[DRI] savage slow with 24 bit depth.

[NoWhereMan (e.vacchi)]

I had the firefox scroll button bug (scrolling too fast makes it history back and forth). I know it's just a matter of adding one line only, but on launchpad it says xserver it's not reconfigured on updates, so I thought it was time to dpkg- reconfigure xserver-xorg
ARGH!
my dri has got MUCH slower, so I took my old xorg.conf and restored it back
now, FYI, here's the two files, so that you can't compare and maybe the dev guys can solve the "issue". I think it's related to the wacom driver (as I can't see nothing more...).

I posted the two xorg.conf here:
http://ubuntuforums.org/showthread.php?p=923642#post923642

thanx
--NoWhereMan

[Tormod Volden (tormodvolden)]

Can you please confirm that _only_ putting in the wacom sections make the DRI slower? Or is it something with your different Device options?

[NoWhereMan (e.vacchi) (uncommonnonsense)]

yes, you can diff the two xorg.conf I posted but I there aren't any other differencies (something about composite but i tried switching it iff/on either and it didn't change anything).

[Tormod Volden (tormodvolden)]

There is a bunch of differences, that's why it would be nice if you could cleanly try to insert the wacom sections only.

Precisely what xorg server and what version are you using?

Please attach the Xorg.0.log (both the slow and the fast) also.

[NoWhereMan (e.vacchi) (uncommonnonsense)]

i've tried adding to the working configuration first the synpatic device, then disabled and added wacom and in fact i didn't experienced slow downs, so the problem must be somewhere else: dpkg-reconfigure'ing xserver-xorg still brings the problem up
unfortunately, due to lack of time, I can't do any further test, but I'll attach my logs

[NoWhereMan (e.vacchi) (uncommonnonsense)]

i've tried adding to the working configuration first the synpatic device, then disabled and added wacom and in fact i didn't experienced slow downs, so the problem must be somewhere else: dpkg-reconfigure'ing xserver-xorg still brings the problem up
unfortunately, due to lack of time, I can't do any further test, but I'll attach my logs

[Tormod Volden (tormodvolden)]

There is still the Option "XaaNoOffscreenPixmaps" different between your configurations.

[NoWhereMan (e.vacchi) (uncommonnonsense)]

no, that's not the problem. i added that to try xair but it didn't work, so i reverted to standard xorg and just left there the option. i added that line to the slower conf, so that i could try, and it didn't change anything...

last test: tried to remove the synaptic driver (from slow) to see if conflicted with wacom still no luck; tried to add "RenderAccel" no luck... i really don't know..

[Tormod Volden (tormodvolden)]

Can you please try to make the "slow" and "fast" configuration as close to each other as possible, and then post the diff? So far, you have said that the wacom stuff is not the problem, and that the options that are different in the two versions do not change anything. Well then, insert the wacom stuff and the same options in both versions and check it please.

What kind of "slow downs" do you experience? Do you have numbers from our beloved non-benchmark benchmarking tool glxgears?

[Fabio Massimo Di Nitto (fabbione)]

Please post all the diffs and configs here too. The forums are not an official bug tracker.

[Fabio Massimo Di Nitto (fabbione)]

-(**) SAVAGE(0): Depth 16, (--) framebuffer bpp 16
-(==) SAVAGE(0): RGB weight 565
+(**) SAVAGE(0): Depth 24, (--) framebuffer bpp 32
+(==) SAVAGE(0): RGB weight 888

This is the relevant issue. Mostlikely DRI doesn't work in 24/32 bit. Try to swich back to 16 bit and let us know.

Fabio

[NoWhereMan (e.vacchi) (uncommonnonsense)]

Confirmed. Switching to 16bit worked

[Jarno Suni (jarnos)]

But nobody uses 16 bit color space nowdays, it is not "true color". Is there some way to get DRI work in 24 bit modes?

[Pablo Castellano (pablocastellano)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering is this still an issue for you? Can you try with latest Ubuntu release? Thanks in advance.

[Bryce Harrington (bryce)]

[This is an automatic notification.]

Hi NoWhereMan,

This bug was reported against an earlier version of Ubuntu, can you
test if it still occurs on Lucid?

Please note we also provide technical support for older versions of
Ubuntu, but not in the bug tracker. Instead, to raise the issue through
normal support channels, please see:

    http://www.ubuntu.com/support

If you are the original reporter and can still reproduce the issue on
Lucid, please run the following command to refresh the report:

  apport-collect 39647

If you are not the original reporter, please file a new bug report, so
we can work with you as the original reporter instead (you can reference
bug 39647 in your report if you think it may be related):

  ubuntu-bug xorg

If by chance you can no longer reproduce the issue on Lucid or if you
feel it is no longer relevant, please mark the bug report 'Fix Released'
or 'Invalid' as appropriate, at the following URL:

  https://bugs.launchpad.net/ubuntu/+bug/39647

[Bryce Harrington (bryce)]

We're closing this bug since it is has been some time with no response from the original reporter. However, if the issue still exists please feel free to reopen with the requested information. Also, if you could, please test against the latest development version of Ubuntu, since this confirms the bug is one we may be able to pass upstream for help.