Re: i915: screen flicker

["Mihai Donțu" <mihai.dontu@gmail.com>]

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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

[-- Attachment #2: lspci.txt --]
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00:00.0 Host bridge [0600]: Intel Corporation Haswell-ULT DRAM Controller [8086:0a04] (rev 0b)
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b)
00:03.0 Audio device [0403]: Intel Corporation Haswell-ULT HD Audio Controller [8086:0a0c] (rev 0b)
00:14.0 USB controller [0c03]: Intel Corporation 8 Series USB xHCI HC [8086:9c31] (rev 04)
00:16.0 Communication controller [0780]: Intel Corporation 8 Series HECI #0 [8086:9c3a] (rev 04)
00:16.3 Serial controller [0700]: Intel Corporation 8 Series HECI KT [8086:9c3d] (rev 04)
00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection I218-LM [8086:155a] (rev 04)
00:1b.0 Audio device [0403]: Intel Corporation 8 Series HD Audio Controller [8086:9c20] (rev 04)
00:1c.0 PCI bridge [0604]: Intel Corporation 8 Series PCI Express Root Port 1 [8086:9c10] (rev e4)
00:1c.3 PCI bridge [0604]: Intel Corporation 8 Series PCI Express Root Port 4 [8086:9c16] (rev e4)
00:1d.0 USB controller [0c03]: Intel Corporation 8 Series USB EHCI #1 [8086:9c26] (rev 04)
00:1f.0 ISA bridge [0601]: Intel Corporation 8 Series LPC Controller [8086:9c43] (rev 04)
00:1f.2 SATA controller [0106]: Intel Corporation 8 Series SATA Controller 1 [AHCI mode] [8086:9c03] (rev 04)
00:1f.3 SMBus [0c05]: Intel Corporation 8 Series SMBus Controller [8086:9c22] (rev 04)
02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73)

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