I'm using 10.10 Maverick Meerkat, and can confirm that the keys for panel brightness work on my Lenovo Ideapad S10-3.
tom@netbook:~$ uname -a Linux netbook 2.6.35-27-generic #48-Ubuntu SMP Tue Feb 22 20:25:46 UTC 2011 x86_64 GNU/Linux
I'm using 10.10 Maverick Meerkat, and can confirm that the keys for panel brightness work on my Lenovo Ideapad S10-3.
tom@netbook:~$ uname -a
Linux netbook 2.6.35-27-generic #48-Ubuntu SMP Tue Feb 22 20:25:46 UTC 2011 x86_64 GNU/Linux