Bug 5280

Summary: Display sometimes locked up on resume on i810 w/DRI enabled
Product: DRI Reporter: Lorenzo Colitti <lorenzo>
Component: DRM/otherAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED WORKSFORME QA Contact:
Severity: critical    
Priority: high CC: alanh
Version: XOrg git   
Hardware: x86 (IA32)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
My xorg.conf
none
Log file of crash none

Description Lorenzo Colitti 2005-12-08 12:56:37 UTC 
When DRI is enabled, about 1 time out of 10 my laptop's display dies when coming
out of S3 (suspend-to-RAM). The symptoms are:

- Instead of the normal X display coming back, only the mouse pointer appears
- X dies, reporting "Fatal server error: lockup"
- The display is totally unusable. Console doesn't work, X doesn't work,
"vbetool post" doesn't work, the only thing left is a reboot

This is using X.org 6.9RC3 on an IBM thinkpad X40 with an i855 integrated
graphics card, but it also happened on a Dell latitude D400 with an i855.

lspci reports:

0000:00:02.0 VGA compatible controller: Intel Corporation 82852/855GM Integrated
Graphics Device (rev 02)
Comment 1 Lorenzo Colitti 2005-12-08 12:57:17 UTC 
Created attachment 4040 [details]
My xorg.conf
Comment 2 Lorenzo Colitti 2005-12-08 12:58:00 UTC 
Created attachment 4041 [details]
Log file of crash
Comment 3 Lorenzo Colitti 2005-12-08 12:59:50 UTC 
For what it's worth, my suspend-to-ram script does:

chvt 1
vbetool vbestate save > /tmp/vbe
echo mem > /sys/power/state
vbetool vbestate restore < /tmp/vbe
chvt 7
Comment 4 Lorenzo Colitti 2005-12-08 13:01:32 UTC 
Note that if DRI is disabled with:

    Option "DRI" "off"

this does not occur and resume works fine 100% of the time.
Comment 5 Lorenzo Colitti 2005-12-15 12:06:51 UTC 
CC'ing alan as suggested by Dave Airlie
Comment 6 Lorenzo Colitti 2005-12-15 13:15:36 UTC 
More info:

- When the lockups happen on resume, |outring| is not aligned on a QWord
  boundary. This is strange because outring is only ever incremented by 4
  in the code. Perhaps it's not initialized during resume?

- Perhaps what happens is that if we suspend when the ring buffer is full,
  it stays full on resume and "gets stuck"?
Comment 7 Alan Hourihane 2006-01-30 20:19:08 UTC 
You might want to try the latest CVS of X.Org, and get the latest DRM too.
Comment 8 Alan Hourihane 2006-02-18 06:59:01 UTC 
Try without vbetool. Users have reported to me that when they've disabled it, it
works fine.
Comment 9 Alan Hourihane 2006-06-22 01:15:25 UTC 
Did removing vbetool fix it ?
Comment 10 Lorenzo Colitti 2006-06-22 03:27:21 UTC 
It seems to work most of the time now. Sometimes it gets stuck, but only rarely.
Resolving as WORKSFORME.

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