Regression in v4.8-rc4: i915 flickering since commit 1c80c25fb6

Regression in v4.8-rc4: i915 flickering since commit 1c80c25fb6

[Dominik Brodowski]

Hi!

Since commit 1c80c25fb6 (determined by git bisect, and confirmed by
reverting this patch on top of 9ca581b50d), the sceen on my DELL XPS 13
is flickering every once in a while (sometimes multiple times per
second, sometimes only every few seconds).

That's for

00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Dell Device 0665
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 42
        Region 0: Memory at f6000000 (64-bit, non-prefetchable) [size=16M]
        Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at f000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915

and Debian Jessie userland.

Best,
	Dominik
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Re: Regression in v4.8-rc4: i915 flickering since commit 1c80c25fb6

[Jani Nikula]

On Sun, 04 Sep 2016, Dominik Brodowski <linux@dominikbrodowski.net> wrote:
> Hi!
>
> Since commit 1c80c25fb6 (determined by git bisect, and confirmed by
> reverting this patch on top of 9ca581b50d), the sceen on my DELL XPS 13
> is flickering every once in a while (sometimes multiple times per
> second, sometimes only every few seconds).

*sigh* another PSR issue.

commit 1c80c25fb622973dd135878e98d172be20859049
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed May 18 18:47:12 2016 +0200

    drm/i915/psr: Make idle_frames sensible again

Please file a bug at [1].

BR,
Jani.

[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel


>
> That's for
>
> 00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09) (prog-if 00 [VGA controller])
>         Subsystem: Dell Device 0665
>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
>         Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>         Latency: 0
>         Interrupt: pin A routed to IRQ 42
>         Region 0: Memory at f6000000 (64-bit, non-prefetchable) [size=16M]
>         Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
>         Region 4: I/O ports at f000 [size=64]
>         [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
>         Capabilities: <access denied>
>         Kernel driver in use: i915
>
> and Debian Jessie userland.
>
> Best,
> 	Dominik

-- 
Jani Nikula, Intel Open Source Technology Center
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Re: Regression in v4.8-rc4: i915 flickering since commit 1c80c25fb6

[Vivi, Rodrigo]

On Wed, 2016-09-07 at 15:37 +0300, Jani Nikula wrote:
> On Sun, 04 Sep 2016, Dominik Brodowski <linux@dominikbrodowski.net> wrote:
> > Hi!
> >
> > Since commit 1c80c25fb6 (determined by git bisect, and confirmed by
> > reverting this patch on top of 9ca581b50d), the sceen on my DELL XPS 13
> > is flickering every once in a while (sometimes multiple times per
> > second, sometimes only every few seconds).
> 
> *sigh* another PSR issue.

https://patchwork.kernel.org/patch/9121361/ 

Rodrigo Vivi - May 25, 2016, 10:52 p.m. "Hm, I believe this is
dangerous..."


> commit 1c80c25fb622973dd135878e98d172be20859049
> Author: Daniel Vetter <daniel.vetter@ffwll.ch>
> Date:   Wed May 18 18:47:12 2016 +0200
> 
>     drm/i915/psr: Make idle_frames sensible again
> 
> Please file a bug at [1].
> 
> BR,
> Jani.
> 
> [1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel
> 
> 
> >
> > That's for
> >
> > 00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09) (prog-if 00 [VGA controller])
> >         Subsystem: Dell Device 0665
> >         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
> >         Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
> >         Latency: 0
> >         Interrupt: pin A routed to IRQ 42
> >         Region 0: Memory at f6000000 (64-bit, non-prefetchable) [size=16M]
> >         Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
> >         Region 4: I/O ports at f000 [size=64]
> >         [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
> >         Capabilities: <access denied>
> >         Kernel driver in use: i915
> >
> > and Debian Jessie userland.
> >
> > Best,
> > 	Dominik
> 

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