[Bug 29333] New: [r300] dual head output is *very* slow on rotated display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29333

           Summary: [r300] dual head output is *very* slow on rotated
                    display
           Product: xorg
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: entropy at everymail.net
         QAContact: xorg-team at lists.x.org


Hi all,

I'm using using libdrm, mesa [r300g] and xf86-video-ati from git.

The setup I'm facing the issue with is a Thinkpad R50p with r300 class GPU
[AGP].

When I use the internal display together with an external display [D-Sub] which
is rotated the output on the external display is *extremely* sluggish. You can
watch the screen being build up. Honestly, it takes the external screen 1-2
seconds to finish refresh. It's currently simply not possible to work in this
configuration for me.

xrandr:

Screen 0: minimum 320 x 200, current 2880 x 1200, maximum 4096 x 4096
VGA-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm
x 301mm
   1280x1024      60.0*+   75.0  
   1280x960       75.0     60.0  
   1152x864       75.0  
   1024x768       75.1     70.1     60.0                                        
   832x624        74.6                                                          
   800x600        72.2     75.0     60.3     56.2                               
   640x480        72.8     75.0     66.7     60.0                               
   720x400        70.1  
DVI-0 disconnected (normal left inverted right x axis y axis)
LVDS connected 1600x1200+1280+0 (normal left inverted right x axis y axis) 0mm
x 0mm
   1600x1200      60.0*+   60.0  
   1400x1050      60.0     60.0  
   1280x1024      59.9     60.0  
   1440x900       59.9  
   1280x960       60.0     59.9  
   1280x854       59.9  
   1280x800       59.8  
   1280x720       59.9  
   1152x768       59.8  
   1024x768       60.0     59.9  
   800x600        60.3     59.9  
   848x480        59.7  
   720x480        59.7  
   640x480        59.9     59.4  
S-video disconnected (normal left inverted right x axis y axis)

lspci:

01:00.0 VGA compatible controller: ATI Technologies Inc M10 NT [FireGL Mobility
T2] (rev 80) (prog-if 00 [VGA controller])
        Subsystem: IBM Device 054f
        Flags: bus master, fast Back2Back, 66MHz, medium devsel, latency 66,
IRQ 11
        Memory at e0000000 (32-bit, prefetchable) [size=128M]
        I/O ports at 3000 [size=256]
        Memory at c0100000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at c0120000 [disabled] [size=128K]
        Capabilities: [58] AGP version 2.0
        Capabilities: [50] Power Management version 2
        Kernel driver in use: radeon
        Kernel modules: radeon

Configuration of the displays:
 xrandr --output LVDS --mode 1600x1200 --right-of VGA-0
 xrandr --output VGA-0 --mode 1280x1024 --rotate left

Thanks in advance and keep up the excellent work!

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