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Message-ID: <5218CC69.6090108@petermann-it.de>
Date: Sat, 24 Aug 2013 17:08:25 +0200
From: Matthias Petermann <matthias@petermann-it.de>
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To: bug-followup@FreeBSD.org, matthias@petermann-it.de, 
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Subject: Re: amd64/181357: LCD Brightness Control not working on Lenovo X121e
 (ACPI issue?)
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Hello,

regarding this PR I made some further observation. Even the 
acpi_ec_write seems to not have any effect on the brightness, the values 
set to the appropriate register (IBM_EC_BRIGHTNESS   0x31) survive a 
reboot.

Looks like the values are stored correctly, but EC doesn't care for them 
when setting brightness?

I'm not sure where to look next. Could this be a hardware issue with the 
Device?

Kind regards,
Matthias