Bug#572311: No display output from Radeon RV610 on Alpha

[Michael Cree]

On 04/03/10 04:39, Alex Deucher wrote:
> On Wed, Mar 3, 2010 at 3:04 AM, Michael Cree<mcree at orcon.net.nz>  wrote:
>> Package: xserver-xorg-video-ati
>> Version: 1:6.12.4-3
>> Severity: important
>>
>> On X startup monitor goes comletely dead, i.e., no signal on DVI output with
>> a Radeon RV610 card on Alpha architecture.  On another Alpha with a Radeon
>> R100 card output (on VGA) comes up fine so appears problem is only seen with
>> newer Radeon cards.
>>
>> Interestingly if I compile debian source for the ati driver with the -mbwx
>> compiler flag (which permits the compiler to use the byte-word extension
>> supported only on Alpha CPUs since the EV56) then I get a working radeon
>> video driver on the Alpha with the RV610 video card.  The display comes up
>> fine and dandy.
>>
>> This is suggestive that somewhere in the Radeon driver a byte or word access
>> is being made into the video card's register bank without going through the
>> Xserver's MMIO_IN/OUT routines.
>
> I wonder if it's the legacy vga save/restore.  Does:
> Option "VGAAccess" "FALSE"
> help?

No, that doesn't help.  Still get no output.

The following lines were seen in the Xorg.log confirming that the option 
was indeed acted upon:

(**) RADEON(0): Option "VGAAccess" "FALSE"
(II) RADEON(0): VGAAccess option set to FALSE, VGA module load skipped

Cheers
Michael.