I also have this problem with my HP 5320m, also upgraded from Maverick to Natty yesterday. I seem to have solved the xrandr problem by upgrading the kernel to 2.6.39-020639rc4-generic via the mainline kernel PPA: http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.39-rc4-natty/
Haven't tested it much yet, but it seems to be allowing me to use xrandr to use my external 1920x1080 LCD (with LVDS1 to the right, i.e. no mirrored) as I did on Maverick and Lucid before that.
I also have this problem with my HP 5320m, also upgraded from Maverick to Natty yesterday. I seem to have solved the xrandr problem by upgrading the kernel to 2.6.39- 020639rc4- generic via the mainline kernel PPA: http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v2.6.39- rc4-natty/
Haven't tested it much yet, but it seems to be allowing me to use xrandr to use my external 1920x1080 LCD (with LVDS1 to the right, i.e. no mirrored) as I did on Maverick and Lucid before that.
Hope that helps someone.