Bug 3834

Summary:	Only first X server can do DRI
Product:	DRI	Reporter:	Simon Farnsworth <freedesktop>
Component:	General	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:
Severity:	enhancement
Priority:	lowest	CC:	linulin, maurotorrez
Version:	XOrg git
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Simon Farnsworth 2005-07-21 17:41:06 UTC

I run Xorg 6.8.99.15, and I've just started using KDE's fast user switching,  
which fires up a new X server instance for each user. I've noticed that the  
second user get a very slow X server compared to the first user, and upon  
looking in Xorg.0.log and Xorg.1.log, noticed that Xorg.1.log contains the 
following: 
 
drmOpenDevice: node name is /dev/dri/card0 
drmOpenDevice: open result is 6, (OK) 
drmOpenDevice: node name is /dev/dri/card0 
drmOpenDevice: open result is 6, (OK) 
drmOpenByBusid: Searching for BusID pci:0000:01:00.0 
drmOpenDevice: node name is /dev/dri/card0 
drmOpenDevice: open result is 6, (OK) 
drmOpenByBusid: drmOpenMinor returns 6 
drmOpenByBusid: drmGetBusid reports pci:0000:01:00.0 
(II) RADEON(0): [drm] DRM interface version 1.2 
(II) RADEON(0): [drm] created "radeon" driver at busid "pci:0000:01:00.0" 
(II) RADEON(0): [drm] drmAddMap failed 
(EE) RADEON(0): [dri] DRIScreenInit failed.  Disabling DRI. 
 
Xorg.0.log contains the following in the same place: 
 
drmOpenDevice: node name is /dev/dri/card0 
drmOpenDevice: open result is -1, (No such device or address) 
drmOpenDevice: open result is -1, (No such device or address) 
drmOpenDevice: Open failed 
drmOpenDevice: node name is /dev/dri/card0 
drmOpenDevice: open result is -1, (No such device or address) 
drmOpenDevice: open result is -1, (No such device or address) 
drmOpenDevice: Open failed 
drmOpenByBusid: Searching for BusID pci:0000:01:00.0 
drmOpenDevice: node name is /dev/dri/card0 
drmOpenDevice: open result is 6, (OK) 
drmOpenByBusid: drmOpenMinor returns 6 
drmOpenByBusid: drmGetBusid reports pci:0000:01:00.0 
(II) RADEON(0): [drm] loaded kernel module for "radeon" driver 
(II) RADEON(0): [drm] DRM interface version 1.2 
(II) RADEON(0): [drm] created "radeon" driver at busid "pci:0000:01:00.0" 
(II) RADEON(0): [drm] added 8192 byte SAREA at 0xf91d1000 
(II) RADEON(0): [drm] mapped SAREA 0xf91d1000 to 0xafa8e000 
 
If I'm understanding correctly, this means that the accelerator on my Radeon 
9200SE card is only used in DMA mode (for Render and XV acceleration) on the 
first instance, and not the second. Since both instances are exclusive 
(different virtual terminals on the same console), it would be nice to have 
acceleration available on both heads. 
 
I've marked this as low priority, and severity enhancement, since it's just a 
nicety at the moment, but if someone has time and energy available, I'd 
appreciate it being looked into.

Comment 1 Simon Farnsworth 2005-07-21 17:42:00 UTC

Created attachment 3116 [details]
Screenshot of the borked colours

This is the Xorg log for the first instance of the server.

Comment 2 Simon Farnsworth 2005-07-21 17:43:01 UTC

Created attachment 3117 [details]
Screenshot of correct colours

This is the Xorg log for the second instance of the server (the one that
doesn't have a full set of acceleration).

Comment 3 Simon Farnsworth 2005-07-21 17:43:48 UTC

Created attachment 3118 [details]
Example of Magnified PostScript file

In case it's relevant, my xorg.conf - any other relevant files can be supplied.

Comment 4 Dan Ballard 2005-08-03 13:25:48 UTC

I'm using 6.8.99.15 with a i915 graphics chip and am also experienceing the same
problem.  It's kind of a bummer since I normally rin my games of a second X
session becasue with the instability of binary games and the beta i915 driver
they crash a bunch and I prefer it not taking down my main X session.  Oh well
for now.  Still, thanks for getting the i915 working :)

Comment 5 Neil Skrypuch 2005-12-09 17:27:08 UTC

I get the same issue with a Radeon 7500 Mobility. Interestingly though, I 
still get EXA acceleration and such for both X servers, even if no 3D 
acceleration is available for the second X server. I believe the proprietary 
NVidia drivers can 3D accelerate 2+ X servers, although I don't have access to 
any NVidia hardware at the moment, so I can't check for sure, but it should be 
possible for Radeons too.

Comment 6 unggnu 2007-09-07 12:16:42 UTC

I experiencing the same issue. I have an Intel 915 chipset and it isn't possible to use Compiz for more than one user.
I am using Ubuntu 7.10 Testing.

Comment 7 unggnu 2010-03-16 08:25:26 UTC

Closing since current -intel, -radeon and noveau should support DRI2.

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