Regression with Radeon Mobility TI PB & kernel 2.6.15.4
Since last summer/June I have not been able to use current kernels
because I have been experiencing regression with the display on my
PowerBook TI Radeon Mobility (M6). The last working kernel I can switch
from X (GDM and session) to console and back without any problems was
kernel 2.6.11.9. I have been downloading the vanilla kernels from
kernel.org and compiling them my self and each one has the same issues.
Today I picked up a new kernel from http://rsync.ppckernel.org/ and
rsync to that kernel. Then I took the old 2.6.12.2 kernel config from
http://www.ppckernel.org/specialized.php and did a make oldconfig to
the updated one and I still get the same issues.
I have noticed that Jesus Climent had the same issue back on June 3 of
last year.
On Fri, 2005-06-03 at 08:43 +0200, Jesus Climent wrote:
> Hi
>
> I am experiencing a regression with 2.6.12-rc5 under my iBook G3 2.2.
>
> The problems are as follows:
>
> 1. When switching from console to X, the X picture is redrawn color layer by
> color layer, like an old 3d modeling program, recalculating the surfaces and
> showing them as they are calculated. It takes around 1 second or 2 to get the
> screen back.
>
> 2. When the screen dims to level 0, i am not able to recover it back. To the
> point that blindly one i posted my root passwd on an open irc session i did
> not remember having on one of the VTs. So the computer is on and works, but
> the screen level is set to 0 and never recover. A sleep cycle does not help.
>
>
Has there been any work around on the bug as Ben had mentioned?
Benjamin Herrenschmidt wrote:
>
>Hrm... The actual "delay" thing is to work around a chip bug on M6
>chips. ATI didn't give me a better workaround than stuffing a delay
>after each PLL register accesses which can be a bit slow.
>
>Regarding the LCD, that's a bit more annoying... You tried I suppose
>playing with the backlight control keys etc... it just doesn't come back
>at all ? Hrm... I just never manage to get a proper sequence of
>backlight control that works for everybody it seems. When fixing some
>models, I break others....
>
>I'll try to come up with a patch for you after 2.6.12 is out, it's too
>late for 2.6.12 itself unfortunately. Please remind me if you don't hear
>from me again on this matter.
>
>Ben.
>
>
I have not been able to find any solutions on the lists and I am seeking
any help because I would love to update my kernel.
I am very perplexed.
-Adam
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