I'm encountering the same problems with my Dell Inspiron 1525 and Xubuntu 14.04 (Trusty Tahr) x86_64. Most any display change (blanking, add/removing external monitor) results in a non-fatal error:
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784402] CPU: 1 PID: 1546 Comm: Xorg Tainted: PF W O 3.13.0-24-generic #46-Ubuntu
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784407] Hardware name: Dell Inc. Inspiron 1525 /0U990C, BIOS A11 03/10/2008
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784412] 0000000000000009 ffff88007918dbb8 ffffffff81715a64 0000000000000000
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784423] ffff88007918dbf0 ffffffff810676bd ffff880035d0b000 0000000000000000
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784433] ffff880035c17800 ffff880035c17af8 ffff880056704ca0 ffff88007918dc00
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784443] Call Trace:
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784456] [<ffffffff81715a64>] dump_stack+0x45/0x56
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784467] [<ffffffff810676bd>] warn_slowpath_common+0x7d/0xa0
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784475] [<ffffffff8106779a>] warn_slowpath_null+0x1a/0x20
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784521] [<ffffffffa00ba232>] intel_modeset_check_state+0x6f2/0x780 [i915]
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784568] [<ffffffffa00ba355>] intel_set_mode+0x25/0x30 [i915]
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784615] [<ffffffffa00babfb>] intel_crtc_set_config+0x7ab/0x9a0 [i915]
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784657] [<ffffffffa000fe9d>] drm_mode_set_config_internal+0x5d/0xe0 [drm]
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784696] [<ffffffffa0012d87>] drm_mode_setcrtc+0xf7/0x5e0 [drm]
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784725] [<ffffffffa0003c22>] drm_ioctl+0x502/0x630 [drm]
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784743] [<ffffffff811cc6e0>] do_vfs_ioctl+0x2e0/0x4c0
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784752] [<ffffffff8109dd84>] ? vtime_account_user+0x54/0x60
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784761] [<ffffffff811cc941>] SyS_ioctl+0x81/0xa0
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784771] [<ffffffff8172663f>] tracesys+0xe1/0xe6
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784776] ---[ end trace 7832e5d6c3fcdce6 ]---
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.790057] ------------[ cut here ]------------
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.790120] WARNING: CPU: 1 PID: 1546 at /build/buildd/linux-3.13.0/drivers/gpu/drm/i915/intel_display.c:9226 intel_modeset_check_state+0x62d/0x780 [i915]()
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.790123] encoder's hw state doesn't match sw tracking (expected 0, found 1)
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.790125] Modules linked in:...
Suspend/hibernate fails also. Closing the lid results in a freeze.
I'm encountering the same problems with my Dell Inspiron 1525 and Xubuntu 14.04 (Trusty Tahr) x86_64. Most any display change (blanking, add/removing external monitor) results in a non-fatal error:
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784402] CPU: 1 PID: 1546 Comm: Xorg Tainted: PF W O 3.13.0-24-generic #46-Ubuntu a64>] dump_stack+ 0x45/0x56 6bd>] warn_slowpath_ common+ 0x7d/0xa0 79a>] warn_slowpath_ null+0x1a/ 0x20 232>] intel_modeset_ check_state+ 0x6f2/0x780 [i915] 355>] intel_set_ mode+0x25/ 0x30 [i915] bfb>] intel_crtc_ set_config+ 0x7ab/0x9a0 [i915] e9d>] drm_mode_ set_config_ internal+ 0x5d/0xe0 [drm] d87>] drm_mode_ setcrtc+ 0xf7/0x5e0 [drm] c22>] drm_ioctl+ 0x502/0x630 [drm] 6e0>] do_vfs_ ioctl+0x2e0/ 0x4c0 d84>] ? vtime_account_ user+0x54/ 0x60 941>] SyS_ioctl+0x81/0xa0 63f>] tracesys+0xe1/0xe6 buildd/ linux-3. 13.0/drivers/ gpu/drm/ i915/intel_ display. c:9226 intel_modeset_ check_state+ 0x62d/0x780 [i915]()
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784407] Hardware name: Dell Inc. Inspiron 1525 /0U990C, BIOS A11 03/10/2008
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784412] 0000000000000009 ffff88007918dbb8 ffffffff81715a64 0000000000000000
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784423] ffff88007918dbf0 ffffffff810676bd ffff880035d0b000 0000000000000000
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784433] ffff880035c17800 ffff880035c17af8 ffff880056704ca0 ffff88007918dc00
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784443] Call Trace:
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784456] [<ffffffff81715
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784467] [<ffffffff81067
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784475] [<ffffffff81067
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784521] [<ffffffffa00ba
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784568] [<ffffffffa00ba
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784615] [<ffffffffa00ba
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784657] [<ffffffffa000f
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784696] [<ffffffffa0012
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784725] [<ffffffffa0003
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784743] [<ffffffff811cc
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784752] [<ffffffff8109d
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784761] [<ffffffff811cc
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784771] [<ffffffff81726
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.784776] ---[ end trace 7832e5d6c3fcdce6 ]---
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.790057] ------------[ cut here ]------------
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.790120] WARNING: CPU: 1 PID: 1546 at /build/
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.790123] encoder's hw state doesn't match sw tracking (expected 0, found 1)
May 20 19:03:18 jhansonxi-l4 kernel: [ 8205.790125] Modules linked in:...
Suspend/hibernate fails also. Closing the lid results in a freeze.
The "encoder's hw state doesn't match sw tracking" seems to be the problem. A fix for the same error was made last year: linux-kernel. 2935.n7. nabble. com/Re- Re-drm- i915-new- warning- regression- in-3-7- 10-and- 3-8-3-td631548. html /bugzilla. redhat. com/show_ bug.cgi? id=962386
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The current problem may be another regression. Others encountered a similar problem with 3.13: /lkml.org/ lkml/2013/ 12/17/796
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