https://bugzilla.kernel.org/show_bug.cgi?id=77091
Bug ID: 77091
Summary: brightness changes to minimum on AC plug/unplug and
whenever thinkpad_acpi detects EC Thermal Table has
changed
Product: ACPI
Version: 2.5
Kernel Version: 3.15-rc7
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Lenovo Thinkpad T540p , 2 video cards, running vanilla kernel.
steps to reproduce:
adjust brightness by F5/F6 to a suitable value.
plug or unplug a power cord
brightness is dropped to a minimum value.
Expected behavior - brightness doesn't change
Every plug/unplug causes the kernel to emit:
May 29 14:18:22 r9-008cln kernel: thinkpad_acpi: EC reports that Thermal Table
has changed
These events happen sometimes w/o AC plug/unplug. Every time this event
happens, the brightness is dropped to a minimum value. They can go in series of
5-6 in a row.
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