** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1764194
Title:
Dell Latitude 5490/5590 BIOS update 1.1.9 causes black screen at boot
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Artful:
In Progress
Status in linux source package in Bionic:
Fix Committed
Bug description:
== SRU Justification ==
This bug causes a Dell Latitude 5490/5590 with BIOS update 1.1.9 to get a
black screen at boot. Specifying 'nomodeset' on the kernel command line works
around the problem.
Intel resolved the problem in upstream commit a3520b8992e5. This commit
is now in mainline as of 4.17.rc2. It has also been cc'd to upstream
stable.
== Fix ==
a3520b8992e5 ("drm/i915/bios: filter out invalid DDC pins from VBT child
devices")
== Regression Potential ==
Low. This commit was also cc'd to upstream stable, so it recieved
additional upstream review.
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Ubuntu 16.04.4 LTS was installed to some Dell Latitude 5490 & 5590
laptops, originally running BIOS version 1.0.8. The install media and
the installed OS was running linux-generic-hwe kernel 4.13.0.
After upgrading BIOS to latest version 1.1.9, the kernel no longer
boots: right after loading the i915 drm driver, the screen goes black,
and the machine can only be reset or power cycled. This is true for
both the installation media, and the OS instance previously installed
to the disk and updated to the latest hwe kernel 4.13.0-38.
Specifying 'nomodeset' on the kernel command line works around the
problem by disabling the i915 drm driver functionality. In that case,
several display driver function are obviously missing (eg GLX &
xrandr).
The problem manifested itself even when using the drm upstream latest
git-head version. A custom built kernel was used to provide logs for this
upstream bug report:
https://bugs.freedesktop.org/show_bug.cgi?id=105549
The upstream Intel developers provided a patch, which was successfully tested
by both the original reporter and me.
https://patchwork.freedesktop.org/patch/216371/
https://github.com/freedesktop/drm-tip/commit/f212bf9abe5de9f938fecea7df07046e74052dde
I backported this fix to ubuntu-xenial hwe git-head, and tested the
result successfully. I'd like this fix to be added to the ubuntu-
xenial linux-generic-hwe kernel.
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