On Mon, 7 Jan 2008, cksim wrote:
> Lately, I have observed an odd behviour in kernel 2.6.23.1 on a 800x480 TFT
> LCD unit.
>
> The odd behviour as follows:
> 1) I am using Atmel AT91SAM9261 part. Circuit similar to that of
> AT91SAM9261EK evaluation board.
>
> 2) I am booting the kernel and mounting root filesystem through NFS.
> Bootloader used is UBoot 1.1.5.
>
> 3) During kernel startup, the LCD screen shows the "Penguin" logo with the
> other console output messages.
>
> 4) Everything looks fine up to this point. For example, the 0,0 position of
> image on LCD is proper and correct.
>
> 5) The root filesystem is then mounted through NFS and followed by a message
> "Freeing init memory: 106K". All this are fine.
>
> 6) During the execution of init scripts and the login prompt, the image on
> the screen starts shifting (either left, right, up or down). For example, the
> 0,0 position of the LCD image is shifted. However, the image content is still
> correct.
>
> 7) After login, this image shift behaviour still exists during normal usage.
>
> In contrast, when using kernel 2.6.21, the image shift behaviour was not
> observed before the login prompt. Image shift after the login does happen
> occasionally but not as frequent as that seen in 2.6.23.1.
>
> Has anyone encountered a similar image shift issue ?
>
> Is this issue related to kernel ? It appears to me that some timing causes
> the image shifting.
Probably it's related to the frame buffer driver for your board.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [EMAIL PROTECTED]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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