This bug was fixed in the package linux-oem - 4.15.0-1024.29
---------------
linux-oem (4.15.0-1024.29) bionic; urgency=medium
* linux-oem: 4.15.0-1024.29 -proposed tracker (LP: #1797069)
* Keyboard backlight sysfs sometimes is missing on Dell laptops (LP: #1797304)
- platform/x86: dell-smbios: Correct some style warnings
- platform/x86: dell-smbios: Rename dell-smbios source to dell-smbios-base
- platform/x86: dell-smbios: Link all dell-smbios-* modules together
- [Config] CONFIG_DELL_SMBIOS_SMM=y, CONFIG_DELL_SMBIOS_WMI=y
- [Config] CONFIG_DELL_SMBIOS_SMM=y, CONFIG_DELL_SMBIOS_WMI=y
[ Ubuntu: 4.15.0-38.41 ]
* linux: 4.15.0-38.41 -proposed tracker (LP: #1797061)
* Silent data corruption in Linux kernel 4.15 (LP: #1796542)
- block: add a lower-level bio_add_page interface
- block: bio_iov_iter_get_pages: fix size of last iovec
- blkdev: __blkdev_direct_IO_simple: fix leak in error case
- block: bio_iov_iter_get_pages: pin more pages for multi-segment IOs
-- Chia-Lin Kao (AceLan) <acelan....@canonical.com> Tue, 16 Oct 2018
10:32:03 +0800
** Changed in: linux-oem (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1797304
Title:
Keyboard backlight sysfs sometimes is missing on Dell laptops
Status in HWE Next:
New
Status in linux package in Ubuntu:
Incomplete
Status in linux-oem package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Committed
Status in linux-oem source package in Bionic:
Fix Released
Bug description:
[Impact]
When the keyboard backlight sysfs is missing, userspace does not know
the current keyboard backlight brightness.
[Fix]
There's a loading order race condition, between the dell-smbios and its
backends, dell-smbios-{smm,wmi}.
Build them as one module can solve the issue.
The last patch is what we want, but pulls the entire series as a
whole.
[Test]
The backlight sysfs always exists with the patch. Userspace now knows
the current keyboard backlight brightness.
[Regression Potential]
Low. No functional change, as it simply links the modules together.
Limits to Dell machines.
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