Hello again, I think I finally found something that could be a good beginning. I ran GTA on two boxes with WINEDEBUG=+relay,+ddraw,+xrandr,+x11settings and compared the two output. On the laptop (where it works), there are three sets of calls to EnumDisplayMode, browsing three times all modes. On the desktop (where it doesn't work), there is a full set of calls to EnumDisplayMode, followed by the beginning of a second one that doesn't reach end. It is interrupted with the following message: trace:ddraw:IDirectDrawImpl_EnumDisplayModes Application asked to terminate the enumeration Do you have any idea why this call could end like this ? Are there too many graphic modes on the desktop computer ? How could I reduce the set ? Is this the supposed behavior that it stops like this ? Regards, Colin