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Bug 669

Summary:	new screen locker with dual-head setup: secondary screen doesn't get hidden!
Product:	TDE	Reporter:	Sciurus vulgaris <rabid.zombie.squirrel>
Component:	system	Assignee:	Timothy Pearson <kb9vqf>
Status:	RESOLVED FIXED
Severity:	blocker	CC:	bugwatch, darrella, ignaz.forster, ilya.dogolazky, kb9vqf
Priority:	P1
Version:	3.5.13 [Trinity]
Hardware:	All
OS:	Linux
Compiler Version:		TDE Version String:
Application Version:		Application Name:
Attachments:	Fix multihead screen locking Fix multihead screen locking

Description Sciurus vulgaris 2011-11-21 12:07:22 CST

when using the new screen locker with a dual-head setup, the desktop on the secondary screen doesn't get hidden. i can see all running applications!

Comment 1 Ignaz Forster 2011-12-05 08:25:36 CST

In can confirm this issue - and I also think this is a critical bug. Note that this doesn't happen when using the preview. The error seems to be hardware independent, it happens with (at least) ATI und NVidia cards and open and closed source drivers.

Comment 2 Timothy Pearson 2011-12-05 12:51:29 CST

Nasty!

What side of the primary screen is your secondary screen on--the left or the right?

Comment 3 Ignaz Forster 2011-12-05 14:29:37 CST

For me the secondary screen is on the right (I think nobody ever tested it on the left here ;-)) and was configured using arandr / autorandr. I will try configuring it to be on the left side tomorrow...

Comment 4 Timothy Pearson 2011-12-05 14:30:55 CST

That is an interesting possible wrinkle.  Is anyone experiencing this problem NOT using xrandr to dynamically configure their displays?

Comment 5 Ignaz Forster 2011-12-06 09:23:53 CST

Putting the secondary screen to the left caused the screensaver to just appear on the left - in other word the screensaver seems to always appear on the leftmost screen...

Another interesting side effect: If the desktop is resized while it is locked then the content of the second screen also disappears, but you have to unlock the screen twice.

Comment 6 Timothy Pearson 2011-12-06 11:18:21 CST

There is code deep within kdesktoplock that interfaces with XRandR; this would explain the behaviour you are seeing.

I would gess that kdesktoplock is not reading the screen parameters correctly from XRandR at startup.  I will need to get a dual head test system set up and try to fix this security-related bug ASAP.

Tim

Comment 7 Timothy Pearson 2011-12-19 13:10:55 CST

Created attachment 232 [details]
Fix multihead screen locking

Comment 8 Timothy Pearson 2011-12-19 13:14:11 CST

The attached patch fixes the problem on my multihead test system.  Apply it to the kdebase/kdesktop/kdesktop_lock/ folder.

Comment 9 Timothy Pearson 2011-12-19 13:31:01 CST

*** Bug 753 has been marked as a duplicate of this bug. ***

Comment 10 Timothy Pearson 2011-12-21 20:55:38 CST

Created attachment 238 [details]
Fix multihead screen locking

Updated patch that also corrects an issue noted in Bug 753

Comment 11 Timothy Pearson 2011-12-21 20:56:19 CST

*** Bug 753 has been marked as a duplicate of this bug. ***

Comment 12 Timothy Pearson 2011-12-27 19:47:31 CST

Fixed in GIT hash 4ea3979.

Thanks for reporting!

Comment 13 ilya.dogolazky 2012-01-03 02:26:43 CST

(In reply to comment #3)

> (I think nobody ever tested it on the left here ;-))

I did ;)
The bug occurs on the both sides.