Panic in radeon_get_vblank_counter()

[Sean C. Farley]

On Fri, 13 Mar 2009, Robert Noland wrote:

> On Fri, 2009-03-13 at 15:49 -0500, Sean C. Farley wrote:
>> After upgrading my laptop (Dell 600m) yesterday, I have begun to 
>> experience panics on it probably related to the DRM update.
>>
>> Killing the X server by Ctrl-Alt-Backspace is a good way to lock the 
>> system.  Reboot to get a core dump.
>>
>> Piece of Xorg.log concerning the hardware using the
>> xf86-video-ati-6.11.0 driver:
>> (--) PCI:*(0 at 1:0:0) ATI Technologies Inc Radeon RV250 [Mobility FireGL 9000] rev 1, Mem @ 0xe8000000/0, 0xfcff0000/0, I/O @ 0x0000c000/0, BIOS @ 0x????????/65536
>> ...
>> (--) RADEON(0): Chipset: "ATI Radeon Mobility 9000 (M9) Lf (AGP)" (ChipID = 0x4c66)
>>
>>
>> Special options in xorg.conf:
>> Section "Device"
>>      ...
>>      Option     "EnablePageFlip"             "true"
>>      Option     "AccelMethod"                "EXA"
>> EndSection
>>
>> Section "Screen"
>>      ...
>>      Option "AddARGBGLXVisuals" "True"
>>      Option "DisableGLXRootClipping" "True"
>>      Option "XAANoOffscreenPixmaps" "True"
>>      ...
>> EndSection
>>
>>
>> pciconf -lv of the device:
>> vgapci0 at pci0:1:0:0:     class=0x030000 card=0x011e1028 chip=0x4c661002 rev=0x01 hdr=0x00
>>      vendor     = 'ATI Technologies Inc'
>>      device     = 'ATI MOBILITY RADEON 9000 (Microsoft Corporation - Radeon Mobility M9'
>>      class      = display
>>      subclass   = VGA
>>
>>
>> /var/log/messages about drm:
>> Mar 13 15:41:51 baba kernel: drm0: <ATI Radeon Lf RV250 Mobility 9000 M9 / FireMV 2400 PCI> on vgapci0
>> Mar 13 15:41:51 baba kernel: vgapci0: child drm0 requested pci_enable_busmaster
>> Mar 13 15:41:51 baba kernel: info: [drm] AGP at 0xe0000000 128MB
>> Mar 13 15:41:51 baba kernel: info: [drm] Initialized radeon 1.29.0 20080613
>> Mar 13 15:41:52 baba kernel: info: [drm] Setting GART location based on new memory map
>> Mar 13 15:41:52 baba kernel: info: [drm] Loading R200 Microcode
>> Mar 13 15:41:52 baba kernel: info: [drm] writeback test succeeded in 1 usecs
>> Mar 13 15:41:52 baba kernel: drm0: [ITHREAD]
>
> Ok, I'll try to look at this soon... It would be useful if you could 
> enable hw.dri.0.debug=1 and send me the debug output as well, if you 
> can get anything useful before it locks up.

I have not had luck reproducing a panic, but I can get the computer to 
lock up at startup of the X server (rarely) and shutdown (often).

This may not be accurate, but I think I am able to shutdown safely if I 
switch to a tty and wait until this debug line is printed:
[drm:pid13:vblank_disable_fn] vblank_disable_allowed=1

If I start rebooting before it is printed, the system locks up.  Of 
course, this is only after rebooting several times.

Here is a successful start and shutdown:
http://people.freebsd.org/~scf/drm-dmesg.log
http://people.freebsd.org/~scf/Xorg.0.log

Does that help?

Sean
-- 
scf at FreeBSD.org