id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 14349,Important Bug in Unscaled HiDPI Support on Windows8.1/10 Guest,DreamPiggy,,"VirtualBox Version: 5.0 r101573(official release version)[[BR]] Host Version: OS X 10.10.3 with MacBook 12`(Retina HiDPI 1280*800 default setting)[[BR]] Guest Version: Windows 8.1 / Windows 10 '''but not''' Windows 8[[BR]] [[BR]] '''What's wrong:'''[[BR]] After installed VirtualBox GuestAddition(with build-in version or 5.0.0 RC1,RC2,RC3 or whatever the latest 5.0.1 test version),the Unscaled HiDPI Support was broken.The entire monitor image distortion where the mouse pointer are.Look at the screenshot(which means what I see from screen). [[BR]] What I see:[[BR]] [[Image(http://img.hb.aicdn.com/732c6e18a2fd38e4f46b93fd678c9bb0dbfa64849196d-iV9kkv_fw658)]] [[BR]] But at the same time ,use the '''build-in''' screenshot(which means use the VBox toolbar option),everything '''looks''' OK. [[BR]] What VBox screenshot show:[[BR]] [[Image(http://img.hb.aicdn.com/72dbce851d5a0d23713712e204d933a1a420ed2910c78a-UnofOO_fw658)]] [[BR]] '''What I do:'''[[BR]] After installed the older GuestAddtion(VBoxGuestAdditions_5.0.0_BETA4,link here: [http://download.virtualbox.org/virtualbox/5.0.0_BETA4/VBoxGuestAdditions_5.0.0_BETA4.iso])[[BR]] it works OK! But this GuestAddition may cause WPF-Application crash(include VS2015 or some Metro Apps),and the latest version GuestAddtion(VBoxGuestAdditions_5.0.1-101689.iso) also have this bug.So there are no way to keep both useable and Retina support...Therefore I think maybe some commits after that '''BETA4''' reinsert this bug..... [[BR]] '''What I guess:'''[[BR]] Windows 8.1/10 use the new DPI-Aware API([https://msdn.microsoft.com/en-us/library/windows/desktop/dn469266%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396])[[BR]] which may behave differently from Windows 8.[[BR]] So this may be fixed by find the bug commit or add some special judgement code? I don't sure this may happen only in OS X Guest or All platforms.But i'm hopefully to fix this.. [[BR]] '''Attach are here.Include the VBox Guest and Host.'''",defect,new,guest additions,VirtualBox 5.0.0,,"Unscaled HiDPI,GuestAddition,Windows8.1/10",,Windows,Mac OS X