With gnome-display-properties, projectors' maximum resolution is incorrectly detected as 1360x768 instead of 1024x768. Since university/conference projectors are pretty much all XGA projectors, it doesn't seem to make sense that they would support resolutions higher than 1024x768.
- I've had this problem for years with every projector I've encountered in universities/conferences
- This is over a VGA connection
- I had this problem on Intel i915 GPUs and I'm seeing this now on my T43p sporting a M24GL [Mobility FireGL V3200] running the open source radeon driver
- This problem doesn't occur with LCD monitors (or TVs) over VGA
I was wondering initially if this might be related to the VGA cable (those projectors must have pretty long extension cables, maybe it messes up autodetection). In any case, the user/presenter can't change the wiring of the building, and I wonder where it actually picks that 1360x768 from, anyway.
I've tried to find similar bug reports but they're either very old or with different symptoms, so sorry if it has already been reported.
Please attach your xorg log. I'm pretty sure this is an xserver issue. The projectors most likely do not provide an edid so the default modes are added and the xserver picks 1360x768. This patch may fix the issue:
Created attachment 42231 [details]
on Mar 25, 2017 at 23:35:39.
(provided by the Example extension).