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    SubjectRe: [PATCH] atyfb: fix distorted image on PowerMacs
    On Fri, 30 Jan 2009 14:42:50 +1100 Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

    > On Thu, 2009-01-22 at 20:22 +0200, Risto Suominen wrote:
    > > Since the complete re-write in 2.6.10, some PowerMacs (At least PowerMac 5500
    > > and PowerMac G3 Beige rev A) with ATI Mach64 chip have suffered from unstable
    > > columns in their framebuffer image. This seems to depend on a value (4) read
    > > from PLL_EXT_CNTL register, which leads to incorrect DSP config parameters to
    > > be written to the chip. This patch uses a value calculated by aty_init_pll_ct
    > > instead, as a starting point.
    > >
    > > Signed-off-by: Risto Suominen <Risto.Suominen@gmail.com>
    > > ---
    > > The testing is done on kernel version 2.6.18.
    >
    > This also fixes my oooold wallstreet powerbook.
    >
    > Andrew, do you mind if I include that in the powerpc tree ?

    Go wild.

    Please don't to forget to add 'Cc: <stable@kernel.org>' to the changelog
    if you consider a backport to be appropriate.


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