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Return from suspend/hibernate always shows dark screen

asked 2014-03-22 05:08:16 -0600

alfC gravatar image

updated 2014-03-22 13:47:46 -0600

mether gravatar image

I have a Dell Inspiron 17r and Fedora 20 and each time I return from suspend the screen is completely dark. Luckly I realized that the problem was that the brighness go to zero (before I was resetting), so now I just increase the brightness.

Is is possible to change this behavior? That is to avoid the screen to set its brighness to zero upon suspend.

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answered 2014-03-25 16:41:19 -0600

updated 2014-04-17 09:46:24 -0600

You may want to try loading your kernel with the argument: "acpi_backlight=vendor"

To accomplish this, open /etc/default/grub with whatever text editor suits you and add "acpi_backlight=vendor" to the list of kernel arguments stored in the variable "GRUB_CMDLINE_LINUX". You'll see a line that reads something like:

GRUB_CMDLINE_LINUX="rhgb quiet"

This variable stores command line arguments to be passed to the Linux kernel by GRUB when it is booted. Just append acpi_backlight=vendor to the text so that it reads something like:

GRUB_CMDLINE_LINUX="rhgb quiet acpi_backlight=vendor"

After you do that, save the file and run the following command to rebuild the GRUB config file:

grub2-mkconfig -o /boot/grub2/grub.cfg [or typically /boot/efi/EFI/grub/grub.cfg for UEFI systems]

Then, reboot your system. See if the problem persists and let me know.

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Ok, now I have this GRUB_CMDLINE_LINUX="vconsole.font=latarcyrheb-sun16 $([ -x /usr/sbin/rhcrashkernel-param ] && /usr/sbin/rhcrashkernel-param || :) rhgb quiet acpi_backlight=vendor". Let's see what happens.

alfC gravatar imagealfC ( 2014-03-28 17:43:54 -0600 )edit

Ok, the problem is that this solution, leaves with no brightness control at all. (brightness indicator changes but actual brightness doesn't).

alfC gravatar imagealfC ( 2014-03-30 21:38:30 -0600 )edit

Does it at least prevent the system from returning from suspension with a darkened display?

bitwiseoperator gravatar imagebitwiseoperator ( 2014-03-31 13:36:25 -0600 )edit

grub.cfg has a different path on UEFI systems - can you update your answer please?

randomuser gravatar imagerandomuser ( 2014-04-16 23:58:29 -0600 )edit

Thanks for the review - let me know if my update is incomplete or incorrect (I'm not near my UEFI machine at the moment so I can't double-check, though I believe I am correct).

bitwiseoperator gravatar imagebitwiseoperator ( 2014-04-17 09:47:25 -0600 )edit

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Asked: 2014-03-22 05:08:16 -0600

Seen: 1,209 times

Last updated: Apr 17 '14