Messages in this thread | | | Date | Tue, 3 Feb 2009 11:03:28 +0100 | From | Daniel Vetter <> | Subject | Re: + drivers-gpu-drm-i915-intel_lvdsc-fix-locking-snafu.patch added to -mm tree |
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On Mon, Feb 02, 2009 at 10:44:48PM -0800, Andrew Morton wrote: > > Enabling kms works flawlessly now, but when I fire up X, the screen blanks > > (no more blinking cursors), then X hangs. vt-switchings doesn't work > > anymore, otherwise the machine looked fine (ping on the network was fine, > > couldn't check anything else for lack of a running sshd on the crashing > > machine). Twice using SysRq-T (half a minute in between) showed that Xorg > > was indeed stuck, both times with the exact same backtrace: > > > > Xorg D 00203246 6448 6049 6048 > > f1c81df0 00203046 f6322720 00203246 f1c81de0 f83fb98d f6322720 f632297c > > 00203046 f1d88444 00203046 f2f63cc0 f8388dae f1d88444 ffffffff f1d88408 > > 00203246 f1c81e2c c02e18ba f83fb98d 00000000 f6322720 f1d88430 f1d88444 > > Call Trace: > > [<f83fb98d>] ? intel_lvds_get_modes+0x69/0x94 [i915] > > [<f8388dae>] ? drm_mode_getconnector+0x54/0x31f [drm] > > [<c02e18ba>] mutex_lock_nested+0x158/0x254 > > [<f83fb98d>] ? intel_lvds_get_modes+0x69/0x94 [i915] > > [<f83fb98d>] intel_lvds_get_modes+0x69/0x94 [i915] > > [<f838a170>] drm_helper_probe_single_connector_modes+0xb8/0x194 [drm] > > [<f8388e20>] drm_mode_getconnector+0xc6/0x31f [drm] > > [<c02e13bc>] ? mutex_unlock+0xd/0xf > > [<f837f71f>] drm_ioctl+0x1c1/0x23d [drm] > > [<f8388d5a>] ? drm_mode_getconnector+0x0/0x31f [drm] > > [<f837f55e>] ? drm_ioctl+0x0/0x23d [drm] > > [<c0191277>] vfs_ioctl+0x43/0x56 > > [<c0191a34>] do_vfs_ioctl+0x49f/0x4e0 > > [<c0186c42>] ? vfs_write+0xf5/0x131 > > [<c0191aba>] sys_ioctl+0x45/0x5f > > [<c0102e91>] sysenter_do_call+0x12/0x31 > > > > This is on 2.6.29-rc3-00100-gf2257b7. > > > > So I assume that it would make sense to track this as a post-2.6.28 > regression?
Nope. Like the previous issue it only happens when I run-time enable kernel modesetting (with # modprobe i915 modeset=1), which is not the default.
I'm gonna open a new bz entry with all the details (and all the people on cc minus regression handlers). But first I'll check with CONFIG_LOCKDEP whether it's really a locking goof-up.
-Daniel
-- Daniel Vetter E-Mail: daniel.vetter@ffwll.ch Tel.: +41 (0)79 365 57 48
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