Created attachment 90405 [details]
alock showing desktop when it should stay blank
Using the current (as of now) git drivers on a i5-4570, Gentoo ~amd64.
alock ( http://code.google.com/p/alock/ version 94 ) is a xscreensaver alternative, which locks and blanks (black) the screen. When you press enter, it shows a green border around the black screen. Then you enter your password (no other prompt shown) and the screen is unlocked. If you got the password wrong, the green border turns red and you have to wait a bit for the next attempt.
With current intel drivers in SNA/Tearfree mode, the behaviour is as follows:
1. You lock the screen using "alock -auth passwd -bg blank"
2. Screen goes black.
3. You press enter.
4. Screen shows a green border around an old still image of the desktop contents.
5. You enter your password.
6. Desktop is unlocked and old image is updated to current one.
What should happen is that the screen stays black (apart from the green border) in step 4. This works fine in UXA mode, and with non-intel driver, so I assume it's a driver specific issue.
Of course it could be a bug in alock that only appears in Intel/SNA mode for some reasons?!
Created attachment 90406 [details]
alock showing desktop when it should stay blank (mime fix)
Author: Chris Wilson <email@example.com>
Date: Mon Dec 9 10:49:56 2013 +0000
sna: Only discard READ hint for TearFree copy iff it subsumes the pixmap
Remembering that the target window may be smaller than its backing
Reported-by: Andreas Klauer <Andreas.Klauer@metamorpher.de>
Signed-off-by: Chris Wilson <firstname.lastname@example.org>