Re: Laptop LVDS display blank after suspend and resume

[Sandeep <sandy.8925@xxxxxxxxx>]

Note:

The system does not hang. I can ssh into the system and execute commands successfully.

Also, external displays work fine. I have currently attached the laptop to a HDMI display, and the laptop continues to send video output to the HDMI display. So, I can continue to use it that way. It is only the LVDS panel that does not display anything.

Here are the steps I have taken to try and fix the problem so far:

Tried troubleshooting steps here: https://wiki.archlinux.org/index.php/Backlight  to no avail.

acpi_osi kernel parameter - BIOS may query the OS to find out which OS it is (Windows, Linux, etc.) and appropriately disable/enable certain features to ensure compatibility. When BIOS asks Linux if it is a Linux system, by default Linux ignores the query (so that all features are exposed). acpi_osi allows users to override that behaviour. The value for acpi_osi will be given to the BIOS by Linux when BIOS queries the OS.

Tried following kernel parameters:

video.use_native_nacklight=1

acpi_osi=Linux acpi_backlight=vendor

acpi_backlight=legacy

systemd.restore_state=0

acpi_osi=Linux

acpi_osi=Windows

Did not affect outcome.

Tried using pm-suspend with following quirks:

quirk-radeon-off

quirk-dpms-on

quirk-s3-bios

quirk-vbe-post

quirk-dpms-suspend

quirk-s3-mode

Did not affect outcome.

Stored following code in /etc/pm/sleep.d/00displaywakeup :

#!/bin/sh

#

case "$1" in

   suspend)

   ;;

   resume)

       sleep 5

       vbetool dpms off

       vbetool dpms on

   ;;

   *) exit $NA

   ;;

esac

Did not affect outcome.

Executed: radeontool light on

Did not affect outcome.

- Sandeep

On Thu, Mar 27, 2014 at 8:34 PM, Sandeep <sandy.8925@xxxxxxxxx> wrote:

I am currently facing a problem on my laptop (an ASUS K53TA). The LVDS display is blank (no backlight) after suspending and resuming.

On Windows, using AMD's Catalyst driver the display is still active after suspend and resume, so the problem occurs only in Linux.

I am running Arch Linux 64 bit , with Linux kernel 3.13.6. I have filed a bug report already: https://bugs.freedesktop.org/show_bug.cgi?id=42960

I have faced this problem since Linux kernel 3.2 , so as far as I know it is not a regression. 

I had used AMD's Catalyst drivers for some time, and the same problem had occurred with those drivers as well, but the problem was fixed in later versions of the Catalyst driver.

I want to figure out why this problem occurs and find a permanent fix. 

Could someone please tell me if the GPU driver is the only code responsible for bringing up the display, or are other parts of the kernel involved as well? How would I begin to debug this issue?

Thanks in advance,

Sandeep

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