Mailinglist Archive: radeonhd (699 mails)

[darcsis@xxxxxxxxx (Denise H. G.)]

Egbert Eich <eich@xxxxxxx> writes:

> Denise H. G. writes:
>  > 
>  > Hi
>  > 
>  > I've got an RS690 chip with pci id 0x791E. It is onboard vga shipped
>  > with Asus M2A-VM motherboard. By using radeonhd driver I also got VSync
>  > problems. And I found that for RS690 we should not write ZERO to the
>  > register D1CRTC_V_SYNC_A, otherwise the screen will blank off on VT
>  > switching. We can safely write non-zero Values to D1CRTC_V_SYNC_A but
>  > never ZERO. Anyway, this works for my chip. I don't know if will apply
>  > to yours.
>  > 
>
> Writing 0 to D1CRTC_V_SYNC_A is certainly wrong. It will most likely
> lead to the behavior you are seeing.
> You said you are seeing a blank screen on restore - 
> Did you find out when this is written? Did this happen during restore?

In ScreenInit there is a rhdSave(), which saves the initial register
values. During this course it saves ZERO for D1CRTC_V_SYNC_A. While
restoring, it always restores ZERO for D1CRTC_V_SYNC_A, despite of
whatever we write to D1CRTC_V_SYNC_A after the rhdSave().

I just put the following in `rhd_crtc.c' to work around the problem for
RS690: 

  in DxSave():

  "if (INREG(Crtc, RegOff + D1CRTC_V_SYNC_A))
        Store->CrtcVSyncA = INREG(Crtc, RegOff + D1CRTC_V_SYNC_A);"

  in DxRestore():

  "if (Store->CrtcVSyncA)
        OUTREG(Crtc, RegOff + D1CRTC_V_SYNC_A, Store->CrtcVSyncA);"


I don't know if it is good, but this solves the VT switching problem for
RS690. hehe
 
> Cheers,
>       Egbert.

-- 
-- 
To unsubscribe, e-mail: radeonhd+unsubscribe@xxxxxxxxxxxx
For additional commands, e-mail: radeonhd+help@xxxxxxxxxxxx