[Bug 20061] New: Radeon RS690 (X1250) back screen after return from text VT or DPMS off

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=20061

           Summary: Radeon RS690 (X1250) back screen after return from text
                    VT or DPMS off
           Product: xorg
           Version: 7.4
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: crosser at average.org
         QAContact: xorg-team at lists.x.org


Created an attachment (id=22812)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=22812)
lspci -v

I run Ubuntu Jaunty 64bit on Asus M2A-VM, with AMD G980(?) chipset, integrated
Radeon X1250, with Viewsonic VP201b monitor connected via DVI port. It starts
and works fine, requiring only "AccelMode EXA" to alleviate the problem from
bug #2772.  The CPU us Athlon X2 5600+, normally running at 1GHz because of
default "ondemand" governor.

After switch to another (textmode) VT, and return back, I get black screen,
with backlight on, indicator light on the monitor green. When I leave the
computer in X mode for long enough, the monitor eventually goes to powersaving
mode, with backlight off and indicator light amber. When I hit some keys, the
backlight on the monitor turns on, but the indicator light remains amber, and
screen blank. If I switch to a text VT, the indicator light turns green, the
"DVI-D input" icon appears briefly on the screen (as it should, monitor
feature), and I see the text console. When I switch to the X VT, I see black
screen again. When I restart the GDM, I briefly see the text output of the Xorg
server, and then the screen is black again. All the time, input works, I can
hear sounds of GDM or session start if I log in blindly.

If I change the CPU governor from "ondemand" to "performance", thus upping CPU
speed to nominal 2.9GHz (from a text console or ssh session), then switching
from text to graphic VT *sometimes* work, after a long (10 - 30 seconds) delay.
When I restart GDM, I get working graphic login screen *most of the time*, and
again, after a long delay. (When X starts first time after boot, the is no long
delay, just a few seconds).

I observed similar behavior with older xorg, and older kernels, under Ubuntu
intrepid (64bit) and Slackware 12.2 (32bit). Behavior is the same with and
without "AccelMode EXA", with and without compiz.

System:
Linux pccross 2.6.28-7-generic #20-Ubuntu SMP Mon Feb 9 15:42:34 UTC 2009
x86_64 GNU/Linux

Eugene


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