Problem is related to the kernel. I went back to 2.6.32 and without the options snd-hda-intel line, tinny sound. But when I add that line (including model=lenovo-sky), the sound works great! So, 10.10 with 2.6.32 kernel has same behavior as 10.04.
This bug might be related (same Realtek ALC888 driver): https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/617647
Problem is related to the kernel. I went back to 2.6.32 and without the options snd-hda-intel line, tinny sound. But when I add that line (including model=lenovo-sky), the sound works great! So, 10.10 with 2.6.32 kernel has same behavior as 10.04.
This bug might be related (same Realtek ALC888 driver): https:/ /bugs.launchpad .net/ubuntu/ +source/ alsa-driver/ +bug/617647