Re: [Linux-fbdev-devel] [Bugme-new] [Bug 10205] New: BUG: Display gets corrupted when using lxfb driver on a GeodeLX 5535 based chipset

[Andrew M. <ak...@li...>]

On Sun,  9 Mar 2008 08:55:52 -0700 (PDT) bug...@bu... wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=10205
> 
>            Summary: BUG: Display gets corrupted when using lxfb driver on a
>                     GeodeLX 5535 based chipset
>            Product: Drivers
>            Version: 2.5
>      KernelVersion: 2.6.24.2
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Console/Framebuffers
>         AssignedTo: jsi...@in...
>         ReportedBy: nes...@gm...
> 
> 
> Latest working kernel version:
>  None or unknown
> Earliest failing kernel version:
>  Latest version
> Distribution:
>  Debian Stable (Etch)
> Hardware Environment:
>  AMD Geode 32 bit A830 board, 5536 chipset based embedded computer (TFT 10"
>  800x600), with GeodeLX embedded GPU. It's webpage is at:
>  http://www.winmatev.com.tw/PPc/PPcSpec.asp?Prod=03_0013&Typeid=03020101
>  I own a cheaper version using GeodeGX 500 processor, 256MiB RAM, no
>  touchscreen.
> Software Environment:
>  Debian 4.0 Stable (Etch), Kernel 2.4.22.2 vanilla + AUFS patch (it has nothing
>  to do with graphics, but BTW...), all i386, kernel specifically compiled for
>  Geode GX/LX Processor target (but also does not work for generic i386 target).
> Problem Description:
>  I get a blurry screen when trying to enable Framebuffer, vga=788
>  option (800x600). Screen gets corrupted, but when I start X.org, it shows
>  Ok, until I switch again to console. Everything works fine with Vesa FB,
>  except that, of course, it's more CPU consuming and slower [supposedly].
>  When blurry, screen looks like it was under a lake.
> Steps to reproduce:
>  1) Compile the kernel, include support for GeodeLX Framebuffer.
>  2) Install the kernel on the machine
>  3) Boot it up, adding vga=788 mode to bootloader.
>  4) Screen gets completely blurry until X.org starts.
> 

Guys, this is a post-2.6.24 regression hence needs
running-around-with-your-hair-on-fire priority please.

Can anyone think what we did to cause this?  Recent changes to
drivers/video/geode/ look pretty tame.