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

[André Silva]

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On 09/12/2014 10:13 AM, Michał Masłowski wrote:
>> I use de KMS start later and I edit boot options in
>> /etc/default/grub GRUB_GFXMODE=1024x768x31
>> 
>> Now the radeon works without nomodeset in boot options
> 
> It doesn't.  The radeon X driver fails since KMS is disabled
> (why?)

Jorginho is using Late start mode [0]. KMS is enabled by default for
autodetected AMD/ATI cards.[1]
If an user wants to disable KMS, needs add nomodeset as a kernel
parameter.[2]
Otherwise, as of Linux-libre 3.9, CONFIG_DRM_RADEON includes KMS
support by default, so i've removed CONFIG_DRM_RADEON_KMS from our
config files because it doesn't exists anymore.[3]

[0]:https://wiki.archlinux.org/index.php/ATI#Late_start
[1]:https://wiki.archlinux.org/index.php/ATI#Kernel_mode-setting_.28KMS.29
[2]:https://wiki.archlinux.org/index.php/Kernel_Mode_Setting#Disabling_modesetting
[3]:https://lukeshu.com/git/mirror/parabola/abslibre.git/commit/?id=c97f8be3b90679d7a8758e076b07b906cc5715e6

> X uses the vesa driver which chooses 1024x768.  It's not a
> solution for users of wide LCD screens.

I think he should test with a LCD resolution to check it. In this
case, if he's using vesa, it shouldn't works. Otherwise he told to me
that he is using a custom config file of xorg to use radeon driver,
but i think he should send to us the xorg config and log files to
confirm if he is using radeon driver instead of vesa
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