[Bug 54381] New: [drm:radeon_atom_pick_pll] *ERROR* unable to allocate a PPLL

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https://bugzilla.kernel.org/show_bug.cgi?id=54381

           Summary: [drm:radeon_atom_pick_pll] *ERROR* unable to allocate
                    a PPLL
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.7.2 and up
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx
        ReportedBy: rose@xxxxxxxxxx
        Regression: No


I'm running a 3 monitor setup with a Radeon HD graphics card [Radeon HD 6000
Series]. I'm not using the proprietary drivers. Connectors are: 2 DVI and 1
HDMI. When I change the second DVI connection from a monitor to a projector and
try to set the correct resolution (1920x1080) it fails with the following error
message:

[15189.014994] [drm:radeon_atom_pick_pll] *ERROR* unable to allocate a PPLL
[15189.015008] [drm:drm_crtc_helper_set_config] *ERROR* failed to set mode on
[CRTC:12]

It changes the resolution but there are black areas at the sides and at the
bottom of the displayed picture. It only happens if I connect the projector,
not when the usual monitor is connected. This problem does not exist with
kernel version 3.6.11.

$ scripts/ver_linux 
If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.

Linux semkath-desktop 3.8.0 #1 SMP PREEMPT Wed Feb 20 18:31:08 CET 2013 x86_64
AMD Phenom(tm) II X6 1090T Processor AuthenticAMD GNU/Linux

Gnu C                  4.7.2
Gnu make               3.82
binutils               2.23.1
util-linux             2.22.2
mount                  debug
module-init-tools      12
e2fsprogs              1.42.6
Linux C Library        2.16
Dynamic linker (ldd)   2.16
Procps                 UNKNOWN
Net-tools              1.60_p20120127084908
Kbd                    1.15.5
Sh-utils               8.21
Modules Loaded         snd_aloop kvm_amd firewire_ohci k10temp i2c_piix4
firewire_core

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