Re: Flickering with Intel i7-5700 (HD 5600) and Samsung 156HL01-102 panel

On 8 November 2015 at 19:05, Jordi Salvat i Alabart
<[email protected]> 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
> <[email protected]>:
>>
>> 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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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 },
 };

 /*
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