Bug 12297

Summary: [855GM] hang during VT switch
Product: xorg Reporter: CIJOML CIJOMLovic CIJOMLov <cijoml>
Component: Driver/intelAssignee: Jesse Barnes <jbarnes>
Status: RESOLVED FIXED QA Contact: Xorg Project Team <xorg-team>
Severity: critical    
Priority: medium CC: dmueller, foss-ml, mephinet, x
Version: git   
Hardware: Other   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Bug Depends on:    
Bug Blocks: 13027    
Attachments:
Description Flags
Fix / workaround which helped many Ubuntu users seeing this bug none

Description CIJOML CIJOMLovic CIJOMLov 2007-09-05 21:39:58 UTC 
Hi,

I use git 20070901 version and when CTRL+ALT+F1 switching to console or ALT+F& back to xorg, usually with this version I experience computer freeze. This can be tested very easy.

00:02.0 VGA compatible controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02)
00:02.1 Display controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02)

kernel vanilla 2.6.22.5, distro Debian testing

I have never seen this error with old version (i810)
Comment 1 CIJOML CIJOMLovic CIJOMLov 2007-09-17 15:47:10 UTC 
with git 20070917 it works better, but still experiencing this crash in second or third switch X,console,X, console and so on...
Comment 2 CIJOML CIJOMLovic CIJOMLov 2007-10-23 07:56:28 UTC 
Hi Eric,

any news about this problem?? It is really annoying! :(

Thanks a lot for reply
Comment 3 Eric Anholt 2007-10-23 10:12:10 UTC 
If I thought your bug was fixed, I would have closed it.  If you wonder if it's been fixed without someone noticing it to close it, keep testing master.
Comment 4 Jesse Barnes 2007-10-31 12:20:49 UTC 
There were some fixes for VT switch crashes for 8xx chips that went into master not long ago.  Can you test again and see if your problem still exists?
Comment 5 CIJOML CIJOMLovic CIJOMLov 2007-10-31 12:52:16 UTC 
Hi, 

My version is pretty new:

drwxr-sr-x  6 root    src           4096 2007-10-26 18:45 xf86-video-intel
Comment 6 CIJOML CIJOMLovic CIJOMLov 2007-10-31 12:54:18 UTC 
Hi,

my version is pretty new:

cijoml@notas:~/work/lingea$ ls -la /usr/src| grep xf86-video-intel
drwxr-sr-x  6 root    src           4096 2007-10-26 18:45 xf86-video-intel
Comment 7 Peter Clifton 2007-11-01 17:02:51 UTC 
Created attachment 12305 [details] [review]
Fix / workaround which helped many Ubuntu users seeing this bug

This might not be the "right" thing to do, but it seems that people hitting the bug on VT-switching were seeing the crash when programming the PIPE[AB]CONF registers. It looked like the registers might be keyed to some hardware state-machine dependant on the DPLL clock to sync, and locks the chip up if this isn't running. More specifically, it seems to lock it up if you try to enable the PIPE whilst the corresponding DPLL is in VGA mode.

Perhaps the tests might be special cased to only stop this reg programming on the 855 chips?
Comment 8 Jesse Barnes 2007-11-08 10:04:08 UTC 
I pushed Peter's fix upstream.  Please test and reopen if it doesn't work.

Thanks,
Jesse

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