[NVE7] changing resolution causes blank screen

Submitted by jbytecoder@gmail.com

Assigned to Nouveau Project

Description

Created attachment 142308
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:

screen turns completely black right away
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
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

**Attachment 142308**, "Xorg server log just after resolution switch":
Xorg.0.log