[ltp] Re: Thinkpad **30 series, Linux 3.7 and brightness keys

Chow Loong Jin linux-thinkpad@linux-thinkpad.org
Fri, 05 Apr 2013 11:27:42 +0800

On 05/04/2013 11:03, Dave Cunningham wrote:
> I have a W520 (just issued by IBM as my new work laptop).  I installed Ubuntu
> Quantal on it, which comes with a 3.5.0 kernel, and use of the brightness up key
> yields a very low-level hang that needs a power cycle to fix.
> I also tried 3.8.5 and it was the same.
> I tried upgrading the bios and EC but that didn't help.  I'm currently at 8BET60WW.
> I also notice hibernate and suspend don't work properly, but this could be due
> to other reasons.
> Any known workarounds?

On my E220S, I had to disable X2APIC by booting with the 'nox2apic' kernel
command line argument. Try doing that and seeing if that helps.

Kind regards,
Loong Jin