*** This bug is a duplicate of bug 1821820 ***
https://bugs.launchpad.net/bugs/1821820
Here are the relevant portions of my dmesg with drm.debug=14 as a boot
paramater. You can see my laptops display panel is still failing link
training.
21:00:11 kernel: [drm:intel_dp_get_link_train_fallback_values [i915]] Retrying
Link training for eDP with same parameters
21:00:11 kernel: [drm:intel_dp_start_link_train [i915]] [CONNECTOR:85:eDP-1]
Link Training failed at link rate = 324000, lane count = 1
21:00:11 kernel: [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis
level 0
21:00:11 kernel: [drm:intel_dp_program_link_training_pattern [i915]] Using DP
training pattern TPS1
21:00:11 kernel: [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis
level 0
21:00:11 kernel: [drm:intel_dp_start_link_train [i915]] Using LINK_RATE_SET
value 04
** Attachment added: "dmesg with drm.debug=14"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824216/+attachment/5255576/+files/log%20messages
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https://bugs.launchpad.net/bugs/1824216
Title:
Linux 5.0 regression i915 module, black screen on boot for certain
laptop panels
Status in linux package in Ubuntu:
Confirmed
Bug description:
On my Dell XPS 9575, I get a black screen on boot when running the
19.04 live image, OR after updating from 18.10 to 19.04. It appears
to be a kernel related bug that was introduced in 5.0 that is affected
by certain laptop panels not conforming to their stated
specifications.
Several other Dell systems exhibit the same issue, and it's very
possible that there are other panels used on other systems that will
also have the same issues.
Intel is aware of this issue and has already created a patch. You can
see the relevant threads here:
https://bugs.freedesktop.org/show_bug.cgi?id=109959
And the patch here:
https://patchwork.freedesktop.org/patch/296411/
It would be fantastic to get this patch applied before release, as it
would be very difficult install 19.04 on the affected systems
otherwise. I was able to get the live image booted by adding the
nomodeset kernel parameter to grub, so as a work around you can use
this approach to install.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824216/+subscriptions
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