Bug 10442

Summary:

Option "MergedFB" off leads to segfault

Product:

xorg

Reporter:

Vinícius Dias dos Santos <vininim>

Component:

Driver/Radeon

Assignee:

xf86-video-ati maintainers <xorg-driver-ati>

Status:

RESOLVED FIXED

QA Contact:

Xorg Project Team <xorg-team>

Severity:

major

Priority:

medium

CC:

alexdeucher, chithanh, sa

Version:

git

Hardware:

x86 (IA32)

OS:

Linux (All)

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
xorg.conf with mergedfb forced off	none
log with server backtrace	none
Stab in the dark	none

Description Vinícius Dias dos Santos 2007-03-28 08:27:54 UTC

server, drm, xf86-video-ati from git.
Current xf86-video-ati seems to be detecting a secondary monitor(inexistant
in my setup) and trying MergedFB by default. That leads to a lower resolution
mode than usual(and than specified in xorg.conf).
When issued the config setting Option "MergedFB" "off", server segfaults.

Comment 1 Vinícius Dias dos Santos 2007-03-28 08:28:49 UTC

Created attachment 9334 [details]
xorg.conf with mergedfb forced off

Comment 2 Vinícius Dias dos Santos 2007-03-28 08:30:01 UTC

Created attachment 9335 [details]
log with server backtrace

Comment 3 Alex Deucher 2007-03-28 08:40:56 UTC

hmmm... looks like mergedfb is not actually getting forced off.

Comment 4 Sven Arvidsson 2007-03-28 14:21:18 UTC

*** Bug 10405 has been marked as a duplicate of this bug. ***

Comment 5 Sven Arvidsson 2007-03-28 14:28:32 UTC

I'm having the same problem with MergedFB, and had it disabled for the same reason, the driver seems to detect a nonexistant second monitor and thus I get no Xv for video playback.

As a work around I set "MonitorLayout" "NONE, TDMS", but this only gave me a blank screen. My TFT monitor (connected to the VGA port) is detected as CRT. Should I file a separate bug about this?

I'm using a ATI Radeon 9100
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon R200 QM [Radeon 9100]

My backtrace of the crash, log file and configuration is available in the Debian bug I originally filed. Just ask and I will add any additional information needed. See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=413463

Comment 6 Michel Dänzer 2007-03-28 22:45:16 UTC

(In reply to comment #5)
> I'm having the same problem with MergedFB, and had it disabled for the same
> reason, the driver seems to detect a nonexistant second monitor and thus I get
> no Xv for video playback.

See bug 5623 which also explains how to work around the Xv problem.

> As a work around I set "MonitorLayout" "NONE, TDMS", but this only gave me a
> blank screen. My TFT monitor (connected to the VGA port) is detected as CRT.
> Should I file a separate bug about this?

There's no bug, the VGA port implies CRT from the driver POV.

Comment 7 Michel Dänzer 2007-03-28 23:04:27 UTC

Created attachment 9340 [details] [review]
Stab in the dark

Does this happen to help at all? Dave or Alex would probably have better ideas.

Alternatively, does Option "MonitorLayout" "CRT,NONE" avoid the problem?

Comment 8 Sven Arvidsson 2007-03-29 04:42:21 UTC

> There's no bug, the VGA port implies CRT from the driver POV.

I see, thanks for the explanation. This does not seem to be mentioned in the radeon man page.

> Created an attachment (id=9340) [details]
> Stab in the dark
> 
> Does this happen to help at all? Dave or Alex would probably have better ideas

That seems to work great, no crash anymore, wonderful! :)

> Alternatively, does Option "MonitorLayout" "CRT,NONE" avoid the problem?

Yes, setting both Option "MergedFB" "false" and Option "MonitorLayout" "CRT, NONE" does avoid the crash.

Comment 9 Alex Deucher 2007-03-29 05:13:45 UTC

(In reply to comment #7)
> Created an attachment (id=9340) [details]
> Stab in the dark
> 
> Does this happen to help at all? Dave or Alex would probably have better ideas.
> 
> Alternatively, does Option "MonitorLayout" "CRT,NONE" avoid the problem?
> 

Patch looks good to me.  I won't have time to test or debug this until this weekend.  If it works for Sven, I'd say commit it.

Comment 10 Michel Dänzer 2007-03-30 01:10:59 UTC

Fix pushed to git, thanks for testing.

Comment 11 Michel Dänzer 2007-04-02 05:35:12 UTC

*** Bug 10503 has been marked as a duplicate of this bug. ***

Comment 12 Vinícius Dias dos Santos 2007-04-05 16:16:17 UTC

The segfault is fixed with option mergedfb off, but now I get a blank("turned off") display with MergeFB Off or MonitorLayout CRT,NONE (or even NONE, CRT).
Leaving it closed since it's mainly about the segfault?

Comment 13 Michel Dänzer 2007-04-05 23:34:51 UTC

(In reply to comment #12)
> The segfault is fixed with option mergedfb off, but now I get a blank("turned
> off") display with MergeFB Off or MonitorLayout CRT,NONE (or even NONE, CRT).
> Leaving it closed since it's mainly about the segfault?

Right. Can you try current git without either option? It should no longer artificially limit the resolution. If you still have issues with that, please file a separate bug.

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