Bug 4160 - gnome prevents session resize
Summary: gnome prevents session resize
Alias: None
Product: ThinLinc
Classification: Unclassified
Component: VNC (show other bugs)
Version: 3.3.0
Hardware: PC Linux
: P2 Normal
Target Milestone: 4.0.0
Assignee: Pierre Ossman
Keywords: hean01_tester
Depends on:
Blocks: 4144
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Reported: 2012-01-23 16:58 CET by Aaron Sowry
Modified: 2012-11-28 12:23 CET (History)
1 user (show)

See Also:
Acceptance Criteria:


Description Aaron Sowry cendio 2012-01-23 16:58:15 CET
Reconnecting to an existing session with a different resolution specified in the client settings does not resize the session (tested on Ubuntu 11.04 with Unity 2D).

This has been carried over from bug #4136.
Comment 1 Pierre Ossman cendio 2012-01-23 17:12:56 CET
Did some testing, and it is caused by Gnome. I can see the same thing on Fedora 16.

This is a variant of bug 3055. Once you've ever touched Gnome's display settings, it will try its damnedest to maintain that resolution, even in the face of external resizes like ours. So this is not a bug, it's a feature.

We'll have to consider if we want to try and defeat this behaviour, or just educate the users.
Comment 2 Pierre Ossman cendio 2012-07-17 13:44:04 CEST
I turned on some logging in gsd, and I got this:

Got RANDR event with timestamps change=1097476 = config=1097476
  Ignoring event since change >= config
Got RANDR event with timestamps change=1097476 < config=1162175
Applied stored configuration to deal with event

As you can see, the timestamp of the change newer updates. This could be why gnome is misbehaving. We might need to do something extra inside Xvnc to correctly update RandR.
Comment 3 Pierre Ossman cendio 2012-07-17 15:53:08 CEST
That was indeed the problem. Applying the patch for upstream bug 21987:


And fixing the VNC code to also update the timestamp, everything is now fine. Gnome no longer tries to fight us about the screen configuration.

Bug 3055 is still present though, but that one is probably the intended behaviour.
Comment 4 Pierre Ossman cendio 2012-07-17 16:18:26 CEST
Upstream patch in our build in r25503.
Comment 5 Pierre Ossman cendio 2012-07-17 16:22:47 CEST
VNC portion fixed in r25506.
Comment 6 Henrik Andersson cendio 2012-10-01 08:30:12 CEST
Tested against Ubuntu 12.04, logged on with a 1024x768 session,
changed the resolution to 800x600 using display preferences and
disconnected on next reconnected with 1024x768 resolution the
session was rescaled.

Same behavior with "Resize remote session to local window" both
unchecked and checked.

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