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Thread: What Not To Expect From The Linux 2.6.40 Kernel

  1. #11
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    Jan 2009
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    Quote Originally Posted by michal View Post
    "The Reiser4 file-system still has not been proposed for integration into the mainline Linux kernel tree"

    Who gives a flying ship about reiser4?
    i am. do you mind ?

  2. #12
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    With the open-source Radeon kernel driver, there still is not the bits in place yet for implementing Hyper-Z and Radeon HD 5000/6000 series HDMI audio support...
    Damn. I recall when R700 HDMI audio support was added towards the end of 2009, and when HDMI audio support under KMS was added in 2010. I just assumed that this would carry over to R800 (HD5000), but apparently not.

    I recently got a couple of HD5450's and although they are not being used in HTPC's, I was looking forward to connecting them to my TV via HDMI occasionally.

    Is anyone working on this? I can't program, but I might be able to help with testing.

  3. #13
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    Default HDMI audio broken in 2.6.40?

    It looks like HDMI audio may be more generally broken in 2.6.40 - see here in FedoraForums http://www.fedoraforum.org/forum/sho...d.php?t=267793 I had pretty much the identical experience to the OP here, specifically:-
    • No HDMI audio, even though no error messages and PA volume control shows active sound levels in bars. Other sound output devices OK.
    • Flash video jerky and 2-3 times speeded up. This is with Adobe proprietary x86_64 beta Flash plugin
    • All MythTV video - file, DVD or live TV (DVB-T) - fast & jerky, same as with Flash plugin. However same video content (file or DVD) plays OK in other applications (Kaffeine, Dragon)...apart from no HDMI audio

    I am on x86_64. Graphics card is HD 4670 (RV730) with X.Org radeon driver and KMS. However the HDMI audio problem appears to be independent of graphics hardware / driver, and distribution. It is conceivable that the HDMI audio and video playback issues are independant, and just came up together. If I boot into 2.6.38.8-35 everything goes back to normal.

    There are some reports that the HDMI audio at least is fixed in the very latest kernel versions; however it looks like quite a significant regression.

    Andrew

  4. #14
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    Quote Originally Posted by AndyW View Post
    It looks like HDMI audio may be more generally broken in 2.6.40 - see here in FedoraForums http://www.fedoraforum.org/forum/sho...d.php?t=267793 I had pretty much the identical experience to the OP here, specifically:-
    • No HDMI audio, even though no error messages and PA volume control shows active sound levels in bars. Other sound output devices OK.
    • Flash video jerky and 2-3 times speeded up. This is with Adobe proprietary x86_64 beta Flash plugin
    • All MythTV video - file, DVD or live TV (DVB-T) - fast & jerky, same as with Flash plugin. However same video content (file or DVD) plays OK in other applications (Kaffeine, Dragon)...apart from no HDMI audio

    I am on x86_64. Graphics card is HD 4670 (RV730) with X.Org radeon driver and KMS. However the HDMI audio problem appears to be independent of graphics hardware / driver, and distribution. It is conceivable that the HDMI audio and video playback issues are independant, and just came up together. If I boot into 2.6.38.8-35 everything goes back to normal.

    There are some reports that the HDMI audio at least is fixed in the very latest kernel versions; however it looks like quite a significant regression.
    Alex disabled audio by default in radeon. Lovely, isn't it?

    Add "radeon.audio=1" to GRUB.

  5. #15

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    Quote Originally Posted by dfx. View Post
    i am. do you mind ?
    Why not? It's a killer filesystem. (an oldie but a goodie)

  6. #16

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    Quote Originally Posted by Zajec View Post
    Alex disabled audio by default in radeon. Lovely, isn't it?
    Why did he do that?

    Add "radeon.audio=1" to GRUB.

  7. #17
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    The current hdmi code causes blank screens on a lot of systems if audio is enabled. Until that gets fixed properly, I thought it better to disable it.

  8. #18
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    Quote Originally Posted by agd5f View Post
    The current hdmi code causes blank screens on a lot of systems if audio is enabled. Until that gets fixed properly, I thought it better to disable it.
    Hard to say. You disabled audio which was working on (almost?) all R6xx/R7xx cards and you confused a lot of users by that. In pure math it could be easier for bug-affected users to disable audio with "radeon.audio=0". However, on the other hand, having modesetting working well is much more important than having feature like audio.

    Can someone with account on fedoraforum.org explain Fedora users the issue? http://www.fedoraforum.org/forum/sho...=267793&page=2

  9. #19
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    Yeah, it's a tough call. Unfortunately, it's dependant on the TV/monitor and how it interprets the hdmi packets. Blank screen is not something a lot of users can deal with, so I opted to go in favor of working display for now.

  10. #20
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    UK
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    Thanks for the suggestions and explanation. With this parameter HDMI audio is restored, and the other video playback issues are fixed as well - so they obviously share the same underlying cause. I have cross-posted over on FedoraForum as well.

    Thanks,
    Andrew

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