<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - drm:intel_dp_start_link_train [i915] *ERROR* failed to enable link training" href="https://bugs.freedesktop.org/show_bug.cgi?id=109522#c29">Comment # 29</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - drm:intel_dp_start_link_train [i915] *ERROR* failed to enable link training" href="https://bugs.freedesktop.org/show_bug.cgi?id=109522">bug 109522</a> from <a class="email" href="mailto:howaboutsynergy@pm.me" title="howaboutsynergy@pm.me">howaboutsynergy@pm.me</a> <pre>Created <a href="attachment.cgi?id=144653" name="attach_144653" title="dmesg with drm.debug-0x1e on drm-tip (only within X)">attachment 144653</a> <a href="attachment.cgi?id=144653&action=edit" title="dmesg with drm.debug-0x1e on drm-tip (only within X)">[details]</a> dmesg with drm.debug-0x1e on drm-tip (only within X) Used this drm-tip: commit cc7ffe2a301509ba233652ec17d0f74c18b5c8a9 (HEAD -> drm-tip, origin/drm-tip, origin/HEAD) Date: Thu Jun 27 10:28:10 2019 +0200 drm-tip: 2019y-06m-27d-08h-26m-31s UTC integration manifest Had the following changes in `drivers/gpu/drm/` so that hopefully dumping the stack each time -110 was hit(1+13 times) is helpful to see in the dmesg, however this does increase the time spent(by about 4-5 seconds total), so let me know if you want me to undo this and repost one clean-ish without it. ```patch diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index b9362b4f6353..c5f7f4c37565 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -76,7 +76,7 @@ config DRM_KMS_FB_HELPER bool depends on DRM_KMS_HELPER select FB - select FRAMEBUFFER_CONSOLE if !EXPERT + select FRAMEBUFFER_CONSOLE select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE select FB_SYS_FOPS select FB_SYS_FILLRECT diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 0b994d083a89..92b2199af2ad 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -264,10 +264,12 @@ static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request, err = ret; } - DRM_DEBUG_KMS("Too many retries, giving up. First error: %d\n", err); + DRM_ERROR("Too many retries, giving up. First error: %d\n", err); + dump_stack(); ret = err; unlock: + DRM_ERROR("Ret '%d' after %u retries\n", ret, retry); mutex_unlock(&aux->hw_mutex); return ret; } diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 1984e5c54d58..60004f8ae03a 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -2379,7 +2379,7 @@ EXPORT_SYMBOL(drm_fbdev_generic_setup); */ int __init drm_fb_helper_modinit(void) { -#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT) +#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && ( !defined(CONFIG_EXPERT) || defined(CONFIG_DRM_MODULE) || defined(CONFIG_DRM) ) const char name[] = "fbcon"; struct module *fbcon; diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c index 9b1fccea966b..1242cf9e9828 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -89,6 +89,7 @@ intel_dp_set_link_train(struct intel_dp *intel_dp, ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_PATTERN_SET, buf, len); + DRM_ERROR("ret=%d len=%d\n", ret, len); return ret == len; } ``` For full set of changes(including actual .config file used) see: <a href="https://gist.github.com/howaboutsynergy/9b6e890ec15592a55a0c07b5db234ce6">https://gist.github.com/howaboutsynergy/9b6e890ec15592a55a0c07b5db234ce6</a></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>