Public bug reported:
I'm following the HWE kernels in Ubuntu 16.04, so my kernel was upgraded
today from 4.10.0-42 to 4.13.0-26. After rebooting, the splash screen
and disk encryption passphrase prompt showed correctly, but when X
started, the screen went blank. Logs showed everything running as normal
despite the blank screen. Rebooting with the "nomodeset" kernel
parameter fixed the issue but is not suitable as a permanent workaround
since it disables my external monitor. Rebooting back into 4.10 also
fixed the issue.
I am using a ThinkPad X240 laptop, current HWE X.org packages. I tried
both intel and fbdev X drivers, both gave a blank screen.
lsb_release: Ubuntu 16.04.3 LTS
dpkg-query -W:
linux-signed-image-generic-hwe-16.04 4.13.0.26.46
xserver-xorg-hwe-16.04 1:7.7+16ubuntu3~16.04.1
xserver-xorg-video-intel-hwe-16.04 2:2.99.917+git20170309-0ubuntu1~16.04.1
xserver-xorg-video-fbdev-hwe-16.04 1:0.4.4-1build6~16.04.1
In Xorg.0.log with fbdev, I saw:
[ 23.646] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
repeated 239 times.
Typical kernel messages attached (from kern.log, reformatted to look
like dmesg).
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "dmesg"
https://bugs.launchpad.net/bugs/1742602/+attachment/5034871/+files/dmesg
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https://bugs.launchpad.net/bugs/1742602
Title:
Blank screen when starting X after upgrading from 4.10 to 4.13.0-26
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