Arch Linux

TheVulpecula

Member

Registered: 2019-05-22

Posts: 9

Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

Good morning,

I upgraded my system this morning:

sudo pacman -Syu

After rebooting, my laptop screen stays dark but my second and third monitors are fine ( using a dock ).
I powered off the system and tried to boot out of the dock and I can see the BIOS, Grub and even part of GDM with my username shows up and then it goes dark.

I managed to roll back the kernel:

sudo pacman -U /var/cache/pacman/pkg/linux-headers-5.1.16.arch1-1-x86_64.pkg.tar.xz /var/cache/pacman/pkg/linux-5.1.16.arch1-1-x86_64.pkg.tar.xz

Now my laptop screen is again functional.

Any pointers on how to debug this any further?  I tried to see the difference between arch1 and arch2 versions but i'm quite lost on the archlinux git for the kernel. I can't seem to be able to see a diff of both tags?

Thank you.

Last edited by TheVulpecula (2019-07-12 13:33:49)

kryops

Member

Registered: 2019-07-13

Posts: 1

Re: Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

The same happened to me when when upgrading my Dell Latitude E7470 to 5.2-arch2. The internal screen goes black after a few seconds in the GDM login shell (backlight is still on); when connected to the docking station, the external screens work fine. In the Cinnamon desktop screen settings, the internal screen still shows up as active.

For now I downgraded to 5.1.15-arch1, that fixed the issue for me as well. As a temporary workaround, suspending the system and waking it up again using the power button also turned the screen on for up to 1 minute before it turned black once again.

I created a Gist with the `journalctl` output of a boot for both 5.1.15-arch1 and 5.2-arch2: https://gist.github.com/kryops/110fa8c5 … c18d7d666b

konfuzius

Member

Registered: 2016-04-04

Posts: 3

Re: Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

the same here on my thinkpad T460s after upgrading it to  5.2-arch2. After booting the internal screen works until grub. Afterwards it showed the line "starting systemd 242.32-3-arch" and nothing changes. The second and third monitor works as usual.

Downgrading to 5.1.9-arch1 solved the problem.

Sylphid

Member

From: Live Oak TX

Registered: 2011-09-03

Posts: 3

Re: Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

Adding the following option to my kernel boot params worked for me.

i915.enable_psr=0

Looks like there is some awareness to what is going on already here:

https://bugs.archlinux.org/task/63159?project=1

https://bugs.freedesktop.org/show_bug.cgi?id=111088

TheVulpecula

Member

Registered: 2019-05-22

Posts: 9

Re: Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

Adding the following option to my kernel boot params worked for me.

i915.enable_psr=0

Looks like there is some awareness to what is going on already here:

https://bugs.archlinux.org/task/63159?project=1

https://bugs.freedesktop.org/show_bug.cgi?id=111088

That fixed it for me too (until the kernel is patched).

Thanks!

ppb

Member

Registered: 2017-09-25

Posts: 11

Re: Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

[edit] moved here: https://bbs.archlinux.org/viewtopic.php?id=247823

Last edited by ppb (2019-07-18 14:05:26)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 23,231

Re: Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

Please post a new topic, if you have the ability to completely bypass the intel gpu you are bound to have a different cause than what's discussed here. Post a dmesg/journal and xorg log of a faulty boot.

Last edited by V1del (2019-07-16 13:15:10)

Gasp0de

Member

Registered: 2012-12-24

Posts: 47

Re: Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

I am also affected by this. Can someone tell me where I can find out when the patch that has been created is applied to the current arch kernel?

TheVulpecula

Member

Registered: 2019-05-22

Posts: 9

Re: Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

I did a system update today and the i915.enable_psr=0 workaround does not work anymore. I am unaware of any other workaround for now.

Ellgee

Member

Registered: 2019-08-03

Posts: 3

Re: Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

Dell E7470 i5-6200U here on 5.2.5-arch1-1-ARCH with an eDP screen via Intel graphics. Have been having this same issue for about a week, I've just been rolling back to older packages to fix it.  Figured I'd let things settle down for a while to see if this got fixed. Tried an update today and I'm back to the same problem, the screen goes black either towards the end of boot as the boot text is scrolling, or just before LightDM starts. Screen goes totally blank. Switching TTYs works sometimes. Plugging in an external HDMI display works if I change TTY.

Rebooting with

i915.enable_psr=0

brings the screen back up.  Can I provide any useful debugging info so someone can take a look at this?

Gasp0de

Member

Registered: 2012-12-24

Posts: 47

Re: Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

If I understand correctly it has already been fixed but you will have to wait until it is included in the kernel. Someone commented something about linux 5.3 underneath the patch, so I guess we will have to wait until we get 5.3.

TheVulpecula

Member

Registered: 2019-05-22

Posts: 9

Re: Kernel 5.1.16.arch2 breaks laptop screen on Dell Latitude E5470

Hi Gasp0de,

My understanding is that the following needs to be included:

https://patchwork.freedesktop.org/patch … 3774&rev=4

You can follow the thread at the end of the page for all the details, but for now, It seems we have to wait until it reaches the kernel tree.

Dell E7470 i5-6200U here on 5.2.5-arch1-1-ARCH with an eDP screen via Intel graphics. Have been having this same issue for about a week, I've just been rolling back to older packages to fix it.  Figured I'd let things settle down for a while to see if this got fixed. Tried an update today and I'm back to the same problem, the screen goes black either towards the end of boot as the boot text is scrolling, or just before LightDM starts. Screen goes totally blank. Switching TTYs works sometimes. Plugging in an external HDMI display works if I change TTY.

Rebooting with

i915.enable_psr=0

brings the screen back up.  Can I provide any useful debugging info so someone can take a look at this?