[Nouveau] [Bug 108615] New: [NVE7] changing resolution causes blank screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108615

            Bug ID: 108615
           Summary: [NVE7] changing resolution causes blank screen
           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: jbytecoder at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 142308
  --> https://bugs.freedesktop.org/attachment.cgi?id=142308&action=edit
Xorg server log just after resolution switch

Using latest software ( linux-4.19.0, xf86-video-nouveau-1.0.15, mesa-18.2.3,
libdrm-2.4.96, xorg-server-1.20.3 ). When I try to change screen resolution
using xrandr to anything below native resolution the screen goes blank. To be
exact 
issuing xrandr -s 1024x768 causes the flowing:
1) screen turns completely black right away
2) after some time  ( no more that 500ms ), the screen changes to black with
backlight on. Looks a lot like no modesetting console without any content 
3) this situation persists, indefinitely

What is interesting is that switching to console works. The console just works.
However when I switch back to X, the above procedure repeats with one detail -
for a brief moment ( at the same moment as step 1) ) the content of desktop in
selected resolution is visible. It seems that the desktop content is somewhere
in memory but the driver decides to render some other area of memory

The only resolution to this problem that is working is to use older kernel,
linux-4.9.95 to be precise  

I discovered the issue, playing games through wine. But to isolate the cause I
gathered dmesg & xorg.log, running only an openbox and using xrandr to cause
the issue

I don't know what further info could be usefull

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