[SOLVED] i915 screen turns off after boot

loserMcloser · 2016-04-07 15:43:22

Thought I would post this to help anyone with the same issue.

PROBLEM: After upgrading the kernel from 4.3 to 4.4, the monitor would go into power-saving mode immediately after the i915 module was loaded from the initramfs.

REASON: The monitor was no longer being detected by the card. After booting to the archfallback initramfs with i915.modeset=0 to get a working text display, found:

$ journalctl | grep i915
...
kernel: i915 0000:00:02.0: No connectors reported connected with modes
...

SOLUTION: With help from the wiki:

Temporarily downgraded the kernel back to the most recent working 4.3 version.

Found the usual connector for card:

$ for p in /sys/class/drm/*/status; do con=${p%/status}; echo -n "${con#*/card?-}: "; cat $p; done
DP-1: disconnected
HDMI-A-1: connected
VGA-1: disconnected

Chose the desired resolution and refresh rate:

$ xrandr
...
HDMI1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 290mm
   1920x1080     60.00*+
...

Added the following parameter to the kernel APPEND line:
```
video=HDMI-A-1:1920x1080@60D
```
(The suffix D tells it to force the digital output on, not sure if this was needed or not, but it works for me so I'm leaving it.)
Upgraded the kernel back up to the current package, crossed fingers, rebooted, success!

Cheers!

archwu · 2016-04-26 20:27:49

Thanks a lot! Although I am using Ubuntu 16.04 I was so glad to find a solution here! Didn't even think about the possibility that simply the card didn't detect my monitor.

sulaweyo · 2016-10-22 09:51:22

Thank you loserMcloser!
I had this problem for some time but never bothered to fix it as i ssh into that box usually. Started to become a real problem when i locked me out via a firewall rule. Finally fixed it now.
Thx

schneida · 2017-06-10 14:33:53

Archlinux Forum is the best! @loserMcloser your solution worked perfectly for Openelec to force enabling the HDMI output even if no display is connected. Now I'm able to startup Kodi/Openelec without the TV turned on and can still listen to music via the audio receiver!

WorMzy · 2017-06-10 15:21:22

Schneida, you should know better than to necrobump.

https://wiki.archlinux.org/index.php/Co … bumping.22

Closing.

Arch Linux

#1 2016-04-07 15:43:22

[SOLVED] i915 screen turns off after boot

#2 2016-04-26 20:27:49

Re: [SOLVED] i915 screen turns off after boot

#3 2016-10-22 09:51:22

Re: [SOLVED] i915 screen turns off after boot

#4 2017-06-10 14:33:53

Re: [SOLVED] i915 screen turns off after boot

#5 2017-06-10 15:21:22

Re: [SOLVED] i915 screen turns off after boot

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