Lenovo T520: Present (-STABLE) vs. Future (-CURRENT) ACPI Support

[John Baldwin]

On Friday, December 26, 2014 11:57:31 am Bigby James wrote:
> Howdy-ha, folks,
> 
> Please forgive my ignorance if my question is rather mundane and/or inane. I'm
> pretty new to FreeBSD and its development cycle. Here's my situation: I've
> recently  migrated my laptop (Levovo Thinkpad T520) to FreeBSD using the
> 10.1-STABLE snapshot, and most everything works pretty well. The only
> exceptions are some of the hardware keys, including the LCD brightness control
> keys, which is something I'd really like to have.
> 
> Before going ahead with that install, though, on a lark I decided to try out the
> 11-CURRENT snapshot to see how it worked out. As it turns out, everything
> presently missing from 10-STABLE worked out of the box on -CURRENT. So I know
> that full support for my machine is in the source tree now and, barring any
> fundamental changes in the development branch, will be in the next -RELEASE. I
> don't really have the time, know-how or guts to maintain a -CURRENT install on
> this machine, so for the time being I'm sticking with 10-STABLE. So I'm
> wondering just how often ACPI functionality gets moved from the -CURRENT branch
> into the most recent release's -STABLE branch. In other words, what are the
> chances that the features I'm waiting for will get moved into the 10-STABLE
> branch in the near future? Are the ACPI devs pretty conservative with this? For
> the time being I can control screen brightness using xrandr, and as fond as I am
> with the convenience it is just a convenince all the same, so I can always
> remain patient. But I'm wondering if there's a way to know if and when ACPI
> functionality will get backported to -STABLE.  I currently follow this list and
> the SVN mailing list for 10-STABLE, so I can also just keep an eye on them if
> that's the answer.  Thanks in advance.

In the case of brightness hotkeys, please try MFC'ing 270516 to your stable/10
tree.  If that fixes it (it fixed brightness for my X220) then you know the specific
change to ask someone (in this case Adrian) to MFC.

-- 
John Baldwin