https://bugzilla.kernel.org/show_bug.cgi?id=26552





--- Comment #44 from Helber Maciel Guerra <helbe...@gmail.com>  2011-02-11 
19:41:42 ---
(In reply to comment #42)
> Helber, can you try the following patch instead of the two patches linked
> above?
> 
> diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
> b/drivers/gpu/drm/radeon/atombios_crtc.c
> index cc6bdd8..2f9d113 100644
> --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> @@ -562,7 +562,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
>                                 }
>                         }
>  /* this might work properly with the new pll algo */
> -#if 0 /* doesn't work properly on some laptops */
> +#if 1 /* doesn't work properly on some laptops */
>                         /* use recommended ref_div for ss */
>                         if (radeon_encoder->devices &
> (ATOM_DEVICE_LCD_SUPPORT)) {
>                                 if (ss_enabled) {

This patch work well.
Tanks, Helber Maciel Guerra.

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