[Bug 82829] New: [915 Color] Intel Haswell GPU HD4400 has wrong color management on external screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82829

          Priority: medium
            Bug ID: 82829
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [915 Color] Intel Haswell GPU HD4400 has wrong color
                    management on external screen
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: timshel at rocketmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 104922
  --> https://bugs.freedesktop.org/attachment.cgi?id=104922&action=edit
dmesg with drm.debug=0x0e of monitor with wrong colors

I have a weird graphic issue that if I connect my laptop to my external screen,
a Samsung PX2370, the colors on the external one have a low contrast and it
looks like if the gamma value is way to high. Black is grey and so on.

This happens independently if I use a VGA or digital connection via
Displayport.

In grub 2 and before KMS is started the background is in regular black but as
soon as KMS starts the backrgound becomes grey. If I disable KMS via the kernel
parameter "nomodeset" the booting shows normal contrast until X is started,
then everything is in low contrast again.

If I connect my laptop to another monitor the issue doesn't happen.

But the PX2370 can't be the only source of the issue since I never had this
problem before with my previous laptop and if I connect another PC to the
PX2370 and boot the same distribution the colors are also normal.

I am using openSUSE Factory with the following versions:

xf86-video-intel-2.99.914-1.1.x86_64
xorg-x11-server-7.6_1.16.0-4.1.x86_64
Mesa-10.2.5-89.1.x86_64
kernel-desktop-3.16.0-1.1.x86_64

My laptop is a T440s with a i7-4600U.

Let me know, if you need any additional information.

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