Bug 11230

Summary: screen looses color detail when switching to VT1 and back
Product: xorg Reporter: Rolf Leggewie <bugs.freedesktop.org>
Component: Driver/RadeonAssignee: xf86-video-ati maintainers <xorg-driver-ati>
Status: RESOLVED FIXED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium CC: bugztime.f.yukam
Version: 7.1 (2006.05)   
Hardware: x86 (IA32)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Bug Depends on: 13994    
Bug Blocks:    
Attachments:
Description Flags
xorg.conf
none
Xorg.0.log
none
Xorg.0.log after switching to VT1 and back
none
Xorg.0.log after switching to VT1 and back with MergedFB instead of Xinerama none

Description Rolf Leggewie 2007-06-11 05:15:08 UTC 
My discussion about this with Alex Deucher can be found at http://thread.gmane.org/gmane.linux.hardware.thinkpad/31161

I have an X24 set up to use Xinerama (until now, I will change this to MergedFB) with the internal display at 1024x768 and an external display at 1680x1050.  When I go to VT 1 and then back to X the laptops internal display seems to be dropping to 8-bit color or something like that.  At any rate it looses a lot of color detail.  The external display remains fine.

Alex had the following to say about this.

> > I'm not sure I've seen that before. Is it temporary during the switch
> > or permanent after you've switched back?
>
> It is permanent.  The external screen keeps the higher color setting
> where the internal screen looses some color detail.  Maybe it is not
> really that the X server is dropping to 8-bit after all but it sure
> looks like it is missing a lot of color detail.

I suspect one the CLUT is not being restore properly for crtc1 so the
palette is wrong.  Can you file a bug at https://bugs.freedesktop.org?
Comment 1 Rolf Leggewie 2007-06-11 05:19:31 UTC 
Created attachment 10251 [details]
xorg.conf

I attach my xorg.conf if you promise not to laugh about it ;-)  Much of this is a real mistery to me.  I am running 7.1.1ubuntu6.2 on edgy.
Comment 2 Alex Deucher 2007-06-11 06:25:50 UTC 
Does this bug only affect xinerama or also mergedfb?  Also, can you attach your log(s)?
Comment 3 Rolf Leggewie 2007-06-11 12:10:01 UTC 
Created attachment 10254 [details]
Xorg.0.log

(In reply to comment #2)
> Does this bug only affect xinerama or also mergedfb?  Also, can you attach your
> log(s)?

Fortunately, this does not occur with mergedfb.  

My feeling is that the external TFT screen has a few artifacts (like ghosts/shadows) when run with mergedfb as compared to xinerama.  But I think this is just me having set some config option incorrectly.
Comment 4 Rolf Leggewie 2007-06-11 12:13:57 UTC 
Created attachment 10255 [details]
Xorg.0.log after switching to VT1 and back
Comment 5 Rolf Leggewie 2007-06-11 12:19:30 UTC 
Created attachment 10256 [details]
Xorg.0.log after switching to VT1 and back with MergedFB instead of Xinerama
Comment 6 Alex Deucher 2007-06-11 13:56:07 UTC 
> Fortunately, this does not occur with mergedfb.  

Try xinerama mode with the mergedfb options commented out.

> 
> My feeling is that the external TFT screen has a few artifacts (like
> ghosts/shadows) when run with mergedfb as compared to xinerama.  But I think
> this is just me having set some config option incorrectly.
> 

I theory, the hardware should be programmed the same in both cases.  Any chance you can get some comparative pictures?
Comment 7 Alex Deucher 2007-08-31 09:00:02 UTC 
do you still have this problem with the latest code from ati git or release 6.7.192?
Comment 8 Rolf Leggewie 2007-09-04 01:21:36 UTC 
not sure where to get that for edgy
Comment 9 Benjamin Close 2008-01-11 02:39:11 UTC 
Bugzilla Upgrade Mass Bug Change

NEEDSINFO state was removed in Bugzilla 3.x, reopening any bugs previously listed as NEEDSINFO.

  - benjsc
    fd.o Wrangler
Comment 10 Alex Deucher 2008-01-11 12:03:22 UTC 
Does this problem persist on newer versions of the radeon driver?
Comment 11 Rolf Leggewie 2008-01-13 08:55:05 UTC 
(In reply to comment #10)
> Does this problem persist on newer versions of the radeon driver?

Unfortunately, I have even more serious trouble now -> bug 14058, so that I cannot even switch to the console and back without completely crashing the machine.
Comment 12 Rolf Leggewie 2008-02-01 00:00:34 UTC 
(In reply to comment #7)
> do you still have this problem with the latest code from ati git or release
> 6.7.192?

I am just now recompiling 6.7.197 from hardy for gutsy now.I'll let you know about the results.

https://bugs.launchpad.net/~r0lf/+archive
Comment 13 Rolf Leggewie 2008-02-01 00:03:43 UTC 
(In reply to comment #11)
> Unfortunately, I have even more serious trouble now -> bug 14058

I worked around this regression problem by downgrading to the latest feisty version 1:6.6.3-2ubuntu6.  I'll see about the regression problem and this problem in the recompiled hardy version.
Comment 14 Rolf Leggewie 2008-08-08 18:18:19 UTC 
now that bug 13994 is fixed, I am happy to report that I don't experience this problem any longer.

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