** Description changed:
[SRU Justfication]
- [Impact]
+ TGL platform can't output external monitor on WD19TB docking.
+ There's no screen on the external monitor.
+ error in dmesg:
+
+ [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underru
- [Fix]
+ [Fix]
+ According to Intel's suggestion,
+ we need this: https://patchwork.freedesktop.org/series/78909/
+ Also for dependency, the following patches are landed in drm-tip
+ and necessary for support TGL platform:
+
+ * commit f4ece33f51d8 ("drm/i915/tgl+: Fix TBT DPLL fractional divider for
38.4MHz ref clock")
+ * commit a6e96d6948c8 ("drm/i915/tgl+: Use the correct DP_TP_* register
instances in MST encoders")
+ * commit f822a79734e1 ("drm/i915/dc3co: Avoid full modeset when EXITLINE
needs to be changed")
+ * commit 1a7e82efaa8a ("drm/i915/tgl: Add HBR and HBR2+ voltage swing table")
+ * commit 80907edcc6ed ("UBUNTU: SAUCE: drm/i915/bios: add
intel_bios_hdmi_level_shift()")
+ * commit 6df896896c8d ("drm/i915/tgl: Implement WA_16011163337")
+ * commit cb730fe971f0 ("drm/i915/tgl: Update TC DP vswing table")
- [Test]
-
- [Regression Potential]
+ [Test]
+ The WD19TB can output HDMI/DP to external monitor.
+
+ [Regression Potential]
+ Medium, in order to support TGL platform, we also include two patches:
+ drm/i915/bios: add intel_bios_hdmi_level_shift()
+ drm/i915/dc3co: Avoid full modeset when EXITLINE needs to be changed
+ The two patches are not related to TGL, but for dependency.-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1886165 Title: [WD19TB] external DP failed with DRM error message To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1886165/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
