Please ignore my #4 and #5 comments.
With the use of v3.18-rc3-vivid, for the following problems:
1. After every boot, the brightness is set to maximum.
2. The brightness can't be adjusted smoothly. Only 4 brightnesses can be
achieved with Fn keys.
3. After recovering from screen dimming and system suspend, the brightness is
set to maximum.
4. The following error message is printed during the boot:
thinkpad_acpi: Unsupported brightness interface, please contact
ibm-acpi-de...@lists.sourceforge.net
2 and 3 are fixed. But 1 and 4 still exist.
** Tags removed: kernel-bug-exists-upstream
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https://bugs.launchpad.net/bugs/1388817
Title:
Backlight brightness problem with Thinkpad T440S
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