Arch Linux

svanberg

Member

Registered: 2009-07-16

Posts: 88

No screen output at console after kernel update [SOLVED]

Hi,

After a recent kernel upgrade I get no console output, but if I blindfully type in my username, password and then execute startx, I get picture on both monitors, connected to a single DisplayPort-cable (MST). I currently use Intel HD Graphics 530 with KMS enabled. I have tried different approaches to disable KMS at boot to get picture at login; nomodeset kernel parameters works, but messes up Xorg instead. I would be happy if someone could help me troubleshooting this, as I don't know what to do next.

Kernel

$ uname -r
4.14.9-1-ARCH

dmesg

$ dmesg | grep drm
[    9.061684] [drm] Memory usable by graphics device = 4096M
[    9.061687] fb: switching to inteldrmfb from EFI VGA
[    9.061760] [drm] Replacing VGA console driver
[    9.116710] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    9.116711] [drm] Driver supports precise vblank timestamp query.
[    9.118296] [drm] Initialized i915 1.6.0 20170818 for 0000:00:02.0 on minor 0
[    9.136745] [drm] Cannot find any crtc or sizes
[    9.200900] [drm] Finished loading DMC firmware i915/skl_dmc_ver1_26.bin (v1.26)
[   10.347471] [drm] RC6 on
[   27.719344] [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.

Last edited by svanberg (2018-09-01 16:30:28)

svanberg

Member

Registered: 2009-07-16

Posts: 88

Re: No screen output at console after kernel update [SOLVED]

Hi again,

I have now gathered more information about the issue! As you can see during the boot sequence, my monitors goes into sleep mode. If I then type in my credentials and then start Xorg, I get picture on both monitors.

https://imgur.com/fkFfWrn

https://imgur.com/a/NExnT

https://imgur.com/kqiWPsM

So I brought my desktop to work today and connected a monitor to the VGA port and it worked!

https://imgur.com/1Vz2Njc

https://imgur.com/Hr85Bk8

As you can see I get different drm entries in dmesg, if you compare the dmesg output in my previous post. I'm starting to believe that this is bug.

svanberg

Member

Registered: 2009-07-16

Posts: 88

Re: No screen output at console after kernel update [SOLVED]

After some time of frustration, I filed a bug report (https://bugs.freedesktop.org/show_bug.cgi?id=105465) and later is was resolved in 4.16.7.