https://bugzilla.kernel.org/show_bug.cgi?id=58091
Summary: Backlight control regression on System 76 laptop with
Nvidia GPU
Product: ACPI
Version: 2.5
Kernel Version: 3.9.2
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: acpi_power-vi...@kernel-bugs.osdl.org
ReportedBy: bluesloth...@gmail.com
Regression: Yes
Created an attachment (id=101341)
--> (https://bugzilla.kernel.org/attachment.cgi?id=101341)
lspci -vvv output
The backlight controls worked fine with kernel version 3.8.12, and don't work
with 3.9.2. /sys/class/backlight is now empty.
I had this problem with 3.4.x too, and the "still use ACPI backlight control if
_DOS doesn't exist" patch in bug 43168 fixed it for me then.
In syslog, this line is there when I boot with 3.8.12, but not 3.9.2:
nouveau [ DRM] ACPI backlight interface available, not registering our own
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