Nouveau - Feb 2016 - [Bug 94342] New: Nvidia G96GLM 3840x2160@30 not functional with nouveau

https://bugs.freedesktop.org/show_bug.cgi?id=94342

            Bug ID: 94342
           Summary: Nvidia G96GLM 3840x2160 at 30 not functional with nouveau
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: estellnb at elstel.org
        QA Contact: xorg-team at lists.x.org

While my Nvidia G96GLM [Quadro FX 770M] yields 3840x2160 at 30 well under
Windows
7 certain problems appear when trying to make use of that mode under
nouveau/Linux. The 3840x2160_23.00 mode described in Bug 93405 works well also
with the G96GLM; here even without any nouveau.hdmimhz parameter.
  A 3840x2160 at 30 mode appears automatically as soon as I specify
nouveau.hdmimhz=297. However when I select it the external monitor turns white
with a black bar at the bottom instead of showing the correct screen content.
Trying predefined modelines by cvt, gtf or the arachnoid modeline calculator
(online) does not yield any usable result either (blackscreens).
  Unfortunately many 4K screens only support at minimum 30Hz and not 23Hz so
that this issue is a real problem. Besides this heavy mode switching can still
lead to crashes/hangs while the 3840x2160 at 30-interlaced mode worked well even
without a hdmimhz parameter. However for interlaced modes the mouse pointer
still disappears.

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--- Comment #1 from Elmar Stellnberger <estellnb at elstel.org> ---
Created attachment 122044
  --> https://bugs.freedesktop.org/attachment.cgi?id=122044&action=edit
Xorg.0.log

Linux AmiloXi3650 4.5.0-rc4-ARCH #4 SMP PREEMPT Sat Feb 20 22:27:16 CET 2016
x86_64 GNU/Linux
X.Org X Server 1.18.1
Release Date: 2016-02-08

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--- Comment #2 from Elmar Stellnberger <estellnb at elstel.org> ---
Created attachment 122045
  --> https://bugs.freedesktop.org/attachment.cgi?id=122045&action=edit
journal

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--- Comment #3 from Elmar Stellnberger <estellnb at elstel.org> ---
Created attachment 122046
  --> https://bugs.freedesktop.org/attachment.cgi?id=122046&action=edit
3840x2160 at 30 - snapshot of the monitor

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--- Comment #4 from Elmar Stellnberger <estellnb at elstel.org> ---
4.6.0-rc2-ARCH-00004-g603539d: As soon as I boot with a hdmimhz=297 I get a
blackscreen though the graphics card is known to work with 3840x2160 at 30 under
Windows; i.e. that should work.

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--- Comment #5 from Elmar Stellnberger <estellnb at elstel.org> ---
same problem with 4.6.0-rc5-ARCH-00005-g0b20a43.

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--- Comment #6 from Elmar Stellnberger <estellnb at elstel.org> ---
Created attachment 123450
  --> https://bugs.freedesktop.org/attachment.cgi?id=123450&action=edit
mmiotrace of setting 3840x2160 at 30 with the proprietary driver

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--- Comment #7 from Elmar Stellnberger <estellnb at elstel.org> ---
Created attachment 123451
  --> https://bugs.freedesktop.org/attachment.cgi?id=123451&action=edit
another mmiotrace of setting 3840x2160 at 30 with the proprietary driver

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--- Comment #8 from Elmar Stellnberger <estellnb at elstel.org> ---
same with 4.6.0-ARCH-00466-ge80ac9b.

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https://bugs.freedesktop.org/show_bug.cgi?id=94342

Elmar Stellnberger <estellnb at elstel.org> changed:

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

--- Comment #9 from Elmar Stellnberger <estellnb at elstel.org> ---
  As it turned out a refresh rate of 30Hz can be achieved with the OSS-driver
and the right modeline:

  Modeline "3840x2160_30.00"  268.06  3840 3992 4080 4112  2160 2161
2164 2173
+hsync -vsync

  It is a trick to set nouveau.hdmimhz=296 instead of 297 in order to prevent
the automatic mode requiring a higher TMDS frequency to appear automatically
which blackens the screen. Once a mode with too high frequency has been set the
external monitor will stay without signal until I reboot. In a practice the
TMDS limit may neither be 225 nor 297 but somewhere in between.

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