** Also affects: linux-oem (Ubuntu)
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
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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