Sounds really interesting. Any chance of this being the same as https://bugzilla.gnome.org/show_bug.cgi?id=730763 ?
Could also indeed be an issue related to Cinnamon. Can you try to reproduce under a different WM? Can you download vte-0.38.3, compile with "./configure --enable-debug; make" and launch with "./src/vte-2.91", does it also misbehave? If so, start with "VTE_DEBUG=all ./src/vte-2.91", do you see the entire window flashing up in red for each Shift+PageXx keypress, and is the result still buggy? Is there output produced between the Shift+PageXx keypresses, or is it irrelevant? ** Bug watch added: GNOME Bug Tracker #730763 https://bugzilla.gnome.org/show_bug.cgi?id=730763 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-terminal in Ubuntu. https://bugs.launchpad.net/bugs/1460062 Title: Scrollback with Shift-PageUp Shift-PageDown does not refresh screen Status in gnome-terminal package in Ubuntu: New Bug description: I am often using Scrollback in GNOME-Terminal. The current version forgets to refresh the screen timely afterwards. For one thing, it means that one is wildly pressing Shift-PageUp Shift-PageDown too often and it is hard to find things. For another, when trying to highlight material with the mouse, the refresh happens after the highlighting completes so the highlighted material is on a different page than the material you _imagined_ to be highlighting. Very annoying. Basically, you have to remember to do an extra click or keypress or whatever in order to trigger the screen refresh before you can do anything serious. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: gnome-terminal 3.14.2-0ubuntu3 ProcVersionSignature: Ubuntu 3.16.0-34.47-generic 3.16.7-ckt8 Uname: Linux 3.16.0-34-generic i686 NonfreeKernelModules: nvidia ApportVersion: 2.17.2-0ubuntu1.1 Architecture: i386 CurrentDesktop: X-Cinnamon Date: Fri May 29 14:56:07 2015 InstallationDate: Installed on 2011-10-14 (1322 days ago) InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111011) SourcePackage: gnome-terminal UpgradeStatus: Upgraded to vivid on 2015-04-27 (32 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-terminal/+bug/1460062/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

