[Bug 27184] Radeon, KMS, 6.12.99: Sleeping screen doesn't wake up reliably

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27184

--- Comment #13 from tomi.orava at ncircle.nullnet.fi 2011-11-12 13:12:05 PST ---
I have this very same problem, after the power management puts the lcd-monitor
to sleep, the physical monitor won't wake up anymore without doing a power
off/power on for the lcd-screen. I used the ati catalyst drivers for quite some
time and the display suspend worked just fine ---> whenever the computer
display gets reactivated, also the physical monitor screen gets activated.

To me it looks like the open source radeon driver somehow incorrectly tries to
wake up the monitor without succeeding after previous display suspending.
I saw the same problem a year ago, but then the xf86-video-ati -driver wasn't
anyway ready in supporting this particular video card.
The problem happens every single time when the display gets suspended.

- xorg-server 2:1.9.0-0ubuntu7.6
- xf86-video-ati  6.14.3
- 
- Benq G2400W lcd monitor
- 05:00.0 VGA compatible controller: ATI Technologies Inc Cedar PRO [Radeon HD
5450]

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