Sorry about not finishing the bisection. I was dubious about the prospect of finding a nice clean patch to cherry pick in that drm-intel branch. But this is superseded now by the upgrade of linux-generic- hwe-16.04 to 4.15, which does not have the same issue.
I recommend closing this bug as fixed, and discussing the unrelated blank screen issues elsewhere. A blank screen is a failure mode, not a specific bug. Anyone seeing a blank screen in 4.14 or later is not experiencing the same issue. This was an i915 bug in the 4.13 kernel. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1742602 Title: Blank screen when starting X after upgrading from 4.10 to 4.13.0-26 Status in linux package in Ubuntu: Incomplete Status in linux source package in Artful: Incomplete Bug description: 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). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1742602/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
