Comment 49 for bug 1098216
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| Seth Forshee (sforshee) wrote Re: Regression in brightness control on Lenovo Thinkpad X230 and X1 Carbon | #49 |
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a60fb26
(Get the code!)
A couple of updates.
We've applied a patch for raring to quirk acpi_osi="!Windows 2012" for machines known to be affected by this bug. This isn't a long-term solution, but it will keep things working for the time being.
I'm also continuing to pursue a more permanent solution upstream. Towards that end, I've worked up a patch which simply disables use of the ACPI backlight which Windows 8 compatibility is being used. This does have a couple of drawbacks. While most machines should have another backlight interface available to use, some may not. Brightness adjustments using the hotkeys while in a VT are likely to no longer work as well. It will remain possible to work around both of these using acpi_osi="!Windows 2012".
I've posted a test build with the new patches at the link below. I'd appreciate any testing to validate that these changes on the various affected machines, and also validation that passing acpi_osi="!Windows 2012" in that build still restores the pre-Win8 behavior.
http://