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Radeon KMS bug causing wireless crashes, devs please help

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  • Porter
    replied
    OK, I filed a bug report on freedesktop.org and linked to the other reports on Launchpad and Bugzilla.

    https://bugs.freedesktop.org/show_bug.cgi?id=28106


    Apparently it may be due to a difference in PCI configuration between KMS and UMS?

    ?yvind Stegard on Bugzilla had this to say on that...
    Comment #29 From ?yvind Stegard 2010-05-10 17:31:29 (-) [reply] -------

    (In reply to comment #28)
    > Thank you for testing. Appearently, there might be a clash in the PCI device or
    > bus configuration. Unfortunately, I'm not expert in this area. It might be a
    > good idea to check the PCI device setup using lspci (compare good and bad
    > behaviour).

    Indeed, the PCI configuration for radeon is different under KMS (bad) compared
    to UMS (good):
    Code:
    --- lspci-radeon-good.txt    2010-05-10 19:13:21.003538070 +0200
    +++ lspci-radeon-bad.txt    2010-05-10 19:19:45.254230183 +0200
    [...]
    -    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
    +    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
    [...]
    -    Interrupt: pin A routed to IRQ 16
    +    Interrupt: pin A routed to IRQ 30
    [...]
    -    Capabilities: [80] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
    -        Address: 0000000000000000  Data: 0000
    +    Capabilities: [80] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable+
    +        Address: 00000000fee0100c  Data: 41b9
    +    Kernel driver in use: radeon
    There is no difference for the HDA Intel PCI configuration.

    Also, KMS causes problems for my wireless PCI network controller/driver iwl3945 (drops connection during Flash fullscreen video streaming, when snd-hda-intel crackling is at its worst . So, my system probably has issues out of scope for this bug report, wrt. to KMS. Thank you for all help.

    Leave a comment:


  • Porter
    replied
    I'm searching at freedesktop.org for any similar bugs... if I don't find any, I'll file a bug so that it's at least on their radar and they know of the problem.

    If a bug report already exists, or if I create one (either way), I'll link the upstream in the relevant launchpad bugs.

    Leave a comment:


  • nanonyme
    replied
    Out of interest: got some easy way I could see if I can replicate this on Fedora 13? I've never had this kind of problems myself so just wondering. (as in, the audio part, I have no wireless)

    Leave a comment:


  • oyvind
    replied
    Yes, it would be great if this was looked into. I've got affected hardware as well. Problems with audio (crackling not caused by Pulseaudio) and wireless connection dropping when running with radeon KMS, typically triggered by fullscreen movie playback or in general ?GPU load? (for lack of better way to describe it). Both problems disappear when disabling kernel mode setting. Thinkpad Z61m with ATI X1400.

    These are the bugs I am currently tracking wrt. this issue:
    https://bugs.launchpad.net/ubuntu/+s...ux/+bug/564376
    https://bugs.launchpad.net/ubuntu/+s...er/+bug/578342
    https://bugzilla.kernel.org/show_bug.cgi?id=15912
    https://bugs.launchpad.net/ubuntu/+s...ux/+bug/571770

    The three last bugs are related to the audio problems I'm seeing when using KMS, two of which I've filed myself.

    I've been reluctant to file a bug at freedesktop.org so far, because I don't know if radeon KMS is directly to blame, but what I am sure of is that it triggers the problems. Whether there is some general kernel problem or if KMS alters conditions in a way that shake out bugs in other kernel drivers. So far it looks like only people with ATI IGP or Xnnnn-series cards are affected.

    I'm on Ubuntu Lucid x86. Have tested up to mainline kernel 2.6.34-rc7, and the problem persists, so it's not Ubuntu-kernel specific.

    Leave a comment:


  • Porter
    replied
    I forgot to mention (and the edit button is missing)... this is a new problem on Ubuntu 10.04, the bug was present on launch of Lucid final.

    Thanks!

    Leave a comment:

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