Bug#481361: xserver-xorg-video-ati: No display on DVI output

["Alex Deucher" <alexdeucher@gmail.com>]

On Fri, May 16, 2008 at 10:23 AM, Alex Deucher <alexdeucher@gmail.com> wrote:
> On Fri, May 16, 2008 at 10:16 AM, Francois Gouget <fgouget@free.fr> wrote:
>  > On Fri, 16 May 2008, Alex Deucher wrote:
>  >  [...]
>  >  > 1920x1200 is probably a bit much for your card bandwidth-wise.
>  >
>  >  Sure, this graphics card is pretty old and not very powerful. However:
>  >   * I used it to drive the VGA output in 1920x1440x75Hz for 7 years with
>  >    my 21" CRT.
>  >   * About 6 months ago I switched to an LCD screen and used it to drive
>  >    the DVI output at 1920x1200x60Hz without trouble.
>  >   * It's only last wednesday when I upgraded that the DVI output stopped
>  >    working at all.
>  >   * I have since downgraded the driver to and I'm using the DVI output in
>  >    1920x1200x60Hz (as confirmed by both xrandr 1.1 and my LCD screen).
>  >
>
>  The the driver was substantially rewritten for xrandr 1.2 support.
>  The mode handling has changed a lot.
>
>
>  >  So it's not a hardware problem.
>  >
>  >
>  >  > Do lower resolutions work ok?  (1680x1050 or 1024x768) You might try
>  >  > reducing your color depth to 16 bits.
>  >
>  >  I thought about an issue with the single-link DVI bandwidth limit too.
>  >  So I tried 1600x1200x60Hz and 1024x768x60Hz and neither worked. I did
>  >  not try 16 bits mode.
>  >
>  >
>  >  > The following options may also
>  >  > help: Option "DefaultTMDSPLL" "TRUE" Option "DisplayPriority" "HIGH"
>  >  >
>  >  > If that doesn't help, try a modeline with a reduced refresh rate (50
>  >  > hz rather than 60):
>  >  > Modeline "1920x1200_50.00_rb"  127.75  1920 1968 2000 2080  1200 1203
>  >  > 1209 1229  +HSync -Vsync

if none of that helps can you try the attached patches and let me know
which, if any, help?

Alex

diff --git a/src/legacy_crtc.c b/src/legacy_crtc.c
index 489fecf..a4031ee 100644
--- a/src/legacy_crtc.c
+++ b/src/legacy_crtc.c
@@ -1708,7 +1708,7 @@ legacy_crtc_mode_set(xf86CrtcPtr crtc, DisplayModePtr mode,
     RADEONInfoPtr info = RADEONPTR(pScrn);
     int i = 0;
     double dot_clock = 0;
-    int pll_flags = RADEON_PLL_LEGACY;
+    int pll_flags = RADEON_PLL_LEGACY | RADEON_PLL_DCE3 | RADEON_PLL_USE_REF_DIV;
     Bool update_tv_routing = FALSE;
     Bool tilingChanged = FALSE;
 

diff --git a/src/legacy_crtc.c b/src/legacy_crtc.c
index 489fecf..f1894df 100644
--- a/src/legacy_crtc.c
+++ b/src/legacy_crtc.c
@@ -1708,7 +1708,7 @@ legacy_crtc_mode_set(xf86CrtcPtr crtc, DisplayModePtr mode,
     RADEONInfoPtr info = RADEONPTR(pScrn);
     int i = 0;
     double dot_clock = 0;
-    int pll_flags = RADEON_PLL_LEGACY;
+    int pll_flags = RADEON_PLL_LEGACY | RADEON_PLL_DCE3;
     Bool update_tv_routing = FALSE;
     Bool tilingChanged = FALSE;
 

diff --git a/src/legacy_crtc.c b/src/legacy_crtc.c
index 489fecf..937d269 100644
--- a/src/legacy_crtc.c
+++ b/src/legacy_crtc.c
@@ -1708,7 +1708,7 @@ legacy_crtc_mode_set(xf86CrtcPtr crtc, DisplayModePtr mode,
     RADEONInfoPtr info = RADEONPTR(pScrn);
     int i = 0;
     double dot_clock = 0;
-    int pll_flags = RADEON_PLL_LEGACY;
+    int pll_flags = RADEON_PLL_LEGACY | RADEON_PLL_USE_REF_DIV;
     Bool update_tv_routing = FALSE;
     Bool tilingChanged = FALSE;