FS#57653 - [linux] External monitor (docking station) fails to work with linux-4.15+ on Lenovo T470s
Attached to Project:
Arch Linux
Opened by Paul Moore (pcmoore) - Monday, 26 February 2018, 19:58 GMT
Last edited by Doug Newgard (Scimmia) - Friday, 20 April 2018, 15:34 GMT
Opened by Paul Moore (pcmoore) - Monday, 26 February 2018, 19:58 GMT
Last edited by Doug Newgard (Scimmia) - Friday, 20 April 2018, 15:34 GMT
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Details
Description:
Starting with the Linux v4.15 packages (just verified with linux-4.15.5-1) my external monitor, connected via a docking station does not work (it goes into power save mode). The monitor works without problem on earlier kernels, including linux-4.14.15-1 (currently running kernel). It all happens very quickly during boot, but it would appear that there is some initial text displayed during early boot, but the monitor is blank by the time that initramfs asks for a password (dm-crypt'd root partition). Additional info: * hardware information Lenovo T470s Intel Corporation HD Graphics 620 Standard Lenovo docking station, display connected via DisplayPort * package version(s) linux 4.15.5-1 mkinitcpio 24-2 * config and/or log files etc. # cat /proc/cmdline BOOT_IMAGE=/vmlinuz-linux root=UUID=XXX rw cryptdevice=UUID=XXX:cryptoroot:allow-discards # cat /etc/mkinitcpio.conf | grep -v "^#" | grep -v "^$" MODULES=(i915) BINARIES=() FILES=() HOOKS=(base keyboard udev autodetect modconf encrypt block filesystems fsck) Steps to reproduce: Install linux-4.15+, reboot. |
This task depends upon
Closed by Doug Newgard (Scimmia)
Friday, 20 April 2018, 15:34 GMT
Reason for closing: Fixed
Additional comments about closing: linux 4.16.2-2
Friday, 20 April 2018, 15:34 GMT
Reason for closing: Fixed
Additional comments about closing: linux 4.16.2-2
I looked at the Fedora bug report from @poinu and it appears to be a similar problem, although I don't have a quick way to tell if the system fully boots while docked (laptop screen is not visible). The system does boot, and appears to work correctly, using a v4.15.x kernel if *undocked*.
Does anyone have an Arch kernel with the patch from the Fedora BZ? If so, I would be willing to test it ...