maemo.org - Talk - Reducing LCD pixel clock

I tried reducing the LCD's pixel clock to 12000, in the hopes it would halve the refresh rate (both reducing required memory bandwidth, and hopefully tearing).

Unfortunately the device reboots as it tries to load Xorg, though seems to work up to that point (with framebuffer console enabled).

I'm using these timings:

Code:

        .timings = {

                .x_res = 800,

                .y_res = 480,



                .pixel_clock    = 12000,



                .hsw            = 4,

                .hfp            = 28,

                .hbp            = 24,



                .vsw            = 3,

                .vfp            = 3,

                .vbp            = 4,

        },

Do I need to adjust the porches or hsw/vsw (sync?) as well? Is something else hardcoded to expect the pixel clock to be 24000?