** Changed in: linux-oem (Ubuntu Xenial)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1759188
Title:
[8086:3e92] display becomes blank after S3
Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem package in Ubuntu:
In Progress
Status in linux source package in Xenial:
Invalid
Status in linux-oem source package in Xenial:
Fix Committed
Status in linux source package in Artful:
Fix Committed
Status in linux-oem source package in Artful:
Invalid
Status in linux source package in Bionic:
Fix Released
Status in linux-oem source package in Bionic:
In Progress
Bug description:
[Impact]
The display becomes black after S3 with the following error messages.
[ 38.304449] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr:
0050 w(1)
[ 38.304462] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK on first
message, retry
[ 38.306726] [drm:gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr:
0050 w(1)
[ 38.306733] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent
adapter i915 gmbus dpd
[ 38.311251] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode
HDMI ID: DP-HDMI ADAPTOR\004 (err 0)
[ 38.313538] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode
adaptor ID: 44 (err 0)
[ 38.313554] [drm:intel_hdmi_set_edid [i915]] DP dual mode adaptor (type 1
HDMI) detected (max TMDS clock: 165000 kHz)
[ 38.313557] [drm:drm_helper_hpd_irq_event [drm_kms_helper]]
[CONNECTOR:115:HDMI-A-1] status updated from disconnected to disconnected
[Fix]
This commit pointed out by Timo fixes the issue.
[Regression Potential]
Should be low, although the change applies broadly.
From the patch description, it explains it should be safe.
> This workaround was designed to minimize the impact only
> to save the bad case with that link rates. But HW engineers
> indicated that it should be safe to apply broadly, although
> they were expecting the DPLL0 link rate to be unchanged on
> runtime.
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