http://bugs.winehq.org/show_bug.cgi?id=6821
Summary: Graphical artifacts in HL2:EP1 Product: Wine Version: 0.9.26. Platform: PC OS/Version: Linux Status: UNCONFIRMED Severity: normal Priority: P2 Component: wine-directx AssignedTo: wine-bugs@winehq.org ReportedBy: akihana@gmail.com
Look over the EP1 screenshots for some good examples. Something is wrong that is at least partially related to monitors. Reflections appear in the sky where there should be none. Random geometric areas (various shaped elongated triangles, squares, etc) are blocked out when viewing many scenes from certain angles.
I've tried disabling monitors ingame, and this did help, but it isn't the only problem as the artifacts never completely disappear. Sometimes it is as simple as the health and power meters disappearing while other times almost the entire screen is totally covered in artifacts.