<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [BYT][VLV] No picture on DSI display after DRM loads on Teclast X80H tablet" href="https://bugs.freedesktop.org/show_bug.cgi?id=96996#c14">Comment # 14</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [BYT][VLV] No picture on DSI display after DRM loads on Teclast X80H tablet" href="https://bugs.freedesktop.org/show_bug.cgi?id=96996">bug 96996</a> from <a class="email" href="mailto:mail@schorn-stephan.de" title="Stephan Schorn <mail@schorn-stephan.de>"> Stephan Schorn</a> <pre>I compared the working dmesgs with the non-working dmesgs. 4.6.7 Kernel with fastboot=1 from Laszlo Fiat [drm:intel_plane_atomic_calc_changes] [CRTC:26] has [PLANE:23] with fb 50 [drm:intel_plane_atomic_calc_changes] [PLANE:23] visible 1 -> 1, off 0, on 0, ms 0 [drm:drm_atomic_commit] commiting ffff88007529e400 [drm:intel_update_pipe_config] Updating pipe size 800x1280 -> 800x1280 [drm:intel_connector_check_state] [CONNECTOR:46:DSI-1] [drm:intel_dsi_get_hw_state] 4.6.7 Kernel with fastboot=0 from Laszlo Fiat [drm:intel_modeset_checks] New cdclk calculated to be atomic 266667, actual 266667 [drm:intel_plane_atomic_calc_changes] [CRTC:26] has [PLANE:23] with fb 50 [drm:intel_plane_atomic_calc_changes] [PLANE:23] visible 1 -> 1, off 1, on 1, ms 1 [drm:drm_atomic_commit] commiting ffff880036c03a00 [drm:intel_set_memory_cxsr] memory self-refresh is disabled [drm:intel_set_memory_cxsr] memory self-refresh is disabled [drm:intel_dsi_pre_disable] [drm:intel_disable_pipe] disabling pipe A 4.9.0 Kernel with fastboot=0 from Laszlo Fiat [drm:intel_atomic_check [i915]] New cdclk calculated to be atomic 266667, actual 266667 [drm:intel_plane_atomic_calc_changes [i915]] [CRTC:33:pipe A] has [PLANE:25:primary A] with fb 60 [drm:intel_plane_atomic_calc_changes [i915]] [PLANE:25:primary A] visible 1 -> 1, off 1, on 1, ms 1 [drm:drm_atomic_commit [drm]] commiting ffff963535f88800 [drm:_intel_set_memory_cxsr [i915]] memory self-refresh is disabled (was disabled) [drm:intel_dsi_pre_disable [i915]] [drm:intel_disable_pipe [i915]] disabling pipe A 4.10.0 Kernel with fastboot=0 from me [drm:intel_atomic_check [i915]] New cdclk calculated to be atomic 266667, actual 266667 [drm:intel_plane_atomic_calc_changes [i915]] [CRTC:33:pipe A] has [PLANE:25:primary A] with fb 60 [drm:intel_plane_atomic_calc_changes [i915]] [PLANE:25:primary A] visible 1 -> 1, off 1, on 1, ms 1 [drm:drm_atomic_commit [drm]] commiting ffff97c4b5124c00 [drm:_intel_set_memory_cxsr [i915]] memory self-refresh is disabled (was disabled) [drm:intel_dsi_pre_disable [i915]] [drm:intel_disable_pipe [i915]] disabling pipe A 4.10.0 Kernel with fastboot=1 from me [drm:intel_atomic_check [i915]] New cdclk calculated to be atomic 266667, actual 266667 [drm:intel_plane_atomic_calc_changes [i915]] [CRTC:33:pipe A] has [PLANE:25:primary A] with fb 60 [drm:intel_plane_atomic_calc_changes [i915]] [PLANE:25:primary A] visible 1 -> 1, off 1, on 1, ms 1 [drm:drm_atomic_commit [drm]] commiting ffff8907f567f400 [drm:_intel_set_memory_cxsr [i915]] memory self-refresh is disabled (was disabled) [drm:intel_dsi_pre_disable [i915]] [drm:intel_disable_pipe [i915]] disabling pipe A If you boot with fastboot, the modeset_checks a.k.a atomic_checks didn't happen, but they do now. They cause off, on and ms to change from 0 to 1. And they cause this strange "corretion" of the value 266667 to 266667. So, I think the error is in this check routine. Although, it doesnt't seem to be related with my resolution idea. <a href="http://lxr.free-electrons.com/source/drivers/gpu/drm/i915/intel_display.c#L14006">http://lxr.free-electrons.com/source/drivers/gpu/drm/i915/intel_display.c#L14006</a> <a href="http://lxr.free-electrons.com/source/drivers/gpu/drm/i915/intel_display.c#L13921">http://lxr.free-electrons.com/source/drivers/gpu/drm/i915/intel_display.c#L13921</a></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>