[Bug 52026] New: Poor performance with X86_SYSFB + DRM_SIMPLEDRM set in the kernel

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52026

Bug ID: 52026
           Summary: Poor performance with X86_SYSFB + DRM_SIMPLEDRM set in
                    the kernel
           Product: Wine
           Version: 6.21
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

I was having bad performance issues.  It was reproducible even in the "winecfg"
GUI with no game running.  Wine took much longer to start up than normal and it
made my whole system lag/stutter while it was running.

I finally figured out the problem was with some kernel options that I had set. 
I was using the new SimpleDRM in the Linux kernel 5.14.  I turned off
CONFIG_X86_SYSFB, recompiled the kernel, and the problem went away.

Interesting, I had not had this problem using Lutris although it's using older
5.x versions of Wine for the games I play but the problem did appear in
wine-staging 6.21 so this is a possible regression.

I also had no problems running any native games.  The setting appears to only
cause problems with Wine in specific.

System Info:
Distro: Arch Linux
Kernel: 5.14.17
GPU: Nvidia Geforce 770 GTX
Driver: Proprietary Nvidia driver 470.82