[Bug 34534] resolution 3840x1024 stopped to work on HD5850 after switch to 2.6.37 kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=34534

--- Comment #9 from Peter Hercek <phercek@xxxxxxxxx> 2011-04-08 10:40:19 PDT ---
(In reply to comment #8)

xrandr reports the monitor on crtc 1 in both cases (working/non-working):

DVI-1 connected 3840x1024+0+1050 (0x6b) normal (normal left inverted right x
axis y axis) 1082mm x 288mm
    Identifier: 0x58
    Timestamp:  12755
    Subpixel:   horizontal rgb
    Gamma:      1.0:1.0:1.0
    Brightness: 1.0
    Clones:    
    CRTC:       1
    CRTCs:      0 1 2 3 4 5

Only time stamp is different in the above text block.

As for as the registers for crtc 1:

Just before the watermark commit - the good case (and it is the same as
2.6.36.3):
0x0c00  0x00030002 (196610)
0x0c04  0x00000000 (0)
0x7718  0x00000000 (0)
0x771c  0x00000000 (0)
0x770c  0x00020004 (131076)

Just at the watermark commit - the bad case:
0x0c00    0x00030002 (196610)
0x0c04    0x2e985963 (781736291)
0x7718    0x00000024 (36)
0x771c    0x00000024 (36)
0x770c    0x00010005 (65541)

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