https://bugzilla.novell.com/show_bug.cgi?id=300340#c8
--- Comment #8 from Holger Macht 2007-08-17 11:46:45 MST ---
Ok, the issue is known and already fixed in 2.6.23-rc3.
Quoting Henrique de Moraes Holschuh:
<quote>
Back to the problem... Basically, the firmware does not store in an EC
register the brightness level anymore. I can still read it from CMOS, so I
added a parameter to let the user choose what the driver should do, and made
it use only CMOS for Lenovo boxes. It seems to work on every lenovo box,
even those who still update the EC register like IBM thinkpads did.
How the firmware behaves depends on Lenovo thinkpad model and BIOS revision.
The thruth is, that Lenovo is moving brightness away from the thinkpad mode
to the generic ACPI mode in their models. As they update the BIOSes for the
older models, they would break as well (x60 is the last one that appears to
work in the old way).
</quote>
So to solve this issue, a lot more work and testing would be needed. I don't
know if it is worth the effort. Anyway, I'll attach a proof-of-concept patch
which is a backport of what is currently in 2.6.23 regarding the backlight.
I'll provide a mbuild next week to test.
--
Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.