Nouveau - May 2016 - [Bug 95334] New: GM107 with 2560x1440 display on HDMI selects suboptimal resolution 1920x1080

https://bugs.freedesktop.org/show_bug.cgi?id=95334

            Bug ID: 95334
           Summary: GM107 with 2560x1440 display on HDMI selects
                    suboptimal resolution 1920x1080
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: bugs.freedesktop.org at hpoley.dds.nl
        QA Contact: xorg-team at lists.x.org

Display is a Crossover 2720MDP (cheap South Korean QHD screen). I don't
think
this ever worked right with nouveau since when I bought it in March 2013. The
correct full resolution is not available in Ubuntu's System Settings section
'Displays'. It works fine with the nvidia driver (and under Windows). 

$ lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation GM107 [GeForce GTX 750
Ti] (rev a2)

Will attach logs later on.

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--- Comment #1 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl> ---
Created attachment 123594
  --> https://bugs.freedesktop.org/attachment.cgi?id=123594&action=edit
Crossover 2720MPD EDID dump

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--- Comment #2 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl> ---
Created attachment 123595
  --> https://bugs.freedesktop.org/attachment.cgi?id=123595&action=edit
Log from EDID dumper get-edid

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--- Comment #3 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl> ---
Created attachment 123596
  --> https://bugs.freedesktop.org/attachment.cgi?id=123596&action=edit
Kernel log buffer from `dmesg`

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--- Comment #4 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl> ---
Created attachment 123597
  --> https://bugs.freedesktop.org/attachment.cgi?id=123597&action=edit
stdout from parse-edid

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--- Comment #5 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl> ---
Created attachment 123598
  --> https://bugs.freedesktop.org/attachment.cgi?id=123598&action=edit
Errors from parse-edid

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--- Comment #6 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl> ---
Created attachment 123599
  --> https://bugs.freedesktop.org/attachment.cgi?id=123599&action=edit
stdout from edid-decode

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--- Comment #7 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl> ---
Created attachment 123600
  --> https://bugs.freedesktop.org/attachment.cgi?id=123600&action=edit
Xorg.0.log from system running nouveau

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--- Comment #8 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl> ---
Not too relevant, since it's not in the EDID, but the name of the screen is
Crossover 2720MDP as originally mentioned (made a typo in the upload
description).

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--- Comment #9 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl> ---
Graphics card is the Palit GeForce GTX 750 Ti KalmX (a fanless card). Using the
Mini-HDMI port, and an HDMI connector on the screen side.

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--- Comment #10 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl>
---
Created attachment 123602
  --> https://bugs.freedesktop.org/attachment.cgi?id=123602&action=edit
`ddcprobe` output

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--- Comment #11 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl>
---
Created attachment 123603
  --> https://bugs.freedesktop.org/attachment.cgi?id=123603&action=edit
`xrandr --props` output

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https://bugs.freedesktop.org/show_bug.cgi?id=95334

--- Comment #12 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
Hi,

This is likely caused by the hdmi clock restrictions in the nouveau kernel
driver, which are fixed by this commit:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1a0c96c075bb4517d4ce4fb6750ee0a3cf38714c

Which is available in the 4.5 (and later) kernels, can you please upgrade your
kernel to 4.5 and try again?

Regards,

Hans

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--- Comment #13 from Henk Poley <bugs.freedesktop.org at hpoley.dds.nl>
---
Nice if your bugs are fixed in advance ;)

Performance is more sluggish than the proprietary driver. But it picks the
native resolution using Linux v4.5.1. Much better.

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Henk Poley <bugs.freedesktop.org at hpoley.dds.nl> changed:

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

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