915gm/945gm/XAA lockup with gray blocks when switching video mode
jbarnes at virtuousgeek.org
Fri Oct 12 15:32:35 PDT 2007
On Friday, October 12, 2007 1:09 pm Peter Clifton wrote:
> Strictly speaking, we're now not restoring the full set of the video
> chips registers, so perhaps if your bios knows how to re-program the
> chip and say connect an external monitor to the other pipe, we'll
> have left it with a bad palette. IMO, thats better than the crashes,
> and perhaps something Intel will sort out "properly". I didn't want
> to delve into how complex it might be to deliberately program both
> pipelines just for the sake of restoring their palette regs.
Yeah, there are some other registers we don't save/restore, but we're
addressing that (along with making the whole procedure a lot faster and
more robust) by moving the save/restore code into the kernel. BIOS
interaction may remain an issue on some platforms...
> I noticed a similar register not-cleanly reinit in the probing of the
> tv output. A patch to fix this is:
> Index: xserver-xorg-video-intel-2.1.1/src/i830_tv.c
> --- xserver-xorg-video-intel-2.1.1.orig/src/i830_tv.c 2007-10-12
> 11:57:15.000000000 +0100 +++
> xserver-xorg-video-intel-2.1.1/src/i830_tv.c 2007-10-12
> 11:57:18.000000000 +0100 @@ -1361,6 +1361,7 @@
> if (crtc)
> i830_tv_detect_type (crtc, output);
> + i830_tv_restore (output);
> i830ReleaseLoadDetectPipe (output, dpms_mode);
Eric would have to comment on this one...
Thanks for looking into these issues.
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