[Bug 90237] [SKL desktop] "testdisplay -a" causes Call Trace

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90237

--- Comment #2 from xubin <bin.a.xu at intel.com> ---

Tested on SKLY03 with the testing kernel drm-intel-testing-2015-05-08.
this problem still exists.

Dmesg:
[ 2604.315080] Call Trace:
[ 2604.315091]  [<ffffffff817a66cc>] ? dump_stack+0x40/0x50
[ 2604.315096]  [<ffffffff8103ebde>] ? warn_slowpath_common+0x98/0xb0
[ 2604.315125]  [<ffffffffa00ca3b0>] ? check_crtc_state+0xb67/0xbd1 [i915]
[ 2604.315129]  [<ffffffff8103ec3b>] ? warn_slowpath_fmt+0x45/0x4a
[ 2604.315157]  [<ffffffffa00ca3b0>] ? check_crtc_state+0xb67/0xbd1 [i915]
[ 2604.315195]  [<ffffffffa00d959d>] ? intel_modeset_check_state+0x610/0x9e9
[i915]
[ 2604.315226]  [<ffffffffa00d9db8>] ? intel_crtc_set_config+0x3f8/0x531 [i915]
[ 2604.315241]  [<ffffffffa0018203>] ? drm_modeset_lock+0x4e/0xa3 [drm]
[ 2604.315261]  [<ffffffffa000c2be>] ? drm_mode_set_config_internal+0x4e/0xd2
[drm]
[ 2604.315270]  [<ffffffffa0058fc5>] ? restore_fbdev_mode+0xac/0xc3
[drm_kms_helper]
[ 2604.315277]  [<ffffffffa005a7c6>] ?
drm_fb_helper_restore_fbdev_mode_unlocked+0x1e/0x54 [drm_kms_helper]
[ 2604.315284]  [<ffffffffa005a82a>] ? drm_fb_helper_set_par+0x2e/0x32
[drm_kms_helper]
[ 2604.315314]  [<ffffffffa00e65e7>] ? intel_fbdev_set_par+0x11/0x55 [i915]
[ 2604.315321]  [<ffffffff81344e3d>] ? number.isra.13+0x11f/0x215
[ 2604.315328]  [<ffffffff81386585>] ? fb_set_var+0x250/0x33b
[ 2604.315332]  [<ffffffff810e93e4>] ? shmem_undo_range+0x455/0x46b
[ 2604.315337]  [<ffffffff81345aaa>] ? vsnprintf+0x83/0x3b9
[ 2604.315343]  [<ffffffff8137f131>] ? fbcon_blank+0x75/0x228
[ 2604.315347]  [<ffffffff810df8f8>] ? file_ra_state_init+0xc/0x1d
[ 2604.315353]  [<ffffffff813d5f89>] ? do_unblank_screen+0xef/0x168
[ 2604.315358]  [<ffffffff813ce679>] ? vt_ioctl+0x4de/0xf59
[ 2604.315364]  [<ffffffff813c5cf8>] ? tty_ioctl+0x954/0x9ba
[ 2604.315368]  [<ffffffff811217ff>] ? do_filp_open+0x2b/0x6f
[ 2604.315372]  [<ffffffff81123502>] ? do_vfs_ioctl+0x360/0x424
[ 2604.315376]  [<ffffffff8112ae24>] ? __fd_install+0x15/0x40
[ 2604.315380]  [<ffffffff8112360f>] ? SyS_ioctl+0x49/0x7a
[ 2604.315384]  [<ffffffff817ac217>] ? system_call_fastpath+0x12/0x6a
[ 2604.315387] ---[ end trace 8103221c8aae6c4b ]---

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