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