Arch Linux

otti

Member

Registered: 2006-12-18

Posts: 64

Disabling KMS results in error when starting xorg

Hi,

after the latest kernel update I recognized a poor performance when watching flash videos in fullscreen resolution.
Thats possible due to the default enabled KMS. Hence I wanted to disable KMS via "nomodeset" or "radeon.modeset=0".
But now the start of xorg fails with following error:

Fatal server error:
Couldn't find valid PLL dividers

Here is the complete output:

X.Org X Server 1.7.6
Release Date: 2010-03-17
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.33-ARCH i686 
Current Operating System: Linux narf 2.6.33-ARCH #1 SMP PREEMPT Mon Apr 5 05:57:38 UTC 2010 i686
Kernel command line: root=/dev/disk/by-uuid/1d71daa1-4682-4a2c-bf1d-a28f2580e112 ro nomodeset
Build Date: 01 April 2010  05:35:33PM
 
Current version of pixman: 0.18.0
    Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Sun Apr 11 21:03:24 2010
(==) Using default built-in configuration (30 lines)
(EE) Failed to load module "vesa" (module does not exist, 0)
(EE) Failed to load module "fbdev" (module does not exist, 0)
(II) [KMS] drm report modesetting isn't supported.
  XRANDR name: VGA-0
  Connector: VGA
  CRT1: INTERNAL_DAC1
  DDC reg: 0x64
  XRANDR name: DVI-0
  Connector: DVI-I
  CRT2: INTERNAL_DAC2
  DFP1: INTERNAL_TMDS1
  DDC reg: 0x68
Dac detection success
finished output detect: 0
finished output detect: 1
finished all detect
Dac detection success
Entering TV Save
Save TV timing tables
saveTimingTables: reading timing tables
TV Save done
disable FP1
disable primary dac
disable FP1
disable FP1
init memmap
init common
init crtc1
init pll1
freq: 146250000
best_freq: 4294967295
best_feedback_div: 1
best_frac_feedback_div: 0
best_ref_div: 1
best_post_div: 1

Fatal server error:
Couldn't find valid PLL dividers


Please consult the The X.Org Foundation support 
     at http://wiki.x.org
 for help. 
Please also check the log file at "/var/log/Xorg.0.log" for additional information.

disable FP1
finished PLL2
finished PLL1
Entering Restore TV
Restore TV PLL
Restore TVHV
Restore TV Restarts
Restore Timing Tables
Restore TV standard
Leaving Restore TV
giving up.
xinit:  No such file or directory (errno 2):  unable to connect to X server
xinit:  No such process (errno 3):  Server error.

I'm using a Radeon X850Pro (ATI R480) and the xf86-video-ati driver.

Does anybody know how to get xorg working with disabled KMS?

geniuz

Member

Registered: 2010-04-10

Posts: 127

Re: Disabling KMS results in error when starting xorg

Hi, I had the same issue..the way I see it the current situation allows for X to work only when KMS is enabled. It is all explained in the following thread (be it for Intel drivers):

http://bbs.archlinux.org/viewtopic.php? … 80#p742480

Since I've just done a clean install on my MacBook I did not yet have time to asses the performance as such. If you really want your old situation back you could always downgrade your kernel.

Last edited by geniuz (2010-04-12 23:52:07)

otti

Member

Registered: 2006-12-18

Posts: 64

Re: Disabling KMS results in error when starting xorg

I tried to downgrade the kernel (from 2.6.33 to 2.6.32) with the result that I got the same error as before.
Then I had the idea to downgrade the package xf86-video-ati (from 6.12.192-1 to 6.12.4-3). Afterwards I could start xorg again,
even with the newest kernel (the option "nodmodeset" worked).

So it seems that there is something wrong in the new version of xf86-video-ati.