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View Full Version : Latest X11 DRM modules won't load with kernel 2.6.25

RealNC
08-09-2008, 07:14 PM
The latest DRM kernel modules from git master build fine but won't load with kernel 2.6.25.11. A "modprobe drm" results in:

drm: Unknown symbol shmem_file_setup

Not sure how to resolve this.
Kano
08-09-2008, 07:48 PM
You usually have parts of the drm modules already loaded, reboot and it should work.
bridgman
08-09-2008, 07:51 PM
It looks like the shmem_file_setup reference was added during the GEM merge over the last couple of days. You might want to mention this on the #dri-devel IRC or mailing list. It may be as simple as needing another package to support shmfs but I'm guessing there.
bridgman
08-09-2008, 07:58 PM
I'm not up on the details but it looks like some bits were added late in 2.6.26 to support GEM and this call was one of the ones mentioned.
RealNC
08-09-2008, 07:58 PM
You usually have parts of the drm modules already loaded, reboot and it should work.
Unfortunately, nope; this wasn't the problem.

Not 100% sure but it looks like the shmem_file_setup reference was added during the GEM merge over the last couple of days. You might want to mention this on the #dri-devel IRC or mailing list.
I've emailed dri-users@lists.sourceforge.net.

I've found this: http://www.opensubscriber.com/message/dri-devel@lists.sourceforge.net/9353749.html

Not sure what's going on exactly. Does that mean an upstream patch to mm/shmem.c is required?
Kano
08-09-2008, 08:02 PM
It looks like that 2.6.26.3 could add that hotfix ;) Well in that case you have to compile your kernel on your own with that added EXPORT_SYMBOL(shmem_file_setup).
RealNC
08-09-2008, 08:13 PM
This looks innocent enough so I've added the export. The modules load fine now. I really hope this gets backported to 2.6.25 since 2.6.26 has IRQ problems with my graphics card :P
butdie
08-10-2008, 08:55 PM
with 2.6.26, the screen goes blank when startx, and a reboot is required before I could see anything on screen

now, drm module won't load with 2.6.25

is the open source support being downgraded to fglrx level?

This looks innocent enough so I've added the export. The modules load fine now. I really hope this gets backported to 2.6.25 since 2.6.26 has IRQ problems with my graphics card :P
RealNC
08-10-2008, 09:07 PM
I had other problems with 2.6.26 but not the one you describe. In any event, this *is* supposed to work with 2.6.26.

It is natural for the module not to load with 2.6.25; you must compile it against the same kernel you're running. That is, when compiling the modules, make sure /usr/src/linux points to the correct kernel source version.
butdie
08-10-2008, 09:27 PM
the 2.6.25 issue being fixed in mesa/drm -git

I had other problems with 2.6.26 but not the one you describe. In any event, this *is* supposed to work with 2.6.26.

It is natural for the module not to load with 2.6.25; you must compile it against the same kernel you're running. That is, when compiling the modules, make sure /usr/src/linux points to the correct kernel source version.