Regression in intel driver

[Paul B. Mahol]

On 9/23/08, Tom Evans <tevans.uk at googlemail.com> wrote:
> On Tue, 2008-09-23 at 10:30 +0100, Tom Evans wrote:
>> Hi all
>>
>> I've been using the intel xorg driver for quite some time now, and
>> recently upgraded Xorg server/drm/intel driver to the most current
>> available in ports. This has caused a significant performance regression
>> when running without direct rendering enabled, which is required with
>> this driver to achieve Virtual desktop with a dimension greater than
>> 2048 pixels. Xorg now chews through 30-35% CPU whilst tailing a log
>> file, where as before this used 3-4%. The effect is visibly noticeable
>> (and doesn't just apply to fast moving text!)
>>
>> I have an HP laptop with a 1400x1050 LVDS panel, with a 1280x1024 TFT
>> attached to the VGA port. My preferred setup is:
>>
>> xrandr --output LVDS --mode 1400x1050 --output VGA --mode 1280x1024
>> --left-of LVDS
>>
>> What I am running now, the only way to get sane performance:
>>
>> xrandr --output LVDS --mode 1024x768 --output VGA --mode 1280x1024 --above
>> LVDS
>>
>> I've tried reverting back to an older driver, but it seems that changes
>> to libdrm prevent that. I fear I may have to roll back drm, mesa,
>> xorg-server et al just to use a different driver version.
>>
>> Any tips?
>>
>> Cheers
>>
>> Tom
>
> I've just re-read this, and it isn't clear at all, my bad!
>
> First off, I forgot to mention what fbsd version I am using:
> FreeBSD zoot.mintel.co.uk 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #9: Mon
> Sep 15 16:06:57 BST 2008
> root at zoot.mintel.co.uk:/data2/FreeBSD/RELENG_7/obj/data2/FreeBSD/RELENG_7/src/sys/ZOOT
>  i386
>
> What I really need help with is, if I want to rollback to and use an
> earlier version of the intel driver, what other packages should I also
> roll back? The compilation failure of xf86-video-intel-2.2.1_1 (and
> earlier versions) is:
>
>   In file included from i810_driver.c:88:
>   i830.h:74:20: error: xf86mm.h: No such file or directory
>
> Googling tells me that this is due to a libdrm change, so obviously that
> must be downgraded, which probably will require an earlier version of
> xorg-server as well. Any notable others that will need to be downgraded?
>

It is known that new libdrm cause obsolete xf86-video-i810 to be
marked as broken port.
 For start just downgrade libdrm to 2.3.0 and try again.