduced some bugs :| platform/x86: dell-smbios: Introduce dispatcher for SMM calls Mario Limonciellođ -178/+105 platform/x86: dell-laptop: Allocate buffer before rfkill use Mario Limonciellođ -4/+5 platform/x86: dell-laptop: fix error return code in dell_init() weiyongjun (A)đ -1/+3 platform/x86: dell-laptop: Fix keyboard max lighting for Dell Latitude E6410 Pali Rohárđ -0/+17 The dell-laptopĬode in 4.15 has the following commits which are not in 4.14: Otherwise this sounds like a regression introduced in 4.15. Thank you for testing, one thing which could cause race conditions I guess is userspace smbios access, you said before that you did smbios-keyboard-ctl, so you've the (mostly obsolete) userspace tools installed, maybe these come with some boot-time service which accesses the smbios? I'll keep the situation monitored in the next days and report you the feedback. No issues, even if I discovered that it also include your patch Ĭould be a kind of race condition issue? Like the kernel trying to play with SMI when not ready yet? There's any specific test that I can run? kernel-4.15.86_64 without your patchĭidn't tried yet because I accidentally removed it and I need to recompile it I also see in the journal errors like this Never got the "dell_laptop: Setting old previous keyboard state failed", but sometime I get the same error above Kernel: dell_smbios: No dell-smbios drivers are loaded Produced the "dell_laptop: Setting old previous keyboard state failed" 1/3 of the times (and the backlit was switched off) and sometime produced the error You are probably right that there's no strict correlation, at least not a direct one, with the patch (see also last point) I did many reboots in the last 30 minutes doing both cold and hot boot, with and without AC.
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