From: Jani Nikula <jani.nikula@linux.intel.com>
To: "Mihai Donțu" <mihai.dontu@gmail.com>,
"Rodrigo Vivi" <rodrigo.vivi@gmail.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>,
"Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>,
dri-devel@lists.freedesktop.org
Subject: Re: i915: screen flicker
Date: Thu, 28 Apr 2016 11:02:13 +0300 [thread overview]
Message-ID: <87mvoei2ka.fsf@intel.com> (raw)
In-Reply-To: <20160427204207.640e5410@mdontu-l.dsd.bitdefender.biz>
On Wed, 27 Apr 2016, Mihai Donțu <mihai.dontu@gmail.com> wrote:
> On Wed, 27 Apr 2016 20:36:13 +0300 Mihai Donțu wrote:
>> 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.
>
> The behaviour is worse now. The screen flickers every couple of seconds.
Another report, please move the discussion there:
https://bugs.freedesktop.org/show_bug.cgi?id=95176
Thanks,
Jani.
>
>> > 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
--
Jani Nikula, Intel Open Source Technology Center
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prev parent reply other threads:[~2016-04-28 8:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-26 21:46 i915: screen flicker Mihai Donțu
2016-04-27 7:09 ` Jani Nikula
2016-04-27 10:07 ` Mihai Donțu
2016-04-27 10:35 ` Jani Nikula
2016-04-27 15:28 ` Rodrigo Vivi
2016-04-27 17:36 ` Mihai Donțu
2016-04-27 17:42 ` Mihai Donțu
2016-04-28 8:02 ` Jani Nikula [this message]
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