There are a few new drivers in Service Pack 1, all of them related to RemoteFX – UMRDP Display Driver (rdpudd.dll), Microsoft RDP Video Miniport Driver (rdpvideominiport.sys), Microsoft Virtual 3D Video Transport Driver (Synth3dVsc.sys), Virtual GPU Miniport Driver (rdvgkmd.sys), Remote Desktop USB Hub (tsusbhub.sys) and Remote Desktop USB Hub Filter Driver (tsusbflt.sys).
The last two drivers are related to RemoteFX USB redirection234, which provides a generic USB Request Block (URB) forwarding mechanism over the network5 . The VGPU WDDM driver enables the hosted VMs to share the Hyper-V host GPU(s) by virtualizing them.
No new system services have been added in this service pack. This means developers are less likely to be making arrangements to call a new system service and/or change the way they call an existing service.
agp440.sys, the Intel AGP Bus Filter Driver, is not a boot start driver any more. This means if you were used to agp440.sys being the last driver during boot with sos1 before display switches to boot kernel version screen, you need to watch for the formerly penultimate driver classpnp.sys instead.7
FsDepends.sys, the File System Dependency Manager Mini Filter Driver has changed its altitude from 370060 (FsFilter Activity Monitor) to 407000 (FsFilter Top). I would guess this may be in response an interop issue with some other filter above 370060 or someone just “fixed” the altitude. If you have a mini filter in either of those ranges and see your relative position change with respect to FsDepends, ie. you used to be above and now you are below or vice versa, you should retest and make sure everything is working as designed after installing SP1.
1sos is set on by bcdedit /set sos on or by /sos in boot.ini. When booting in safe mode, sos is on.
5thus requiring device drivers to be installed on the server rather than the client
6only if you turn on remote desktop after upgrading to SP1
7this may also mean that it is time for everyone emotionally attached to AGP to detach and distance themselves lest they will be hurt
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