Arch Linux

Logicien

Member

Registered: 2010-07-31

Posts: 10

Video support in UEFI mode

Hello,

I recently switch to EFI boot interface with a GPT partitions table disk with ArchLinux. The efifb work correctly and is remplace by the radeondrmfb. Both work well. My problem is that I cannot use vesafb in EFI mode. Even with

radeon.modeset=0 video=vesafb

kernel parameters, it is always the efifb framebuffer who is in use. I try to set grub-efi-x86_64

set gfxmode=1366x768-32
set gfxpayload=keep

but the vesafb is nerver in use.

So, is the efifb the only available framebuffer in plus of Radeon KMS (I have an Ati card) in EFI mode? It look like if the vesafb is only for BIOS boot sheme.

The fglrx kernel module load, but the proprietary Ati Xorg driver fglrx do not work. It complain about a missing Section "Devices" in xorg.conf. With the xorg.conf

aticonfig --initial

configuration file, it do not work too. Radeon KMS is disabled and efifb is on. Nothing have been add or substract form the /etc/X11/xorg.conf.d/ directory.

Gusar

Member

Registered: 2009-08-25

Posts: 3,607

Re: Video support in UEFI mode

"Does not work" is not a useful bug report. We need exact error messages, /var/log/Xorg.0.log is the usual place to get them.

PS. There's indeed no vesa with EFI, there's efifb instead. Could be fglrx doesn't work on EFI. For example, the nvidia driver officially doesn't (unofficially, there's reports of it working).

Logicien

Member

Registered: 2010-07-31

Posts: 10

Re: Video support in UEFI mode

Unfortunately, I did not save the Xorg.0.log of fglrx. So I only wrote what I remember because I had to reinstall the xf86-video-ati drivers to have X working.

I have only one problem with Radeon/KMS/Xorg drivers in EFI and BIOS modes. When I go in full screen mode (Ctrl_Alt+f) with qemu(-kvm), I get a white/black screen flicking. I have to Control-Backspace-Delete and go back to console. Any modification to xorg.conf, drirc or anything fail. Without Xorg Radeon 3D acceleration or with Xorg fbdev driver, there is no problem. My Amd/Ati card is

00:01.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Trinity [Radeon HD 7520G]

The radeon kernel module use the ARUBA firmware.

The proprietary Ati drivers where working with Gentoo in BIOS mode on this laptop. It's the first and only time I try the proprietary Ati drivers with ArchLinux on this laptop. I am gone stay with the free drivers that I prefer anyway. Any hint is wellcome.

Thank-you for your help.

Last edited by Logicien (2013-01-07 01:03:25)