[PATCH] change the type of Unichrome display adapter (PCI ID=1106:3108) - Kernel

This is a discussion on [PATCH] change the type of Unichrome display adapter (PCI ID=1106:3108) - Kernel ; From: Márton Németh Change the type of Unichrome display adapter with PCI ID=1106:3108 to get rid of message "irq 16: nobody cared". See http://bugzilla.kernel.org/show_bug.cgi?id=8641 for details. Signed-off-by: Shankar Giri V Signed-off-by: Márton Németh --- --- linux-2.6.25-rc5/drivers/char/drm/drm_pciids.h.orig 2008-03-15 10:58:49.000000000 +0100 +++ ...

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Thread: [PATCH] change the type of Unichrome display adapter (PCI ID=1106:3108)

  1. [PATCH] change the type of Unichrome display adapter (PCI ID=1106:3108)

    From: Márton Németh

    Change the type of Unichrome display adapter with PCI ID=1106:3108 to
    get rid of message "irq 16: nobody cared".

    See http://bugzilla.kernel.org/show_bug.cgi?id=8641 for details.

    Signed-off-by: Shankar Giri V
    Signed-off-by: Márton Németh
    ---

    --- linux-2.6.25-rc5/drivers/char/drm/drm_pciids.h.orig 2008-03-15 10:58:49.000000000 +0100
    +++ linux-2.6.25-rc5/drivers/char/drm/drm_pciids.h 2008-03-15 10:59:31.000000000 +0100
    @@ -335,7 +335,7 @@
    {0x1106, 0x3118, PCI_ANY_ID, PCI_ANY_ID, 0, 0, VIA_PRO_GROUP_A}, \
    {0x1106, 0x3122, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, \
    {0x1106, 0x7205, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, \
    - {0x1106, 0x3108, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, \
    + {0x1106, 0x3108, PCI_ANY_ID, PCI_ANY_ID, 0, 0, VIA_PRO_GROUP_A}, \
    {0x1106, 0x3344, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, \
    {0x1106, 0x3343, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, \
    {0x1106, 0x3230, PCI_ANY_ID, PCI_ANY_ID, 0, 0, VIA_DX9_0}, \
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  2. Re: [PATCH] change the type of Unichrome display adapter (PCI ID=1106:3108)

    Németh Márton wrote:
    > From: Márton Németh
    >
    > Change the type of Unichrome display adapter with PCI ID=1106:3108 to
    > get rid of message "irq 16: nobody cared".
    >
    > See http://bugzilla.kernel.org/show_bug.cgi?id=8641 for details.
    >
    > Signed-off-by: Shankar Giri V
    > Signed-off-by: Márton Németh
    > ---
    >
    > --- linux-2.6.25-rc5/drivers/char/drm/drm_pciids.h.orig 2008-03-15 10:58:49.000000000 +0100
    > +++ linux-2.6.25-rc5/drivers/char/drm/drm_pciids.h 2008-03-15 10:59:31.000000000 +0100
    > @@ -335,7 +335,7 @@
    > {0x1106, 0x3118, PCI_ANY_ID, PCI_ANY_ID, 0, 0, VIA_PRO_GROUP_A}, \
    > {0x1106, 0x3122, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, \
    > {0x1106, 0x7205, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, \
    > - {0x1106, 0x3108, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, \
    > + {0x1106, 0x3108, PCI_ANY_ID, PCI_ANY_ID, 0, 0, VIA_PRO_GROUP_A}, \
    > {0x1106, 0x3344, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, \
    > {0x1106, 0x3343, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, \
    > {0x1106, 0x3230, PCI_ANY_ID, PCI_ANY_ID, 0, 0, VIA_DX9_0}, \
    >
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    Nope, this is not a correct fix. It enables a set of DMA commands not
    available on the K8M800, also it makes the via IRQ handler just report
    "Handled" when in fact the device keeps firing 200 000 or so interrupts
    per second.

    I'm 99.99 % convinced that this is a hw bug, and it also appears in the
    KM400 chipsets. When VIA was asked about it they replied that IRQ
    functionality was never verified in the K8M800 since the windows driver
    never used it. They only use IRQ for video capture transfer, and there
    is no video-in on K8M800s. Other unichromes with the same IRQ register
    interface work fine.
    Having said that, it's not impossible that there may be a hidden
    register somewhere that makes it all work.

    The K8M800 irqs have been turned off in newer versions of the openChrome
    2D driver to work around this issue.

    /Thomas





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