group.of.nepali.translators team mailing list archive

[Timo Aaltonen <tjaalton@xxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-oem (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1738523

Title:
  External HDMI monitor failed to show screen on Lenovo X1 series

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Fix Committed
Status in linux-oem package in Ubuntu:
  New
Status in linux source package in Xenial:
  New
Status in linux-oem source package in Xenial:
  Fix Committed

Bug description:
  Thinkpad X1 yoga:
  CPU: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz (family: 0x6, model: 0x8e, stepping: 0xa)
  GPU: Intel Corporation Device [8086:5917] (rev 07) (prog-if 00 [VGA controller])

  Steps:
  1, Connect an external monitor
  2, Try to switch display modes in mirrored, extended, displayed on external or internal.

  [Impact]
  External HDMI monitor failed to show screen on Lenovo X1 yoga/carbon

  [Fix]
  Add a workaround to bypass this TMDS_OE writing on identified laptop models.

  [Test Case]
  Tested on ThinkPad X1 yoga 2nd/3rd and Carbon 6th, external HDMI output
  OK.

  [Regression Potential]
  Low, it limits to ThinkPad specific laptops.

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