Arch Linux

ksu

Member

Registered: 2015-02-26

Posts: 55

[SOLVED] Blank screen (frequency out of range) with kernel 4.0

I've just updated to kernel 4.0 but I get a blank screen, my monitors displays "frequency out of range". Must be a GPU driver issue I guess.
I have a Radeon HD5850, using the xf86-video-ati drivers.

I have additionally these kernels installed, with them I can boot without problems: 3.19.5, 3.19.5-ck, 4.0-ck

Here is the output of journalctl: http://pastebin.com/h08JMY10

When I boot with nomodeset, my monitor doesn't go blank and this is the last kernel message I see, nothing more will happen: "[drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module!"

Here is the journalctl of the nodemodeset boot: http://pastebin.com/Nc9bvqmV

I'd appreciate any help!

Last edited by ksu (2015-05-01 00:07:45)

Roysten

Member

Registered: 2014-10-30

Posts: 14

Re: [SOLVED] Blank screen (frequency out of range) with kernel 4.0

The open source Radeon drivers require modesetting to be enabled, so unless you have the fallback VESA drivers installed adding nomodeset will never work Does the tty has the correct resolution when using modesetting?

ksu

Member

Registered: 2015-02-26

Posts: 55

Re: [SOLVED] Blank screen (frequency out of range) with kernel 4.0

Ah, understood, so if I want to boot with nomodeset I have to install the xf86-video-vesa driver as a fallback? And what exactly do you mean by "using modesetting"? You mean by booting without "nomodeset" I guess?

If I boot with using modesetting (if I understood you correctly) then my screen turns blank as I described. I can switch to another tty with ctrl+alt+f2, but my display stays blank. From there I can at least blindly log in and reboot.

Edit: I should add that I use sddm and KDE 5

Last edited by ksu (2015-04-30 19:59:58)

ksu

Member

Registered: 2015-02-26

Posts: 55

Re: [SOLVED] Blank screen (frequency out of range) with kernel 4.0

I installed the vesa driver and could then boot to my desktop with nomodeset. But I have no idea why it doesn't work otherwise by looking through the journal. I'd really appreciate if someone with more experience in this regard could take a look in the journal, thanks

ksu

Member

Registered: 2015-02-26

Posts: 55

Re: [SOLVED] Blank screen (frequency out of range) with kernel 4.0

Alright, I got it sorted out. I had to put "set gfxpayload=keep" in my /etc/grub.d/40_custom (I'm still using kubuntu to manage my grub, so can't use /etc/default/grub in this case). Don't know why this is suddenly necessary with kernel 4.0.