Between 4.4-rc3 and 4.4-rc4, i915 modesetting broke on my i5-2400 PC. Instead of seeing the new dense graphics mode, I see the last VGA text lines and no X appears either.
I saw something similar on I865G but have not had time to check if it is the same issue.
ac9b8236551d1177fd07b56aef9b565d1864420d is the first bad commit commit ac9b8236551d1177fd07b56aef9b565d1864420d Author: Ville Syrjälä ville.syrjala@linux.intel.com Date: Fri Nov 27 18:55:26 2015 +0200
drm/i915: Introduce a gmbus power domain
Currently the gmbus code uses intel_aux_display_runtime_get/put in an effort to make sure the hardware is powered up sufficiently for gmbus. That function only takes the runtime PM reference which on VLV/CHV/BXT is not enough. We need the disp2d/pipe-a well on VLV/CHV and power well 2 on BXT. So add a new power domnain for gmbus and kill off the now unused intel_aux_display_runtime_get/put. And change intel_hdmi_set_edid() to use the gmbus power domain too since that's all we need there.
Also toss in a BUILD_BUG_ON() to catch problems if we run out of bits for power domains. We're already really close to the limit...
[Patrik: Add gmbus string to debugfs output]
Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com Reviewed-by: Patrik Jakobsson patrik.jakobsson@linux.intel.com [Cherry-picked from drm-intel-next-queued f0ab43e6 (Imre)] Signed-off-by: Imre Deak imre.deak@intel.com Link: http://patchwork.freedesktop.org/patch/msgid/1448643329-18675-3-git-send-ema... Signed-off-by: Jani Nikula jani.nikula@intel.com
:040000 040000 39379146d7e6dda8a4d5f8781ee3d307cce8c47e f4f09fae0485ad6263d31d425296fa9cd7de343b M drivers