On Sun, Feb 23, 2014 at 01:52:14PM +0100, haiko wrote: > Hello developers! > > I recently updated my Arch installation from linux-3.12.9 to linux-3.13.4. > Unfortunately my X230's brightness fn-keys don't work anymore. > > There is a message during boot referring to an unsupported brightness > interface. It also asks to post the issue on this mailing list (so > here I am (-: ). > > The relevant part of dmesg: > [ 1.851488] thinkpad_acpi: ThinkPad ACPI Extras v0.25 > [ 1.851490] thinkpad_acpi: http://ibm-acpi.sf.net/ > [ 1.851492] thinkpad_acpi: ThinkPad BIOS G2ET92WW (2.52 ), EC unknown > [ 1.851493] thinkpad_acpi: Lenovo ThinkPad X230, model 2324CTO > [ 1.852048] thinkpad_acpi: Unsupported brightness interface, please > contact ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx > [ 1.853009] thinkpad_acpi: radio switch found; radios are enabled > [ 1.853115] thinkpad_acpi: This ThinkPad has standard ACPI > backlight brightness control, supported by the ACPI video driver > [ 1.853117] thinkpad_acpi: Disabling thinkpad-acpi brightness > events by default... > [ 1.860287] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio > is unblocked > [ 1.860772] thinkpad_acpi: Console audio control enabled, mode: > monitor (read only) > > I attached the entire dmesg output in case you need it. > > I tried the following boot options without effect: > video.use_native_backlight=1 > acpi_osi=Linux acpi_backlight=vendor > acpi_osi=Linux acpi_backlight=legacy > acpi_osi="!Windows 2012" acpi_backlight=vendor > > ls /sys/class/backlight/ outputs: > acpi_video0 intel_backlight > > I hope this is helpful. You might want to take a look at [1]. I guess some of the patches finally went into 3.13. I have an x230 at work but I won't be able to test it before next week. It might be wise to test without any boot option. Also note that the final outcome might just be that you *need* something in userspace to handle the brightness keys… [1]: https://bugzilla.kernel.org/show_bug.cgi?id=51231 Regards, -- Yves-Alexis
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