Nouveau - Apr 2018 - [Bug 105977] New: Samsung screen replacement in a Dell laptop brings corrupted display

https://bugs.freedesktop.org/show_bug.cgi?id=105977

            Bug ID: 105977
           Summary: Samsung screen replacement in a Dell laptop brings
                    corrupted display
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: robertk at mailsac.com
        QA Contact: xorg-team at lists.x.org

Created attachment 138747
  --> https://bugs.freedesktop.org/attachment.cgi?id=138747&action=edit
screenshots

1) Tested on Ubuntu 14.04, 16.04, 17.10, Debian 8, Tails (0.2,...,6.2), Kali...
and some other Linux distributions.

2) The computer is a Dell laptop with a built-in NVIDIA Quadro FX 2500M
(identified as NVIDIA Corporation G71GLM)

3) Kernel driver in use: nouveau

4) Everything was worked fine using the nouveau driver but someday the screen
backlight failed and I have to replace the broken WUXGA+ screen with a new one,
same specifications except is a glossy screen (not matte). The screen product
numbers are almost identical (New screen: Samsung LTN170U1-L02, Old one:
Samsung LTN170U1-L01).

5) With the new screen installed the display is corrupted as it shows in the
attached pictures. The vertical resolution (1200px) seems to be fine but the
horizontal pixels (1920x) are distributed doubling the width (the right half
out of the screen). The desktop is chopped and the screen is full of scan
flicks, errors and artifacts.

6) No issues using NVIDIA propietary driver.

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--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
If "vertical" is OK, that means the screen is OK and nouveau's
modesetting is
OK. (The rotation is purely software, it's still a 1920x1200 framebuffer.)

Could something else have gotten updated? Can you grab a copy of dmesg and xorg
logs? What version of mesa is being used?

I presume all your woes go away when booting with nouveau.noaccel=1.

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--- Comment #2 from Robert K. <robertk at mailsac.com> ---
Created attachment 138876
  --> https://bugs.freedesktop.org/attachment.cgi?id=138876&action=edit
matte.Xorg.0.log

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--- Comment #3 from Robert K. <robertk at mailsac.com> ---
Created attachment 138877
  --> https://bugs.freedesktop.org/attachment.cgi?id=138877&action=edit
matte.dmesg.log

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--- Comment #4 from Robert K. <robertk at mailsac.com> ---
Created attachment 138878
  --> https://bugs.freedesktop.org/attachment.cgi?id=138878&action=edit
glossy.Xorg.0.log

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--- Comment #5 from Robert K. <robertk at mailsac.com> ---
Created attachment 138879
  --> https://bugs.freedesktop.org/attachment.cgi?id=138879&action=edit
glossy.dmesg.log

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--- Comment #6 from Robert K. <robertk at mailsac.com> ---
Thank you very much.

I have finally managed how to deal with the scrambled display using the new
glossy screen. These are the requested logs:

1) Using the broken matte screen (Samsung LTN170U1-L01) (with this screen the
driver works as expected)

--- attachment matte.Xorg.0.log
--- attachment matte.dmesg.log

2) Using the new glossy screen (Samsung LTN170U1-L02) (with this screen the
driver does not work properly)

--- attachment glossy.Xorg.0.log
--- attachment glossy.dmesg.log
> I presume all your woes go away when booting with nouveau.noaccel=1.
As the listed OS are Live USB OS I don't actually know how to boot with this
setting.

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #7 from Martin Peres <martin.peres at free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/422.

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