[Mesa-users] Flickering with Intel i7-5700 (HD 5600) and Samsung 156HL01-102 panel

[Albert Freeman]

On 10 November 2015 at 13:10, Albert Freeman <albertwdfreeman at gmail.com> wrote:
> On 8 November 2015 at 19:05, Jordi Salvat i Alabart
> <jordi.salvat.i.alabart at gmail.com> wrote:
>> Noone? Not even a hint on where I could ask for help?
>>
>> :'-(
>>
>>
>>
>> 2015-10-26 0:18 GMT+01:00 Jordi Salvat i Alabart
>> <jordi.salvat.i.alabart at gmail.com>:
>>>
>>> Hi,
>>>
>>> My new MSI PE60 2QE laptop mounts an Intel i7-5700HQ, which carries the
>>> Integrated Graphics Chipset 5600, and a Samsung 156HL01-102 panel.
>>>
>>> The display works perfectly when I boot with the "nomodeset" parameter in
>>> the kernel command line -- but then I'm forced to use the framebuffer
>>> driver, which doesn't allow multiple monitors.
>>>
>>> With KMS enabled (by removing the "nomodeset" parameter), X starts
>>> correctly with the "intel" driver and I can use multiple monitors, but the
>>> laptop's panel shows an irregular flicker, ranging from occasional
>>> flickering horizontal black lines (which are really annoying) to a constant
>>> flashing & flickering making the display all but unusable.
>>>
>>> The flickering and flashing is less noticeable, but still there, in the
>>> text-mode VTs, even if I never start X. So the problem has to be in the
>>> kernel or modules, not in the X drivers.
>>>
>>> External monitors connected to the DP or HDMI ports don't show any
>>> flickering.
>>>
>>> Things I have tried (among many others I've discovered were irrelevant):
>>>
>>> Setting a number different video modes using xrandr
>>> Booting with Kernel 3.19.0.25 with i915.enable_IPS=0 as suggested here:
>>> Screen flickering on Ubuntu Gnome 14.04 - 4K resolution
>>> Booting with i915.powersave=0
>>> Booting with acpi_osi=Linux
>>> Upgrading to Ubuntu Vivid Vervet (kernel 3.19.0 with a backported i915
>>> module)
>>> Upgrading to Ubuntu Willy Werewolf (kernel 4.2.0)
>>>
>>> None of these have helped.
>>>
>>> I'm attaching kern.log for a full boot sequence with drm.debug=0xf.
>>>
>>> What steps can you recommend to try to diagnose and solve this problem?
>>>
>>> Thanks a lot for your help,
>>>
>>> Jordi
>>>
>>
>>
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>> mesa-users at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/mesa-users
>>
> Does this solve the issue (it solves a issue with your monitor) (it is
> applied ontop of the latest linus kernel tree at time of writing):
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 05bb731..44c9422 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -139,6 +139,9 @@ static struct edid_quirk {
>
>         /* Panel in Samsung NP700G7A-S01PL notebook reports 6bpc */
>         { "SEC", 0xd033, EDID_QUIRK_FORCE_8BPC },
> +
> +       /* Panel in Samsung 156HL01-102 display (for notebook) reports
> 6bpc instead of 8bpc */
> +       { "SDC", 0x324c, EDID_QUIRK_FORCE_8BPC },
>  };
>
>  /*
>
>
>
> !!!OR!!! Since the DRM is trying to force part of your monitor into 36
> bit mode, maybe this:
>
>
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 05bb731..44c9422 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -139,6 +139,9 @@ static struct edid_quirk {
>
>         /* Panel in Samsung NP700G7A-S01PL notebook reports 6bpc */
>         { "SEC", 0xd033, EDID_QUIRK_FORCE_8BPC },
> +
> +       /* Panel in Samsung 156HL01-102 display (for notebook) reports
> 6bpc instead of 12bpc */
> +       { "SDC", 0x324c, EDID_QUIRK_FORCE_12BPC },
>  };
>
>  /*
Sorry those patches don't apply properly, here are ones that do
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