Bug 329051 - Crash in attempted multihead configuration
Crash in attempted multihead configuration
Product: Fedora
Classification: Fedora
Component: xorg-x11-server (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Dave Airlie
Fedora Extras Quality Assurance
Depends On:
  Show dependency treegraph
Reported: 2007-10-12 02:02 EDT by Andrew Bartlett
Modified: 2018-04-11 11:00 EDT (History)
2 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2008-05-09 01:12:41 EDT
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Regression: ---
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Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Working xorg log, from no config (others to follow) (207.70 KB, text/plain)
2007-10-12 02:02 EDT, Andrew Bartlett
no flags Details
Config that causes the crash (965 bytes, text/plain)
2007-10-12 02:03 EDT, Andrew Bartlett
no flags Details
Xorg config showing Sig11 (35.42 KB, text/plain)
2007-10-12 02:23 EDT, Andrew Bartlett
no flags Details
Debug session on another computer showing the same issue (2.92 KB, text/plain)
2008-01-08 01:07 EST, Andrew Bartlett
no flags Details

  None (edit)
Description Andrew Bartlett 2007-10-12 02:02:56 EDT
Description of problem:
Attempting to setup dual head configuration, with DVI and VGA outputs pointing
at 2 LCD screens fails. 

Version-Release number of selected component (if applicable):

How reproducible:
Every time

Steps to Reproduce:
1. Using supplied xorg.conf
2. Start X
3. boom
Actual results:
Sig11 in X server
cannot restore display (perhaps a kernel issue)

Expected results:
dual head-lovelyness.   Actually seen working with xrandr at runtime

Additional info:
System works (single head) without a config file.  Runs in clone mode if VGA
connector sill connected to other LCD.
Comment 1 Andrew Bartlett 2007-10-12 02:02:57 EDT
Created attachment 225051 [details]
Working xorg log, from no config (others to follow)
Comment 2 Andrew Bartlett 2007-10-12 02:03:58 EDT
Created attachment 225061 [details]
Config that causes the crash
Comment 3 Andrew Bartlett 2007-10-12 02:23:10 EDT
Created attachment 225071 [details]
Xorg config showing Sig11
Comment 4 Andrew Bartlett 2007-10-12 02:24:34 EDT
Any suggestions as to debuginfo packages to install and advise on how best to
attach gdb for a more useful backtrace gratefully accepted.
Comment 5 Matěj Cepl 2007-10-12 10:44:24 EDT
I think we have what we need in the attachment 225071 [details], and I will now pass it to
the developers. If you want to digg deeper, there is of course
Comment 6 Andrew Bartlett 2008-01-08 01:07:59 EST
Created attachment 291037 [details]
Debug session on another computer showing the same issue

Another of my computers (ati chipset) shows the same issue, and gdb shows up
the NULL pointer de-reference easily.
Comment 7 Andrew Bartlett 2008-01-08 01:10:25 EST
This appears to be in the common code, rather than the i810 driver. 
Comment 8 Andrew Bartlett 2008-01-08 01:14:41 EST
sorry for the stream of updates...

This occurs on current rawhide, with
Comment 9 Andrew Bartlett 2008-01-09 16:35:10 EST
When avoiding the old multi-head code, and using new randr only, it now works on
both F8 (i810) and rawhide (radeon). 

However, the path to this segfault should be eliminated...

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