How to over-ride the autoconfigured Device-section?

Harald Hannelius harald at
Tue Feb 5 23:47:50 PST 2013

On Tue, 5 Feb 2013, Felix Miata wrote:
> On 2013-02-05 15:15 (GMT+0200) Harald Hannelius composed:
>> I'd like to try out a few options for the radeon-driver, but I can't for my
>> life figure out why my custom conf-file in /usr/share/X11/xorg.conf.d is
>> ignored.
>> The file looks like this;
>> # cat 53-radeon.conf
>> Section "Device"
>>   	Driver	"radeon"
>>   	#Identifier "Device0"
>>   	#Identifier "Configured Video Device"
>>   	#Identifier "Default Device"
>>   	Identifier "ATI Radeon HD 5570"
>>   	#Identifier "RADEON(0)"
>>   	BusID "PCI:0:1:0:0"
>>   	#ChipID 0x68d9
>>   	#disable
>>   	Option "SwapbuffersWait" "off"
>>   	# enable
>>   	Option "ColorTiling"  "on"
>>   	# enable
>>   	Option "ColorTiling2D" "on"
>> EndSection
>> I seem to be unable to guess at what I should put in the Identifier line so
>> these changes get applied. The files gets read, a typo in it will make the
>> x-server unstartable.
> It may depend on customizations of the distro you use, but I have found that 
> any changes you wish to make to video via xorg.conf.d/ require you connect 
> device, monitor and screen via their identifiers. Look at 
> and/or 
> to see what I mean.

That's what I was suspecting as well. This makes it a little tougher since 
I have double monitors and after moving over to using xrandr this got a 
lot easier to configure than before.

I have a couple of generations of xorg.confs to cheat from though.

Life is a lot easier than in -95, at least modelines work out of the box 
these days.

> Also remember when troubleshooting X video that /var/log/Xorg.#.log is your 
> friend. It's probably telling you what's wrong.

It does :)

[    16.873] (II) RADEON(0): SwapBuffers wait for vsync: enabled

What the log doesn't tell me however, is the Identifier for the 
graphics-card. Or I'm unable to read it from the log.

There isn't any way to dictate options for the radeon driver, without 
having to handcode sections for monitors and screens as well?

A: Top Posters!                                      |  s/y Charlotta |
Q: What is the most annoying thing on mailing lists? |    FIN-2674    | Finn Express Purjehtijat ry   |  ============= |
Harald H Hannelius | harald (At) iki (dot) fi | GSM +358 50 594 1020

More information about the xorg mailing list