Comment 17 for bug 206998

The program without the patches is the old xrandr 1.0 Screen Resolution tool, which lacks support for multi-monitor resolution setting, and does not use the same mechanisms for altering the screen resolution.

The patch 101 is the one from Fedora that adds this new feature. Patches >101 are Ubuntu patches to customize and improve the implementation for us (and that I plan to forward upstream shortly). Patch 102 enables 101 to build and be installed, so dropping it simply reverts us back to the old dialog that we're trying to replace.

It is possible that the bug lays in the randrwrap.c file added in patch 101, however I suspect it may be something in either the window manager or in the -intel driver that this GUI tool simply triggers.

It is interesting that you did not see it with xrandr; I would have expected there to be some method to reproduce it using xrandr.

Perhaps the next step would be to isolate the code from randrwrap.c that causes this issue into a test case, and submit to Xorg.