Hello When loading i915 with macboopro6,2 (with debug on) the following shows:
--- [drm:pid1201:do_gmbus_xfer] GMBUS [i915 gmbus panel] NAK for addr: 0050 w(1) [drm:pid1201:do_gmbus_xfer] GMBUS [i915 gmbus panel] NAK on first message, retry [drm:pid1201:do_gmbus_xfer] GMBUS [i915 gmbus panel] NAK for addr: 0050 w(1) [drm:pid1201:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus panel [drm:pid1201:intel_lvds_init] No LVDS modes found, disabling. --- and the result is a frozen screen. The keyboard works and I can ssh to the machine to reboot. However, linux-4.9 gives --- [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus panel] timed out after NAK [ 5.668588] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus panel] NAK for addr: 0050 w(1) [ 5.683016] [drm:intel_lvds_init [i915]] using preferred mode from EDID: [ 5.683070] [drm:drm_mode_debug_printmodeline [drm]] Modeline 35:"1680x1050" 60 119000 1680 1728 1760 1840 1050 1053 1059 1080 0x48 0xa --- and the screen/keyboard work fine. I am focusing on intel_lvds.c to bring it closer to drm/i915 linux-4.9; however, maybe I am missing something obvious---can anyone give suggestions as to where else to look? Cheers Peeter --