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Bug#567747: xserver-xorg-video-intel: Reviewing Xorg.0.log appears X system didn't detect a Screen

Thanks for your suggestions, first I try using Option "Enable" "true" on KMS enable but doesn't work X still hang, also I try xrandr and show no screens. After Googling found some pieces of information, first in bug #555906 Julien Cristau sugest a way to enable KMS by default (so previous versions of intel was working on UMS?) in recent version of package (2:2.9.1-1+exp1-> 2:2.9.1-2). So my assumption is when upgrade to 2:2.9.1-2 my system stop working because use of KMS, right?

I found in bug #567712 information to disable KMS:

"A Disabling KMS fixes this problem (might be related to [1]), just comment out
the line in /etc/modprobe.d/i915-kms.conf
options i915 modeset=0"
 
So I disable KMS on my system and Now it works! and xrandr detects fine all my screens

antares:~# xrandr -q
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 2048 x 2048
VGA disconnected (normal left inverted right x axis y axis)
LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis) 303mm x 190mm
   1280x800       60.0*+
   1024x768       85.0     75.0     70.1     60.0 
   832x624        74.6 
   800x600        85.1     72.2     75.0     60.3     56.2 
   640x480        85.0     72.8     75.0     59.9 
   720x400        85.0 
   640x400        85.1 
   640x350        85.1 
TV disconnected (normal left inverted right x axis y axis)

I have some questions

Is this a regression of bug #555906? or just and immature release of xserver-xorg-video intel as says on a Ubuntu bug report (https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/429369)?

Note that this is a workaround and not a fix, and that the UMS option is likely to be removed in the future (hopefully only when bugs like this have been fixed). It would be nice if you could add the ModeDebug option described above and attach the resulting Xorg.0.log here, since that will tell us how the monitor detection works with UMS. The problem seems to be that with KMS the driver thinks that no monitors are attached. It would be nice if you could also attach the output of dmesg for when you boot with KMS (i.e. without the i915.modeset=0 option).

I have another Laptop HP with Intel 82852/855GM with same problem, but this workaround (disable KMS on /etc/modprobe.d/i915-kms.conf) doesn't work, what can you suggest?

Thanks for your effort and comments

JRChan

On 02/02/2010 12:40 AM, Brice Goglin wrote: 
Juan Ramon Chan wrote:
  
Package: xserver-xorg-video-intel
Version: 2:2.9.1-2
Severity: normal

In Xorg.0.log appears an error when trying to detect Screen but none has found
"(EE) Screen(s) found, but none have a usable configuration."

Why this could happend?, is there a way to specify manual as workaround in xorg.conf while new version of xserver-xorg-video-intel appears?
  
    
The driver doesn't seem to detect your internal panel (LVDS), it's
surprising that upgrading Xserver and keeping intel driver 2.9.1 broke
this. You should try with kernel modesetting enabled if not already done.

Then you could try forcing the enabling of LVDS (or LVDS1 if KMS is
enabled) by using
  Option "Enable" "true"
and then add custom modelines if needed, see
http://wiki.debian.org/XStrikeForce/HowToRandR12

Brice
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