[Bug 71906] [BDW] *ERROR* mismatch in ips_enabled (expected 1, found 0)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71906

--- Comment #9 from lu hua <huax.lu at intel.com> ---
run  ./testdisplay, It also fails with this error.

output:
CRTC(3):[0]  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48
138780
CRTC(3):[1]  1920x1080 40 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x40
92520

dmesg
[ 2110.408042] [drm:intel_pipe_config_compare] *ERROR* mismatch in ips_enabled
(expected 1, found 0)
[ 2110.408049] ------------[ cut here ]------------
[ 2110.408078] WARNING: CPU: 0 PID: 11995 at
drivers/gpu/drm/i915/intel_display.c:9498 check_crtc_state+0x7fd/0x844 [i915]()
[ 2110.408081] pipe state doesn't match!
[ 2110.408083] Modules linked in: tcp_lp bnep bluetooth rfkill ip6table_filter
ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables ipv6 dm_mod
iTCO_wdt iTCO_vendor_support pcspkr i2c_i801 lpc_ich mfd_core snd_hda_intel
snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_timer snd soundcore battery
ac acpi_cpufreq joydev i915 video button drm_kms_helper drm
[ 2110.408116] CPU: 0 PID: 11995 Comm: testdisplay Tainted: G        W   
3.13.0-rc4_drm-intel-nightly_5f7867_20131226+ #10
[ 2110.408119]  0000000000000000 0000000000000009 ffffffff81711fd2
ffff88009ffad8b8
[ 2110.408123]  ffffffff8103312a ffff88009ffad8b0 ffffffffa007fc96
0000000000000018
[ 2110.408127]  ffff88014a384000 ffff880002da1000 ffff88009ffad948
ffff88014a3846e0
[ 2110.408132] Call Trace:
[ 2110.408141]  [<ffffffff81711fd2>] ? dump_stack+0x41/0x51
[ 2110.408149]  [<ffffffff8103312a>] ? warn_slowpath_common+0x73/0x8b
[ 2110.408165]  [<ffffffffa007fc96>] ? check_crtc_state+0x7fd/0x844 [i915]
[ 2110.408171]  [<ffffffff810331da>] ? warn_slowpath_fmt+0x45/0x4a
[ 2110.408189]  [<ffffffffa00937fa>] ? intel_ddi_get_config+0xd5/0x12b [i915]
[ 2110.408203]  [<ffffffffa007fc96>] ? check_crtc_state+0x7fd/0x844 [i915]
[ 2110.408222]  [<ffffffffa008a7de>] ? intel_modeset_check_state+0x359/0x601
[i915]
[ 2110.408236]  [<ffffffffa008aaa3>] ? intel_set_mode+0x1d/0x27 [i915]
[ 2110.408250]  [<ffffffffa008b0b1>] ? intel_crtc_set_config+0x604/0x7fe [i915]
[ 2110.408266]  [<ffffffffa000c9c2>] ? drm_mode_set_config_internal+0x44/0xac
[drm]
[ 2110.408278]  [<ffffffffa000eacc>] ? drm_mode_setcrtc+0x3ea/0x49a [drm]
[ 2110.408289]  [<ffffffffa0002f37>] ? drm_ioctl+0x263/0x385 [drm]
[ 2110.408296]  [<ffffffff8134ed5d>] ? pty_write+0x44/0x4e
[ 2110.408305]  [<ffffffffa000e6e2>] ? drm_mode_setplane+0x317/0x317 [drm]
[ 2110.408311]  [<ffffffff810e90e8>] ? do_vfs_ioctl+0x3f1/0x43a
[ 2110.408316]  [<ffffffff810e917f>] ? SyS_ioctl+0x4e/0x7b
[ 2110.408321]  [<ffffffff8171c5e2>] ? system_call_fastpath+0x16/0x1b
[ 2110.408324] ---[ end trace 87c2d7e24610bbad ]---

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