i915: screen flicker

[Mihai Donțu]

On Wed, 27 Apr 2016 08:28:20 -0700 Rodrigo Vivi wrote:
> Hi Mihai,
> 
> What platform do you have? HSW or BDW?

I have an i7, Haswell CPU.

> If you don't know please provide lspci -nn

I have attached the output of lspci, just in case. :-)

> What happens if you boot with i915.enable_psr=2?

I'll try now.

> In case it helps, could you please boot with default
> i915.enable_psr=-1 appying this patch to your kernel to know what your
> VBT recommends:
> diff --git a/drivers/gpu/drm/i915/intel_psr.c
> b/drivers/gpu/drm/i915/intel_psr.c
> index c3abae4..68bc405 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -798,6 +798,8 @@ void intel_psr_init(struct drm_device *dev)
>                 /* For new platforms let's respect VBT back again */
>                 dev_priv->psr.link_standby =
> dev_priv->vbt.psr.full_link;
> 
> +       DRM_ERROR("PSR: VBT recommends link_standby %d, using %d\n",
> dev_priv->vbt.psr.full_link, dev_priv->psr.link_standby);
> +
>         /* Override link_standby x link_off defaults */
>         if (i915.enable_psr == 2 && !dev_priv->psr.link_standby) {
>                 DRM_DEBUG_KMS("PSR: Forcing link standby\n");
> 

I applied your patch and booted with enable_psr=-1

[    0.763651] [drm:intel_psr_init] *ERROR* PSR: VBT recommends link_standby 0, using 0

-- 
Mihai Donțu
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