[Bug 28627] New: 2.6.31.6 is the last kernel where KMS works well on an RV515 card for regular PCI

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28627

           Summary: 2.6.31.6 is the last kernel where KMS works well on an
                    RV515 card for regular PCI
           Product: DRI
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: connor.behan@gmail.com


After constant regressions, I thought I would post this.

dmesg.good: http://pastebin.com/kL3iXTU3
xorglog.good: http://pastebin.com/n7diwRCL
glxinfo.good: http://pastebin.com/aDajgYQC

dmesg.bad: http://pastebin.com/JSKSD8Dn
xorglog.bad: http://pastebin.com/QdDhfknr
glxinfo.bad: http://pastebin.com/AWabZKN8

dmesg.reallybad: http://pastebin.com/Jc4sqySK
xorglog.reallybad: http://pastebin.com/fzMEJfZH
glxinfo.reallybad: http://pastebin.com/tkJgTgKa

Good is kernel 2.6.31.6 where I get glxgears frame rates of ~300fps. This is
all I can expect from a slow PCI bus.

Bad is kenel 2.6.33.4 where the glxgears frame rates are a little slower, maybe
250fps and quitting X fails. Logging out of my desktop environment,
Ctrl+Alt+F2, Ctrl+Alt+Backspace, chvt commands, all of these freeze my system.

Reallybad is kernel 2.6.33.4 where glxgears has no consistent frame rate. It
jumps around between 5fps and 60fps and all graphical programs are incredibly
slow. This is in addition to the zapping issue described above.

I am not sure why 2.6.33.4 is sometimes bad and sometimes reallybad. It might
have to do with what USB devices are connected when it boots up.

Please do not tell me to upgrade my userspace programs. I have tried every
combination of xorg-server, mesa, xf86-video-ati and libdrm and none of them
have any effect. The kernel is the ONLY package that changes how bad this bug
is. Also please do not tell me to upgrade the kernel unless you are very sure
that the version you are suggesting fixes this bug and you can tell me why it
fixes it.

I am not looking for a kernel that works. I KNOW which kernel works. I am
trying to understand WHY it is the only one that works and hopefully help you
fix this. Thank-you very much.

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