[Bug 16389] New: New PM-Code produces white screen on laptop display on startup on an radeon x700

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=16389

           Summary: New PM-Code produces white screen on laptop display on
                    startup on an radeon x700
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.35-rc4
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: kontrollator@gmx.de
        Regression: Yes


After the merge of the new-pm code for radeon it get an all white screen on my
laptop display as soon as kms gets activated. Before the merge it worked as
long as i used radeon.dynpm=1 as boot parameter (without this parameter i also
get an all white screen with earlier kernels).

I can work around it with an vbetool dpms off / on cycle (which uses bios
routines i think), i tried all options / combinations of radeon.hw_i2c and
radeon.new_pll without success. I also get an all white laptop-screen as soon
as i change resolutions on my display, this also can be workaround with an
vbetool dpms off / on cycle. 

This also happens in the non-kms-case with the xorg-driver whenever i change
resolutions, in the old days i could workaround it with the MonitorLayout
"LVDS, none" option, however this option is long gone.

Chipset is an mobility radeon x700 pcie, pci-id is: 1002:5653

Please tell me what more information is needed.

Thank you

Jan Kreuzer

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