Help: Fedora15/Fedora 14 can not find the the DVD-ROM when install using Sata DVD-ROM drive and my BIOS was configured in IDE Mode for Intel Cougar Point 6GB/S port

[Focus.Luo]

Hi all,
Fedora15/Fedora 14 can not find the the DVD-ROM when install using Sata DVD-ROM drive and my BIOS was configured in IDE mode for Intel Cougar Point Sata controller on Sata 6GB/S port.
But when I changed  the sata 6Gb/s port from IDE mode to AHCI mode on my BIOS, the Fedora15/Fedora 14 can be installed successly.
And I alse do a test on changing the DVD-ROM to the sata 3GB/s port and keep the sata controller on IDE mode,  the Fedora15/14 can also be installed successly.
I  also have done an other test, I try to install RHEL 6.0 on the sata 6GB/s port and keep the sata controller on IDE mode , and I also have the right result. 
So, it is my BIOS have a bug? or Fedora15/14 can not be installed on sata 6GB/s port when the sata controller is configured in IDE mode? or there is a bug on linux kernel(RHEL6.0 kernel:2.6.32, FC15 kernel:2.6.40)?
Someone can help me.
thanks.

My computer:  cpu: intel sandy brige(i5 2500),   pch: intel cougar point(QM67)