[Bug 32556] screen flickers all the time with desktop image appearing only briefly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=32556

--- Comment #12 from Gildas Le Nadan <3ntr0p13 at gmail.com> 2010-12-22 13:48:56 PST ---
(In reply to comment #9)
> With the patch from comment 8, try these possible fixes:
> 
> diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
> b/drivers/gpu/drm/radeon/atombios_crtc.c
> index b0ab185..0be8015 100644
> --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> @@ -525,7 +525,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
>                     (rdev->family == CHIP_RS690) ||
>                     (rdev->family == CHIP_RS740))
>                         pll->flags |= (/*RADEON_PLL_USE_FRAC_FB_DIV |*/
> -                                      RADEON_PLL_PREFER_CLOSEST_LOWER);
> +                                      RADEON_PLL_PREFER_CLOSEST_HIGHER);
> 
>                 if (ASIC_IS_DCE32(rdev) && mode->clock > 200000)        /*
> range limits??? */
>                         pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
> 
> Or:
> 
> diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
> b/drivers/gpu/drm/radeon/atombios_crtc.c
> index b0ab185..91facc8 100644
> --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> @@ -525,7 +525,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
>                     (rdev->family == CHIP_RS690) ||
>                     (rdev->family == CHIP_RS740))
>                         pll->flags |= (/*RADEON_PLL_USE_FRAC_FB_DIV |*/
> -                                      RADEON_PLL_PREFER_CLOSEST_LOWER);
> +                                      RADEON_PLL_NO_ODD_POST_DIV);
> 
>                 if (ASIC_IS_DCE32(rdev) && mode->clock > 200000)        /*
> range limits??? */
>                         pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;

None of the proposed solutions fix the problem for good although there is some
improvement over the flickering frequency.

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