[Bug 33617] Re: [agp] X.org does not initialize screen on IBM T20, T21, T22
Bryce Harrington
bryce at bryceharrington.org
Sat Mar 22 00:20:06 UTC 2008
** Description changed:
On the IBM T20 laptop using the Savage drivers, when gdm starts X, the
screen stays black with a "_". The sound is initialized (I can hear the
startup sound) and I can login through SSH. The screen gets initalized
every 3 to 4 times of startup but I can't decern a pattern. This has
always worked in previous versions of Ubuntu.
Workaround: Add this to the Device section of xorg.conf:
Option "BusType" "PCI"
+
+ According to
+ http://www.thinkwiki.org/wiki/Problem_with_video_related_system_lockup:
+
+ The problem of lockups or video corruption as a result of 3D rendering
+ is [not] well-known/understood. There appears to be a bug in AGP on
+ Thinkpads interacting with Savage graphics cards. For reference, there
+ was a recent discussion of this problem on the Linux-Thinkpad Mailing
+ List. If you are experiencing lockups related to 3D rendering (using
+ DRI) and you are using an XOrg version more recent than 6.9/7.0, you may
+ need to add one or both of the following lines to the Devices section of
+ your xorg.conf file:
+
+ Option "BusType" "PCI"
+ Option "DmaMode" "None"
--
[agp] X.org does not initialize screen on IBM T20, T21, T22
https://bugs.launchpad.net/bugs/33617
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