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#1 2019-05-16 23:22:23

rcorre
Member
Registered: 2015-11-27
Posts: 65

Gray, glitchy display

Excuse the brevity, I'm travelling and my only device (other than my phone) is now broken.

I've got an old-ish surface pro. Intel graphics using KMS. After a system update, the display is gray and "vibrates". It is fine when I input my decryption password, and I can see some boot lines fly by. Then the screen goes black, and when it comes back, it is glitchy.

I can adjust my kernel boot line and run commands blind, but can't read any output. I've tried installing various drivers and rebooting (xf86-video-{intel,vesa,fbdev}). "nomodeset" hangs the boot. Switching to a non-X TTY does not help.

I've no bootable media. Any advice is appreciated, even if just a clever trick to run commands and see output with a borked display.

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#2 2019-05-17 06:30:59

seth
Member
Registered: 2012-09-03
Posts: 50,012

Re: Gray, glitchy display

pic or didn't happen (you've a phone, you've a cma ;-)

nomodeset will break graphical targets, but you can still boot the multi-user.target, https://wiki.archlinux.org/index.php/Sy … _boot_into

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#3 2019-05-17 12:14:45

rcorre
Member
Registered: 2015-11-27
Posts: 65

Re: Gray, glitchy display

Ye of little faith. Here's a video:

https://photos.app.goo.gl/64prNks8PKN53ovd9

Thanks for the tip though. With `systemd.unit=mutli-user.target nomodeset` I get a readable TTY.

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#4 2019-05-17 12:23:32

rcorre
Member
Registered: 2015-11-27
Posts: 65

Re: Gray, glitchy display

With that, I was able to roll back the kernel (5.1.2.arch1-1->5.0.13.arch1-1) and the display is working again.
I suppose I'll mark this solved, but I'll post back if I figure out anything more about why it broke.
Thanks again!

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#5 2019-05-17 12:32:40

seth
Member
Registered: 2012-09-03
Posts: 50,012

Re: Gray, glitchy display

Looks like a frequency issue, maybe power saving?
https://wiki.archlinux.org/index.php/In … flickering

Is the text of a different resolution between kernel versions?

You can also install the LTS kernel and keep the main kernel "broken" for further investigations.

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#6 2019-05-17 12:34:58

rcorre
Member
Registered: 2015-11-27
Posts: 65

Re: Gray, glitchy display

I tried `i915.enable_psr=0`, but no luck. It is hard to tell if it is a different resolution, as it is barely readable at all. It doesn't seem noticeably smaller/larger though.

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#7 2019-05-17 12:40:03

seth
Member
Registered: 2012-09-03
Posts: 50,012

Re: Gray, glitchy display

The resolution would directly translate to the font size.

More power saving stuff:

i915.enable_dc=0 i915.enable_fb=0 i915.enable_ips=0

As well as

i915.disable_power_well=0|1

(the default is -1, "auto" and I've no idea whether this could impact the behavior in either direction)

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#8 2019-05-17 19:03:42

rcorre
Member
Registered: 2015-11-27
Posts: 65

Re: Gray, glitchy display

Tried all of those parameters (both 0 and 1 for power_well) and nothing helped.

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