Hello,<br><br>I got an issue on Intel Core i5 M540 with LG panel (Max resolution is
1920x1080).<br>
That screen is fuzzy on the right area on Ubuntu as attached picture.<br>
<br>
And after checking, the root cause is PLL setting in the Intel native
driver.<br>
(drivers/gpu/drm/i915/intel_display.c)<br>
<br>
in <i>intel_igdng_find_best_PLL</i> function, it goes to red lines,<br>
<br>
                                                continue;<br>
                                        this_err = abs((10000 -
(target*10000/clock.dot)));<br>
                                        if (this_err < err_most) {<br>
                                                *best_clock = clock;<br>
                                                /* found on first
matching */<br>
                                                goto out;<br>
                                        } <font color="#ff0000">else
if (this_err < err_min) {<br>
                                                *best_clock = clock;<br>
                                                err_min = this_err;</font><br>
<br>
and the clock settings before function return are:<br>
<blockquote>clock.n=6<br>
clock.m1=11<br>
clock.m2=4<br>
clock.p1=0<br>
clock.p2=7<br>
clock.dot=188571<br>
clock.vco=1320000<br>
clock.m=77<br>
clock.p=7<br>
</blockquote>
the kernel version is 2.6.32.6 .<br>
<br>
It will become terrible if I modify the clock setting manually(forcellu) to the values
that<br>
from the the other machine with same chips but CMO panel (the screen is
normal).<br>
(the CMO screen max resolution is 1600x900)<br>
<br>
Is there any suggestion to tune the clock settings?<br>thanks a lot :)<br><br>CSJ<br><<a href="mailto:changsijay@gmail.com">changsijay@gmail.com</a>><br>