[ATI] Video corruption when connecting external displays

[Ara Pulido]

This is part of the master bug 824099

When connecting external displays, the video gets corrupted.

Affected systems and GPUs:

Lenovo Thinkpad Edge 14 (M92 [Mobility Radeon HD 4500/5100 Series])
Lenovo Thinkpad Edge 15 (ATI Technologies Inc M880G [Mobility Radeon HD 4200])
Lenovo Thinkpad Edge 11 (ATI Technologies Inc: M880G [Mobility Radeon HD 4200])
Dell Precision M6500 (ATI Technologies Inc: M97 GL [ATI FirePro M7740])
Inspiron 1122

[Daniel Manrique (roadmr)]

Hi,

I just retested this with the Oneiric image from 20110823. Tests were done with ATI Technologies Inc NI Seymour [AMD Radeon HD 6470M] graphics on a Toshiba Tecra R850.

Behavior is now improved and I can't reproduce the original problem. External screen works fine with no compiz crashes, I
see a bit of corruption on the unused portions of the screen when rotating any of the displays, however if they are both horizontal things look good. Resolution changes work as expected on both external and internal displays.

Please let me know if I need to test something more specific.

[Ara Pulido (ara)]

Hello Daniel,

Could you test one of the affected systems again with Alpha3, please? Just to double check that it was not a random issue.

Also, could you please file another bug for the compiz crash, please?

Thanks!

[Ara Pulido (ara)]

OK, I just saw you didn't get a crash on this one, but can you double check with Alpha 3?

[Daniel Manrique (roadmr)]

I just tested on the Toshiba Tecra R850 from comment #1, with Oneiric Alpha 3, and confirmed there is corruption on both displays when an external screen is plugged in. The internal screen shows a garbled area at the top, while the external screen is entirely garbled and totally unusable.

This is a fresh A3 install so it's not a random issue.

As per comments 1 and 4 I'll mark this as Fix Released.