Blank (disconnected) screen during boot with latest 2.6.35-rcX kernels

[Alex Deucher]

On Tue, Jul 20, 2010 at 5:54 PM, trapDoor <trapdoor6 at gmail.com> wrote:
>> The attached patch should fix the connectors to report properly.
>> There are a number of similar ASUS cards with the same quirk.
>>
>
> Right. I have applied your second patch on top of 2.6.35-rc5-git4 +
> 0001-drm-radeon-kms-fix-shared-ddc-harder.patch
>
> After successful boot from the new kernel, these lines in Xorg.0.log
> corresponds now to the outputs I have on my card:
>
> ### for LCD connected to the first DVI port:
> [    19.582] (II) RADEON(0): Output DVI-0 connected
> [    19.582] (II) RADEON(0): Output DIN disconnected
> [    19.582] (II) RADEON(0): Output DVI-1 disconnected
> [    19.582] (II) RADEON(0): Using exact sizes for initial modes
> [    19.582] (II) RADEON(0): Output DVI-0 using initial mode 1920x1080
>
> ### LCD connected to the other DVI port:
> [    18.068] (II) RADEON(0): Output DVI-0 disconnected
> [    18.068] (II) RADEON(0): Output DIN disconnected
> [    18.068] (II) RADEON(0): Output DVI-1 connected
> [    18.068] (II) RADEON(0): Using exact sizes for initial modes
> [    18.068] (II) RADEON(0): Output DVI-1 using initial mode 1920x1080
>
> HDMI output isn't listed any more. So that's seems good. Thanks a lot
> for fixing this.

Thanks for testing.

>
> I'm just wondering now what will happen if I connect some HDMI device
> via DVI > HDMI adaptor. Should it work? Is HDMI still supported on my
> card after applying the last patch? Unfortunately I don't own any
> device I could test it on.

It will not affect your ability to use HDMI.  It only affects the naming.

>
> Do you expect any problems with applying this patch onto 2.6.34.1? If
> not, I could do it as on that kernel the first DVI port is still shown
> as HDMI. If the patch works OK on 2.6.34.1, it could be submitted
> upstream to the stable branch ?

I'll CC stable.

>
>>>
>>> Where I see a real 3D performance drop now is for example Armagetron
>>> Advanced - a game I use just for testing. I enabled certain features
>>> using 3D in it. Without going into details I just say that with kernel
>>> 2.6.34.1 the overall 3D performance in AA is about twice better. The
>>> game runs quite smooth, number of fps doesn't go under 60. With kernel
>>> 2.6.35-rc5-git3 on the same system, with the same drivers, mesa, drm
>>> etc., the game runs slower and not so smooth, certain details look
>>> slightly worse and I won't get more than 35 fps.
>>>
>>> Apart from that I don't notice any regressions on my desktop, with
>>> compiz effects etc. I'd run some other tests if you could recommend
>>> some tools, but not too complex and rather some specialised software
>>> just for testing purposes, not games.
>>
>> If it's just the kernel that changed is there any chance you could
>> bisect what caused the performance regression?
>>
>
> I could find some time for bisecting tomorrow around evening. Prior to
> that I'd need a quick look into some manuals ..
>

Sounds good.

Alex

>
> --
> Regards
> trapDoor
>