Bug 6951

Summary:	dkms built fglrx disabled 3rd monitor on triple head 6870 system, works w/std kernel/driver
Product:	Mageia	Reporter:	Greg McGee <gjmcgee>
Component:	RPM Packages	Assignee:	Mageia Bug Squad <bugsquad>
Status:	RESOLVED WONTFIX	QA Contact:
Severity:	normal
Priority:	Normal
Version:	2
Target Milestone:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Source RPM:	dkms-fglrx-8.961-1.mga2.nonfree	CVE:
Status comment:

Description Greg McGee 2012-08-04 18:14:07 CEST

Description of problem:
dkms built fglrx on recompiled custom kernel (only turned off tickless and set for low latency desktop) disabled 3rd monitor on triple head 6870/2G and AMD 785-based quad core system, works perfectly w/std kernel/driver

(just boots at incredibly slow rate for unknown reasons with std kernel, but I digress, did a fresh install from release, mistake, was running from beta2 DVD install, worked better)

Only posting a bug as it's a head scratcher.

Version-Release number of selected component (if applicable):
dkms-fglrx-8.961-1.mga2.nonfree
kernel-3.3.6-2.mga2â


How reproducible: Boot custom kernel with dkms built fglrx, tickless set off and low latency desktop set.

I'm going to rebuild with std options and see if it's the LL desktop or tickless options causing the issue for some bizarre reason, mainly posting bug to document the issue.

Comment 1 Greg McGee 2012-08-05 13:39:40 CEST

Duplicated after building more variations of the std kernel than I'd like to admit, disabling ONLY "tickless kernel" as an option (all else being std, same xorg.conf and all other kernel options) also disables the third monitor functionalityfor some unknown reason. 

As it really hurts nothing to leave "tickless enabled (as it must be explicitly turned on in the kernel command line ala "nohz=1" or such...) ...the moral of the story is "don't do that"

The low latency etc made no difference.

This likely only matters to the three people running a triple-headed AMD//ATI card configs with fglrx.

Closed and documented for posterity?

Status: NEW => RESOLVED
Resolution: (none) => WONTFIX