Same here, Toshiba Satellite M70 (i915, Hitachi SATA I disk w/NCQ), Intrepid 2.6.27-3. Moving to -4 kernel makes system completely unstable and unusable, kernel reports I/O errors on the hard disk. When kernel -3 with all_generic_ide option is used there are lockups too, but soft ones only.
Same here, Toshiba Satellite M70 (i915, Hitachi SATA I disk w/NCQ), Intrepid 2.6.27-3. Moving to -4 kernel makes system completely unstable and unusable, kernel reports I/O errors on the hard disk. When kernel -3 with all_generic_ide option is used there are lockups too, but soft ones only.