[Bug 76103] [915GM regression] black screen on boot Linux >= 3.14-rc1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76103

--- Comment #15 from Krzysztof Mazur <krzysiek at podlesie.net> ---
Linux v3.14-rc6-26-g33807f4 +
0001-drm-i915-Repartition-the-display-FIFO-manyally-on-ge.patch still does not
work and introduces another regression:
during the VT change from a framebuffer to X some artifacts are visible and
pipe underrun occurs:

...
[  388.668402] [drm:check_encoder_state], [ENCODER:6:LVDS-6]
[  388.668405] [drm:check_encoder_state], [ENCODER:12:DAC-12]
[  388.668408] [drm:check_encoder_state], [ENCODER:14:TV-14]
[  388.668411] [drm:check_crtc_state], [CRTC:3]
[  388.668413] [drm:check_crtc_state], [CRTC:4]
[  388.668560] [drm:drm_helper_probe_single_connector_modes],
[CONNECTOR:13:SVIDEO-1] disconnected
[  388.967210] [drm:i915_irq_handler], pipe B underrun


The CPU enters C3 before and after X server startup. Before:
$ cat /sys/devices/system/cpu/cpu0/cpuidle/state*/time
15
3610
235270
15333732

BTW. Starting kmscon is also sufficient to fixup the display.

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