[i855] [jaunty] external monitor makes X fail

Bug #327107 reported by Jacob Emcken
2
Affects Status Importance Assigned to Milestone
xserver-xorg-video-intel (Ubuntu)
Confirmed
Undecided
Unassigned

Bug Description

Binary package hint: xserver-xorg-video-intel

I have an IBM x40 laptop and ran into this problem when attaching an external screen with the resolution of 1920x1200 (LG 24") the normal resolution of the LVDS is 1024x768.

If I booted the machine without the external screen I could login and use the Compiz no problem. If I attached an external screen while in Gnome the resolution manager wouldn't find the new screen. So I log out while the external screen is attached and the screen would flicker a few times and start in fail safe mode. If I detached the external screen and restart GDM... I'm back in a working system but can't use my external screen.

If I had the external monitor detached but set the Virtual resolution to 1920x1200 instead - it would still trigger the error.
This might be a way to reproduce without having an external monitor.

My error message is slightly different than in bug #304871 (notice BACK buffer), but still might be a dupe?:

[1 sec: 398636 usec](EE) intel(0): Failed to pin back buffer: Cannot allocate memory
[1 sec: 398707 usec]
Fatal server error:
[1 sec: 398723 usec]Couldn't bind memory for BO back buffer

But using the same workaround as in bug #304871 works:

    Setting 'Option "DRI" "false"

Now I can use my external screen in 1920x1600 but without Compiz.
With DRI enabled I was able to go as high as 1680x1050 using Virtual. It gave weird graphic errors though so I gave it up.

[lspci]
00:00.0 Host bridge [0600]: Intel Corporation 82852/82855 GM/GME/PM/GMV Processor to I/O Controller [8086:3580] (rev 02)
 Subsystem: IBM Device [1014:055c]
00:02.0 VGA compatible controller [0300]: Intel Corporation 82852/855GM Integrated Graphics Device [8086:3582] (rev 02)
 Subsystem: IBM Device [1014:0557]

Revision history for this message
Jacob Emcken (jacob-emcken) wrote :
Revision history for this message
Jacob Emcken (jacob-emcken) wrote :
Revision history for this message
Jacob Emcken (jacob-emcken) wrote :
Geir Ove Myhr (gomyhr)
description: updated
Bryce Harrington (bryce)
Changed in xserver-xorg-video-intel:
status: New → Confirmed
Geir Ove Myhr (gomyhr)
tags: added: dual-head
removed: external
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