Description of problem: When xfce-power-manager blanks the display due to inactivity, the redisplay shows the screen shifted left by about an inch and a half. The left inch and a half of the screen is no longer visible. Version-Release number of selected component (if applicable): 1.6.1-20 How reproducible: Every time. Steps to Reproduce: 1. Boot to the login screen. 2. Wait until the display blanks (about ten minutes). 3. Hit a key to reactivate the display. Actual results: The screen is shifted. Expected results: The screen is identical to that before blanking. Additional info: If I log in before the screen blanks, the problem does not appear. Apparently, screen blanking after login is done by xscreensaver, not power-manager. I have proven, I think, that power-manager is the causing this bug by doing the following: 1. After login, invoke xfce4-power-manager-settings to change "Blank After" to 1 minute. 2. Wait until the screen blanks after 1 minute. 3. Hit a key to reactivate the display. 4. At this point, the screen is shifted. If I could identify where the default values come from, I could possibly work around this problem by changing them. The values set by xfce4-power-manager-settings affect only the user session, not the delay at the login screen. I have two computers running F29, but only one of them shows this behavior. The problem computer has an AMD Athlon 5000+ cpu with a NVIDIA GeForce GT 710 graphics card. The other has an Intel i7-6700 cpu with a NVIDIA GeForce GT 730 graphics card. Neither of these systems uses the proprietary NVIDIA drivers. No messages appear anywhere that appear to be related to this problem. I have examined messages from dmesg, journalctl, .xsession-errors, and /var/log/Xorg.0.log. I have stopped the power-manager daemon and generated debug information by running power manager with the --nodaemon option; no messages were generated during the screen blanking and recovery.
This bug appeared first in Fedora 28, and behaved there identically to my previous description. I never encountered the problem in previous versions, going all the way back to Fedora 9. I have recently verified that the bug is absent from Fedora 26 and 27.
This is a pretty odd one. :) What display manager are you using? lightdm? gdm? I can only think it's a weird video driver bug.
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This bug was also present in the initial release of Fedora 30. An update to Fedora 30 fixed the issue, but I don't know which change was responsible. I have now gone back to Fedora 29 to check this issue: the update (over 600 packages, including many affecting display) has eliminated this behavior. This bug can be closed.