[Bug 86233] [HSW regression] PCH transcoder A FIFO underrun while hot-plug VGA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86233

Li Xu <li.l.xu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|bisect_pending              |
             Status|NEW                         |ASSIGNED

--- Comment #1 from Li Xu <li.l.xu at intel.com> ---
I have find a good point with 0 ERROR of above,and a bad point with "*ERROR*
PCH transcoder A FIFO underrun" ,and try to bisect.Bisect log can be seen on
the bottom.But when I find the latest bad point:
dd7c0b66e5414c54a9af8f100cc904240bab5102
some other errors appear,part of them shows as :

[ 1110.785561] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO
underrun
[ 1110.794180] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun
[ 1110.820268] [drm:intel_update_fbc], more than one pipe active, disabling
compression
[ 1110.820272] [drm:intel_connector_check_state], [CONNECTOR:12:eDP-1]
[ 1110.820275] [drm:intel_connector_check_state], [CONNECTOR:9:VGA-1]
[ 1110.820277] [drm:check_encoder_state], [ENCODER:10:DAC-10]
[ 1110.820278] [drm:check_encoder_state], [ENCODER:11:TMDS-11]
[ 1110.820279] [drm:check_encoder_state], [ENCODER:19:TMDS-19]
[ 1110.820280] [drm:check_crtc_state], [CRTC:3]
[ 1110.820286] [drm:check_crtc_state], [CRTC:5]
[ 1110.820294] [drm:intel_pipe_config_compare] *ERROR* mismatch in port_clock
(expected 146250, foun                                                         
                                       d 270000)
[ 1110.821370] ------------[ cut here ]------------
[ 1110.822487] WARNING: CPU: 0 PID: 756 at
drivers/gpu/drm/i915/intel_display.c:9518 check_crtc_stat                      
                                                                         
e+0x7ca/0x838 [i915]()
[ 1110.823593] pipe state doesn't match!



git bisect log shows as follows:
git bisect start
# good: [4c0e552882114d1edb588242d45035246ab078a0] drm/i915: fix NULL deref in
the load detect code
git bisect good 4c0e552882114d1edb588242d45035246ab078a0
# bad: [b2040f6fed736ccd2319768bc59833abe74148b8] drm/i915: Remove erronous
WARN in the vlv pipe crc code
git bisect bad b2040f6fed736ccd2319768bc59833abe74148b8
# good: [82c477669a4665eb4e52030792051e0559ee2a36] Merge branch
'perf-urgent-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 82c477669a4665eb4e52030792051e0559ee2a36
# good: [f7a6ad9fa24e4511a143e2b7b8a0d55864fe2edf] Merge branch
'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
git bisect good f7a6ad9fa24e4511a143e2b7b8a0d55864fe2edf
# good: [d990ce0d5be15664546c12ef0bc63fab33f31aa3] Merge branches 'acpi-dock',
'acpi-scan' and 'acpi-pci-hotplug'
git bisect good d990ce0d5be15664546c12ef0bc63fab33f31aa3
# good: [7e9e148af01ef388efb6e2490805970be4622792] can: flexcan:
flexcan_open(): fix error path if flexcan_chip_start() fails
git bisect good 7e9e148af01ef388efb6e2490805970be4622792
# good: [c59224d1326e56febd279032248c58672df0f14d] Merge branch 'drm-fixes' of
git://people.freedesktop.org/~airlied/linux
git bisect good c59224d1326e56febd279032248c58672df0f14d
# good: [ca62eec4e524591b82d9edf7a18e3ae6b691517d] Merge branch
'for-3.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
git bisect good ca62eec4e524591b82d9edf7a18e3ae6b691517d
# bad: [dd7c0b66e5414c54a9af8f100cc904240bab5102] drm/i915: factor out
reset_vblank_counter
git bisect bad dd7c0b66e5414c54a9af8f100cc904240bab5102

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