[Intel-gfx] Intel Arrandale IGDNG VGA issue

[CSJ]

Hello,

I got an issue on Intel Core i5 M540 with LG panel (Max resolution is
1920x1080).
That screen is fuzzy on the right area on Ubuntu as attached picture.

And after checking, the root cause is PLL setting in the Intel native
driver.
(drivers/gpu/drm/i915/intel_display.c)

in *intel_igdng_find_best_PLL* function, it goes to red lines,

                                                continue;
                                        this_err = abs((10000 -
(target*10000/clock.dot)));
                                        if (this_err < err_most) {
                                                *best_clock = clock;
                                                /* found on first matching
*/
                                                goto out;
                                        } else if (this_err < err_min) {
                                                *best_clock = clock;
                                                err_min = this_err;

and the clock settings before function return are:

clock.n=6
clock.m1=11
clock.m2=4
clock.p1=0
clock.p2=7
clock.dot=188571
clock.vco=1320000
clock.m=77
clock.p=7

the kernel version is 2.6.32.6 .

It will become terrible if I modify the clock setting manually(forcellu) to
the values that
from the the other machine with same chips but CMO panel (the screen is
normal).
(the CMO screen max resolution is 1600x900)

Is there any suggestion to tune the clock settings?
thanks a lot :)

CSJ
<changsijay at gmail.com>
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