I filed a bug for this but there is no answer, not even a few questions to provide extra details.
Description of problem:
I have set a screen resolution of 1280x1024 (5x4) on my Samsung SyncMaster 750s (circa year 2000). Fedora 17 x86_64 Gnome 3.4. When the screen saver and screen lock engage, after I enter my password to unlock the screen the 1280x1024 (5x4) resolution is no longer available and the screen defaults to 1024x768 (4x3). Should the machine reboot, the first login will come up again with the desired 1280x1024 (5x4) resolution.
Previously, this was (curiously) "corrected" by (each time after unlocking the screen) going into the Applications / System Tools / System Settings / Displays in order to manually correct the problem; however, besides this being undesirable, the system would automatically correct the screen resolution before I could click the "apply" button.
Version-Release number of selected component (if applicable):
Steps to Reproduce: 1. boot machine -- correct screen resolution is applied 2. allow screensaver to engage 3. enter password to unlock screen
higher resolutions are not available and screen defaults to 1024 x 768
1280x1024 (5x4) resolution would remain.
Followup comments from me:
firstname.lastname@example.org 2012-06-12 20:16:45 EDT
Inexplicably and despite the lack of any updates, I now can't reproduce this bug since the "expected result" of keeping the 5:4 resolution is occuring.
[reply] [-] Comment 2 email@example.com 2012-06-13 07:40:12 EDT
... and now overnight it has reproduced itself.
[reply] [-] Comment 3 firstname.lastname@example.org 2012-06-18 07:13:47 EDT
just upgraded to kernel 3.4.2-4.fc17.x86_64 and rebooted
As described, the desired screen size of 5:4 has returned on its own. I have tried to do a screen lock via the menu in the upper right hand corner, and this does not cause the system to "forget" the screen resolution settings, as mentionned above. I will see if allowing the system to do its own automatic screen lock will reproduce it again, which I expect will be the case.
email@example.com 2012-06-18 11:48:43 EDT
just did as previously stated (about 4.5 hours screen lock after screen saver / screen lock timed out on its own) and screen came back with desired screen resolution.
Will follow through again this evening when I get home again.
... and I spoke too soon. Out of curiosity, I went into Activities / Applications / System Tools / System Settings / Displays and whaddya know, the system decides "whoops, for whatever reason the hightest resolution available is 4:3 1024 x 768" and the screen automatically kicked down the resolution to 4:3 1024 x 768.