[Assist] [Dev] Fwd: Re: Xorg Problem with Radeon

[André Silva]

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On 09/12/2014 07:35 AM, Jorge Lopez wrote:
> I don't need AGP support because my card is PCI-E.
> 
So, i think you have have problems with the resolution. If you are
doing early KMS, you must construct your own EDID or you will run into
problems.
The makefile included in the Documentation/EDID sources of the kernel. [0]
It says "The code (see drivers/gpu/drm/drm_edid_load.c) contains
built-in data sets for commonly used screen resolutions (800x600,
1024x768, 1280x1024, 1600x1200, 1680x1050, 1920x1080) as binary blobs,
but the kernel source tree does not contain code to create these
data.", therefore it is nonfree! It should be reported to Linux-libre
developers :S
So, in my opinion you should follow the Late start mode [1] and pay
attention on the first part that says
"Remove all vga= options from the kernel line in the bootloader
configuration file. Using other framebuffer drivers (such as uvesafb
or radeonfb) will conflict with KMS. Remove any framebuffer related
modules from /etc/mkinitcpio.conf. video= can now be used in
conjunction with KMS."
There is a part that says "video= can now be used in conjunction with
KMS", if the problem persists specifying resolution with video=
command line may be useful. A mode can be forced on the kernel command
line, but the command line option video is poorly documented in the
DRM case. Bits and pieces on how to use it can be found in [2][3] or
if you are using GRUB, check [4]

[0]:https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/Documentation/EDID/HOWTO.txt
[1]:https://wiki.archlinux.org/index.php/ATI#Late_start
[2]:http://cgit.freedesktop.org/nouveau/linux-2.6/tree/Documentation/fb/modedb.txt
[3]:http://cgit.freedesktop.org/nouveau/linux-2.6/tree/drivers/gpu/drm/drm_fb_helper.c
[4]:https://wiki.archlinux.org/index.php/GRUB#Setting_the_framebuffer_resolution
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