control: close -1 On Thu, 01 Feb 2018 11:40:35 +0100 Marius Mikucionis <mmikucio...@gmail.com> wrote: > Package: virtualbox > Version: 5.2.6-dfsg-2 > Severity: normal > Tags: patch > > Dear Maintainer, > > I am running Windows 10 guest and the screen flickers when something is > (re)drawn, > basically it's unusable. > > Relevant configuration to reproduce: > 1) nVidia drivers on the host. > 2) virtualbox guest additions with 3D acceleration enabled. > 3) enabled 3D accelaration in the Windows 10 machine settings. > > One workaround is to disable 3D acceleration, but here I found a better > solution: > > https://techblog.devlat.eu/2017/04/07/screen-flickering-in-virtualbox-with-3d-enabled/ > in particular it says: > > With nVidia drivers on the host, a race condition happens, causing buffers to > be swapped (i.e. picture to be shown) before rendering is completed by the > client, hence the flickering. > The only workaround is to change (comment out actually) a single line in > VirtualBox source and recompile it. After recompilation is done, it is > actually possible to just replace a single freshly compiled file, > VBoxOGLrenderspu.so, which is located in /usr/lib/virtualbox/. No need to > uninstall the “original” VirtualBox and install the self-compiled one. > > The patch is just one line: > https://www.virtualbox.org/attachment/ticket/13653/vbox-NVIDIA-fix-v2.patch.txt > --- > /home/alexey/vbox-orig/VirtualBox-5.0.0_BETA4/./src/VBox/HostServices/SharedOpenGL/render/renderspu_glx.c > 2015-05-18 18:02:05.000000000 +0300 > +++ ./src/VBox/HostServices/SharedOpenGL/render/renderspu_glx.c 2015-05-22 > 23:33:33.000000000 +0300 > @@ -1922,11 +1922,10 @@ > XSync(window->visual->dpy, 0); > } > } > } > > -#define CR_RENDER_FORCE_PRESENT_MAIN_THREAD > > void renderspu_SystemVBoxPresentComposition( WindowInfo *window, const > struct VBOXVR_SCR_COMPOSITOR_ENTRY *pChangedEntry ) > { > /* the CR_RENDER_FORCE_PRESENT_MAIN_THREAD is actually inherited from > cocoa backend impl, > * here it forces rendering in WinCmd thread rather than a Main thread. > > > Perhaps this patch can be included in Debian. >
Hello, thanks for the patch! There is a runtime variable that you can use to disable that thing, however I don't like to apply such patches, until upstream merges them. https://www.virtualbox.org/ticket/13653/ I pinged upstream, I'll include in case they ack it thanks G.
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